CVE-2024-26616 (GCVE-0-2024-26616)

Vulnerability from cvelistv5 – Published: 2024-02-29 15:52 – Updated: 2026-05-11 20:00
VLAI
Title
btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned [BUG] There is a bug report that, on a ext4-converted btrfs, scrub leads to various problems, including: - "unable to find chunk map" errors BTRFS info (device vdb): scrub: started on devid 1 BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096 BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056 This would lead to unrepariable errors. - Use-after-free KASAN reports: ================================================================== BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0 Read of size 8 at addr ffff8881013c9040 by task btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023 Call Trace: <TASK> dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part.0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f47e5e0952b - Crash, mostly due to above use-after-free [CAUSE] The converted fs has the following data chunk layout: item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80 length 86016 owner 2 stripe_len 65536 type DATA|single For above logical bytenr 2214744064, it's at the chunk end (2214658048 + 86016 = 2214744064). This means btrfs_submit_bio() would split the bio, and trigger endio function for both of the two halves. However scrub_submit_initial_read() would only expect the endio function to be called once, not any more. This means the first endio function would already free the bbio::bio, leaving the bvec freed, thus the 2nd endio call would lead to use-after-free. [FIX] - Make sure scrub_read_endio() only updates bits in its range Since we may read less than 64K at the end of the chunk, we should not touch the bits beyond chunk boundary. - Make sure scrub_submit_initial_read() only to read the chunk range This is done by calculating the real number of sectors we need to read, and add sector-by-sector to the bio. Thankfully the scrub read repair path won't need extra fixes: - scrub_stripe_submit_repair_read() With above fixes, we won't update error bit for range beyond chunk, thus scrub_stripe_submit_repair_read() should never submit any read beyond the chunk.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:57 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e02ee89baa66c40e1002cf8b09141fce7265e0f5 , < 642b9c520ef2f104277ad1f902f8526edbe087fb (git)
Affected: e02ee89baa66c40e1002cf8b09141fce7265e0f5 , < 34de0f04684ec00c093a0455648be055f0e8e24f (git)
Affected: e02ee89baa66c40e1002cf8b09141fce7265e0f5 , < f546c4282673497a06ecb6190b50ae7f6c85b02f (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.15 , ≤ 6.6.* (semver)
Unaffected: 6.7.3 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T00:07:19.788Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-26616",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:57:14.247460Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:33:49.394Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/scrub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "642b9c520ef2f104277ad1f902f8526edbe087fb",
              "status": "affected",
              "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
              "versionType": "git"
            },
            {
              "lessThan": "34de0f04684ec00c093a0455648be055f0e8e24f",
              "status": "affected",
              "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
              "versionType": "git"
            },
            {
              "lessThan": "f546c4282673497a06ecb6190b50ae7f6c85b02f",
              "status": "affected",
              "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/scrub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.15",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.15",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.7.3",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.8",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n  BTRFS info (device vdb): scrub: started on devid 1\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n  This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x43/0x60\n   print_report+0xcf/0x640\n   kasan_report+0xa6/0xd0\n   __blk_rq_map_sg+0x18f/0x7c0\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   blk_mq_flush_plug_list.part.0+0x780/0x860\n   __blk_flush_plug+0x1ba/0x220\n   blk_finish_plug+0x3b/0x60\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   __x64_sys_ioctl+0xbd/0x100\n   do_syscall_64+0x5d/0xe0\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n        length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n  Since we may read less than 64K at the end of the chunk, we should not\n  touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n  This is done by calculating the real number of sectors we need to\n  read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won\u0027t need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\n  thus scrub_stripe_submit_repair_read() should never submit any read\n  beyond the chunk."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T20:00:50.930Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
        }
      ],
      "title": "btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26616",
    "datePublished": "2024-02-29T15:52:19.452Z",
    "dateReserved": "2024-02-19T14:20:24.131Z",
    "dateUpdated": "2026-05-11T20:00:50.930Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-26616",
      "date": "2026-10-02",
      "epss": "0.00291",
      "percentile": "0.19689"
    },
    "fkie_nvd": {
      "configurations": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "D6633E78-36B1-447E-BE57-C820A3E58E33",
                  "versionEndExcluding": "6.6.15",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "58FD5308-148A-40D3-B36A-0CA6B434A8BF",
                  "versionEndExcluding": "6.7.3",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*",
                  "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n  BTRFS info (device vdb): scrub: started on devid 1\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n  This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x43/0x60\n   print_report+0xcf/0x640\n   kasan_report+0xa6/0xd0\n   __blk_rq_map_sg+0x18f/0x7c0\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   blk_mq_flush_plug_list.part.0+0x780/0x860\n   __blk_flush_plug+0x1ba/0x220\n   blk_finish_plug+0x3b/0x60\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   __x64_sys_ioctl+0xbd/0x100\n   do_syscall_64+0x5d/0xe0\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n        length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n  Since we may read less than 64K at the end of the chunk, we should not\n  touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n  This is done by calculating the real number of sectors we need to\n  read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won\u0027t need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\n  thus scrub_stripe_submit_repair_read() should never submit any read\n  beyond the chunk."
        },
        {
          "lang": "es",
          "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: limpieza: evita el use-after-free cuando la longitud del fragmento no est\u00e1 alineada con 64 K [ERROR] Hay un informe de error que indica que, en un btrfs convertido a ext4, la limpieza conduce a varios problemas, que incluyen: - Errores \"no se puede encontrar el mapa de fragmentos\" Informaci\u00f3n BTRFS (dispositivo vdb): limpieza: iniciado en el devid 1 BTRFS cr\u00edtico (dispositivo vdb): no se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 4096 BTRFS cr\u00edtico (dispositivo vdb): No se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 45056. Esto provocar\u00eda errores irreparables. - Informes KASAN de uso gratuito: =========================================== ========================= ERROR: KASAN: slab-use-after-free en __blk_rq_map_sg+0x18f/0x7c0 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881013c9040 por tarea btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Nombre de hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 2023.11-2 24/12/2023 Seguimiento de llamadas :  dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02ed fad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part. 0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Flush_scrub_stripes+0x38 e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_chunk+0x178/0x200 [btrfs e579 87a360cama82fe8756dcd3e0de5406ccfe965 ] Scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btr fs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 Entry_SYSCALL_64_after_hwframe+0x63/0x6b QEPD: 0033:0x7f47e5e0952b - Fallo , principalmente debido al use-after-free anterior [CAUSA] El fs convertido tiene el siguiente dise\u00f1o de fragmento de datos: clave del elemento 2 (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 tama\u00f1o del elemento 80 longitud 86016 propietario 2 stripe_len 65536 tipo DATOS|single Para el bytenr l\u00f3gico anterior 2214744064 , est\u00e1 al final del fragmento (2214658048 + 86016 = 2214744064). Esto significa que btrfs_submit_bio() dividir\u00eda la biograf\u00eda y activar\u00eda la funci\u00f3n endio para ambas mitades. Sin embargo, Scrub_submit_initial_read() solo esperar\u00eda que la funci\u00f3n endio se llamara una vez, ya no. Esto significa que la primera funci\u00f3n endio ya liberar\u00eda bbio::bio, dejando libre el bvec, por lo que la segunda llamada a endio conducir\u00eda a use-after-free. [FIX] - Aseg\u00farese de que Scrub_read_endio() solo actualice los bits en su rango. Dado que podemos leer menos de 64 K al final del fragmento, no debemos tocar los bits m\u00e1s all\u00e1 del l\u00edmite del fragmento. - Aseg\u00farese de que Scrub_submit_initial_read() solo lea el rango de fragmentos. Esto se hace calculando el n\u00famero real de sectores que necesitamos leer y agregando sector por sector a la biograf\u00eda. Afortunadamente, la ruta de reparaci\u00f3n de lectura de limpieza no necesitar\u00e1 correcciones adicionales: - Scrub_stripe_submit_repair_read() Con las correcciones anteriores, no actualizaremos el bit de error para el rango m\u00e1s all\u00e1 del fragmento, por lo tanto, Scrub_stripe_submit_repair_read() nunca deber\u00eda enviar ninguna lectura m\u00e1s all\u00e1 del fragmento."
        }
      ],
      "id": "CVE-2024-26616",
      "lastModified": "2024-12-12T15:31:18.293",
      "metrics": {
        "cvssMetricV31": [
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            },
            "exploitabilityScore": 1.8,
            "impactScore": 5.9,
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      },
      "published": "2024-03-11T18:15:19.400",
      "references": [
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
        },
        {
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Patch"
          ],
          "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
        }
      ],
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-416"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "fs/btrfs/scrub.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "642b9c520ef2f104277ad1f902f8526edbe087fb",
                    "status": "affected",
                    "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "34de0f04684ec00c093a0455648be055f0e8e24f",
                    "status": "affected",
                    "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f546c4282673497a06ecb6190b50ae7f6c85b02f",
                    "status": "affected",
                    "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "fs/btrfs/scrub.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.4"
                  },
                  {
                    "lessThan": "6.4",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.15",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.7.*",
                    "status": "unaffected",
                    "version": "6.7.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.8",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "D6633E78-36B1-447E-BE57-C820A3E58E33",
                    "versionEndExcluding": "6.6.15",
                    "versionStartIncluding": "6.4",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "58FD5308-148A-40D3-B36A-0CA6B434A8BF",
                    "versionEndExcluding": "6.7.3",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "B9F4EA73-0894-400F-A490-3A397AB7A517",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n  BTRFS info (device vdb): scrub: started on devid 1\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n  This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x43/0x60\n   print_report+0xcf/0x640\n   kasan_report+0xa6/0xd0\n   __blk_rq_map_sg+0x18f/0x7c0\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   blk_mq_flush_plug_list.part.0+0x780/0x860\n   __blk_flush_plug+0x1ba/0x220\n   blk_finish_plug+0x3b/0x60\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   __x64_sys_ioctl+0xbd/0x100\n   do_syscall_64+0x5d/0xe0\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n        length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n  Since we may read less than 64K at the end of the chunk, we should not\n  touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n  This is done by calculating the real number of sectors we need to\n  read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won\u0027t need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\n  thus scrub_stripe_submit_repair_read() should never submit any read\n  beyond the chunk."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: limpieza: evita el use-after-free cuando la longitud del fragmento no est\u00e1 alineada con 64 K [ERROR] Hay un informe de error que indica que, en un btrfs convertido a ext4, la limpieza conduce a varios problemas, que incluyen: - Errores \"no se puede encontrar el mapa de fragmentos\" Informaci\u00f3n BTRFS (dispositivo vdb): limpieza: iniciado en el devid 1 BTRFS cr\u00edtico (dispositivo vdb): no se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 4096 BTRFS cr\u00edtico (dispositivo vdb): No se puede encontrar el mapa de fragmentos para la longitud l\u00f3gica 2214744064 45056. Esto provocar\u00eda errores irreparables. - Informes KASAN de uso gratuito: =========================================== ========================= ERROR: KASAN: slab-use-after-free en __blk_rq_map_sg+0x18f/0x7c0 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff8881013c9040 por tarea btrfs/909 CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b Nombre de hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS 2023.11-2 24/12/2023 Seguimiento de llamadas :  dump_stack_lvl+0x43/0x60 print_report+0xcf/0x640 kasan_report+0xa6/0xd0 __blk_rq_map_sg+0x18f/0x7c0 virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02ed fad39bb9ddee07dcdaff] virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff] blk_mq_flush_plug_list.part. 0+0x780/0x860 __blk_flush_plug+0x1ba/0x220 blk_finish_plug+0x3b/0x60 submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Flush_scrub_stripes+0x38 e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] Scrub_chunk+0x178/0x200 [btrfs e579 87a360cama82fe8756dcd3e0de5406ccfe965 ] Scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] btr fs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965] __x64_sys_ioctl+0xbd/0x100 do_syscall_64+0x5d/0xe0 Entry_SYSCALL_64_after_hwframe+0x63/0x6b QEPD: 0033:0x7f47e5e0952b - Fallo , principalmente debido al use-after-free anterior [CAUSA] El fs convertido tiene el siguiente dise\u00f1o de fragmento de datos: clave del elemento 2 (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 tama\u00f1o del elemento 80 longitud 86016 propietario 2 stripe_len 65536 tipo DATOS|single Para el bytenr l\u00f3gico anterior 2214744064 , est\u00e1 al final del fragmento (2214658048 + 86016 = 2214744064). Esto significa que btrfs_submit_bio() dividir\u00eda la biograf\u00eda y activar\u00eda la funci\u00f3n endio para ambas mitades. Sin embargo, Scrub_submit_initial_read() solo esperar\u00eda que la funci\u00f3n endio se llamara una vez, ya no. Esto significa que la primera funci\u00f3n endio ya liberar\u00eda bbio::bio, dejando libre el bvec, por lo que la segunda llamada a endio conducir\u00eda a use-after-free. [FIX] - Aseg\u00farese de que Scrub_read_endio() solo actualice los bits en su rango. Dado que podemos leer menos de 64 K al final del fragmento, no debemos tocar los bits m\u00e1s all\u00e1 del l\u00edmite del fragmento. - Aseg\u00farese de que Scrub_submit_initial_read() solo lea el rango de fragmentos. Esto se hace calculando el n\u00famero real de sectores que necesitamos leer y agregando sector por sector a la biograf\u00eda. Afortunadamente, la ruta de reparaci\u00f3n de lectura de limpieza no necesitar\u00e1 correcciones adicionales: - Scrub_stripe_submit_repair_read() Con las correcciones anteriores, no actualizaremos el bit de error para el rango m\u00e1s all\u00e1 del fragmento, por lo tanto, Scrub_stripe_submit_repair_read() nunca deber\u00eda enviar ninguna lectura m\u00e1s all\u00e1 del fragmento."
          }
        ],
        "id": "CVE-2024-26616",
        "lastModified": "2026-06-17T07:17:54.237",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-26616",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:57:14.247460Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-03-11T18:15:19.400",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T11:32:11+00:00",
      "cve": "CVE-2024-26616",
      "id": "CVE-2024-26616",
      "initial_release_date": "2024-02-29T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26616.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-22T01:48:44Z",
      "cve": "CVE-2024-26616",
      "id": "CVE-2024-26616",
      "initial_release_date": "2024-03-06T04:33:02Z",
      "product_status:known_not_affected": "292",
      "product_status:recommended": "231",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26616",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26616.json",
      "version": "35"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-02T00:07:19.788Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-26616",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:57:14.247460Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:18.955Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "fs/btrfs/scrub.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "642b9c520ef2f104277ad1f902f8526edbe087fb",
                  "status": "affected",
                  "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
                  "versionType": "git"
                },
                {
                  "lessThan": "34de0f04684ec00c093a0455648be055f0e8e24f",
                  "status": "affected",
                  "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
                  "versionType": "git"
                },
                {
                  "lessThan": "f546c4282673497a06ecb6190b50ae7f6c85b02f",
                  "status": "affected",
                  "version": "e02ee89baa66c40e1002cf8b09141fce7265e0f5",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "fs/btrfs/scrub.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.4"
                },
                {
                  "lessThan": "6.4",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.15",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.7.*",
                  "status": "unaffected",
                  "version": "6.7.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.8",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.15",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.7.3",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.8",
                      "versionStartIncluding": "6.4",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: scrub: avoid use-after-free when chunk length is not 64K aligned\n\n[BUG]\nThere is a bug report that, on a ext4-converted btrfs, scrub leads to\nvarious problems, including:\n\n- \"unable to find chunk map\" errors\n  BTRFS info (device vdb): scrub: started on devid 1\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 4096\n  BTRFS critical (device vdb): unable to find chunk map for logical 2214744064 length 45056\n\n  This would lead to unrepariable errors.\n\n- Use-after-free KASAN reports:\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in __blk_rq_map_sg+0x18f/0x7c0\n  Read of size 8 at addr ffff8881013c9040 by task btrfs/909\n  CPU: 0 PID: 909 Comm: btrfs Not tainted 6.7.0-x64v3-dbg #11 c50636e9419a8354555555245df535e380563b2b\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-2 12/24/2023\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x43/0x60\n   print_report+0xcf/0x640\n   kasan_report+0xa6/0xd0\n   __blk_rq_map_sg+0x18f/0x7c0\n   virtblk_prep_rq.isra.0+0x215/0x6a0 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   virtio_queue_rqs+0xc4/0x310 [virtio_blk 19a65eeee9ae6fcf02edfad39bb9ddee07dcdaff]\n   blk_mq_flush_plug_list.part.0+0x780/0x860\n   __blk_flush_plug+0x1ba/0x220\n   blk_finish_plug+0x3b/0x60\n   submit_initial_group_read+0x10a/0x290 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   flush_scrub_stripes+0x38e/0x430 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_stripe+0x82a/0xae0 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_chunk+0x178/0x200 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   scrub_enumerate_chunks+0x4bc/0xa30 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_scrub_dev+0x398/0x810 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   btrfs_ioctl+0x4b9/0x3020 [btrfs e57987a360bed82fe8756dcd3e0de5406ccfe965]\n   __x64_sys_ioctl+0xbd/0x100\n   do_syscall_64+0x5d/0xe0\n   entry_SYSCALL_64_after_hwframe+0x63/0x6b\n  RIP: 0033:0x7f47e5e0952b\n\n- Crash, mostly due to above use-after-free\n\n[CAUSE]\nThe converted fs has the following data chunk layout:\n\n    item 2 key (FIRST_CHUNK_TREE CHUNK_ITEM 2214658048) itemoff 16025 itemsize 80\n        length 86016 owner 2 stripe_len 65536 type DATA|single\n\nFor above logical bytenr 2214744064, it\u0027s at the chunk end\n(2214658048 + 86016 = 2214744064).\n\nThis means btrfs_submit_bio() would split the bio, and trigger endio\nfunction for both of the two halves.\n\nHowever scrub_submit_initial_read() would only expect the endio function\nto be called once, not any more.\nThis means the first endio function would already free the bbio::bio,\nleaving the bvec freed, thus the 2nd endio call would lead to\nuse-after-free.\n\n[FIX]\n- Make sure scrub_read_endio() only updates bits in its range\n  Since we may read less than 64K at the end of the chunk, we should not\n  touch the bits beyond chunk boundary.\n\n- Make sure scrub_submit_initial_read() only to read the chunk range\n  This is done by calculating the real number of sectors we need to\n  read, and add sector-by-sector to the bio.\n\nThankfully the scrub read repair path won\u0027t need extra fixes:\n\n- scrub_stripe_submit_repair_read()\n  With above fixes, we won\u0027t update error bit for range beyond chunk,\n  thus scrub_stripe_submit_repair_read() should never submit any read\n  beyond the chunk."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:00:50.930Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/642b9c520ef2f104277ad1f902f8526edbe087fb"
            },
            {
              "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
            },
            {
              "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
            }
          ],
          "title": "btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26616",
        "datePublished": "2024-02-29T15:52:19.452Z",
        "dateReserved": "2024-02-19T14:20:24.131Z",
        "dateUpdated": "2026-05-11T20:00:50.930Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.