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)
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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.
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          "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": [
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            "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"
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                  "type": "ssvc"
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              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:18.955Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
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              "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": [
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                  "status": "affected",
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                  "versionType": "git"
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                  "status": "affected",
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              "product": "Linux",
              "programFiles": [
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              ],
              "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"
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          ],
          "cpeApplicability": [
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              "nodes": [
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                  "cpeMatch": [
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                      "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",
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                  ],
                  "negate": false,
                  "operator": "OR"
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          ],
          "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."
            }
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          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:00:50.930Z",
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          "references": [
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            {
              "url": "https://git.kernel.org/stable/c/34de0f04684ec00c093a0455648be055f0e8e24f"
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            {
              "url": "https://git.kernel.org/stable/c/f546c4282673497a06ecb6190b50ae7f6c85b02f"
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          "title": "btrfs: scrub: avoid use-after-free when chunk length is not 64K aligned",
          "x_generator": {
            "engine": "bippy-1.2.0"
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      "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"
    }
  }
}



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