Vulnerability-Lookup

FKIE_CVE-2024-26868

Vulnerability from fkie_nvd - Published: 2024-04-17 11:15 - Updated: 2026-08-04 11:17

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: nfs: fix panic when nfs4_ff_layout_prepare_ds() fails We've been seeing the following panic in production BUG: kernel NULL pointer dereference, address: 0000000000000065 PGD 2f485f067 P4D 2f485f067 PUD 2cc5d8067 PMD 0 RIP: 0010:ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles] Call Trace: <TASK> ? __die+0x78/0xc0 ? page_fault_oops+0x286/0x380 ? __rpc_execute+0x2c3/0x470 [sunrpc] ? rpc_new_task+0x42/0x1c0 [sunrpc] ? exc_page_fault+0x5d/0x110 ? asm_exc_page_fault+0x22/0x30 ? ff_layout_free_layoutreturn+0x110/0x110 [nfs_layout_flexfiles] ? ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles] ? ff_layout_cancel_io+0x6f/0x90 [nfs_layout_flexfiles] pnfs_mark_matching_lsegs_return+0x1b0/0x360 [nfsv4] pnfs_error_mark_layout_for_return+0x9e/0x110 [nfsv4] ? ff_layout_send_layouterror+0x50/0x160 [nfs_layout_flexfiles] nfs4_ff_layout_prepare_ds+0x11f/0x290 [nfs_layout_flexfiles] ff_layout_pg_init_write+0xf0/0x1f0 [nfs_layout_flexfiles] __nfs_pageio_add_request+0x154/0x6c0 [nfs] nfs_pageio_add_request+0x26b/0x380 [nfs] nfs_do_writepage+0x111/0x1e0 [nfs] nfs_writepages_callback+0xf/0x30 [nfs] write_cache_pages+0x17f/0x380 ? nfs_pageio_init_write+0x50/0x50 [nfs] ? nfs_writepages+0x6d/0x210 [nfs] ? nfs_writepages+0x6d/0x210 [nfs] nfs_writepages+0x125/0x210 [nfs] do_writepages+0x67/0x220 ? generic_perform_write+0x14b/0x210 filemap_fdatawrite_wbc+0x5b/0x80 file_write_and_wait_range+0x6d/0xc0 nfs_file_fsync+0x81/0x170 [nfs] ? nfs_file_mmap+0x60/0x60 [nfs] __x64_sys_fsync+0x53/0x90 do_syscall_64+0x3d/0x90 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Inspecting the core with drgn I was able to pull this >>> prog.crashed_thread().stack_trace()[0] #0 at 0xffffffffa079657a (ff_layout_cancel_io+0x3a/0x84) in ff_layout_cancel_io at fs/nfs/flexfilelayout/flexfilelayout.c:2021:27 >>> prog.crashed_thread().stack_trace()[0]['idx'] (u32)1 >>> prog.crashed_thread().stack_trace()[0]['flseg'].mirror_array[1].mirror_ds (struct nfs4_ff_layout_ds *)0xffffffffffffffed This is clear from the stack trace, we call nfs4_ff_layout_prepare_ds() which could error out initializing the mirror_ds, and then we go to clean it all up and our check is only for if (!mirror->mirror_ds). This is inconsistent with the rest of the users of mirror_ds, which have if (IS_ERR_OR_NULL(mirror_ds)) to keep from tripping over this exact scenario. Fix this up in ff_layout_cancel_io() to make sure we don't panic when we get an error. I also spot checked all the other instances of checking mirror_ds and we appear to be doing the correct checks everywhere, only unconditionally dereferencing mirror_ds when we know it would be valid.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/31db25e3141b20e2a76a9f219eeca52e3cab126c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5ada9016b1217498fad876a3d5b07645cc955608	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/719fcafe07c12646691bd62d7f8d94d657fa0766	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/dac068f164ad05b35e7c0be13f138c3f6adca58f	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/31db25e3141b20e2a76a9f219eeca52e3cab126c	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/5ada9016b1217498fad876a3d5b07645cc955608	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/719fcafe07c12646691bd62d7f8d94d657fa0766	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/dac068f164ad05b35e7c0be13f138c3f6adca58f	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/flexfilelayout/flexfilelayout.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "31db25e3141b20e2a76a9f219eeca52e3cab126c",
              "status": "affected",
              "version": "b739a5bd9d9f18cc69dced8db128ef7206e000cd",
              "versionType": "git"
            },
            {
              "lessThan": "7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5",
              "status": "affected",
              "version": "b739a5bd9d9f18cc69dced8db128ef7206e000cd",
              "versionType": "git"
            },
            {
              "lessThan": "5ada9016b1217498fad876a3d5b07645cc955608",
              "status": "affected",
              "version": "b739a5bd9d9f18cc69dced8db128ef7206e000cd",
              "versionType": "git"
            },
            {
              "lessThan": "dac068f164ad05b35e7c0be13f138c3f6adca58f",
              "status": "affected",
              "version": "b739a5bd9d9f18cc69dced8db128ef7206e000cd",
              "versionType": "git"
            },
            {
              "lessThan": "719fcafe07c12646691bd62d7f8d94d657fa0766",
              "status": "affected",
              "version": "b739a5bd9d9f18cc69dced8db128ef7206e000cd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/flexfilelayout/flexfilelayout.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.23",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.8.*",
              "status": "unaffected",
              "version": "6.8.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.9",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "3057E4AB-0FB4-49B3-B63D-10D187B96B1B",
              "versionEndExcluding": "6.1.83",
              "versionStartIncluding": "6.1",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E00814DC-0BA7-431A-9926-80FEB4A96C68",
              "versionEndExcluding": "6.6.23",
              "versionStartIncluding": "6.2",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "9B95D3A6-E162-47D5-ABFC-F3FA74FA7CFD",
              "versionEndExcluding": "6.7.11",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "543A75FF-25B8-4046-A514-1EA8EDD87AB1",
              "versionEndExcluding": "6.8.2",
              "versionStartIncluding": "6.8",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs: fix panic when nfs4_ff_layout_prepare_ds() fails\n\nWe\u0027ve been seeing the following panic in production\n\nBUG: kernel NULL pointer dereference, address: 0000000000000065\nPGD 2f485f067 P4D 2f485f067 PUD 2cc5d8067 PMD 0\nRIP: 0010:ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles]\nCall Trace:\n \u003cTASK\u003e\n ? __die+0x78/0xc0\n ? page_fault_oops+0x286/0x380\n ? __rpc_execute+0x2c3/0x470 [sunrpc]\n ? rpc_new_task+0x42/0x1c0 [sunrpc]\n ? exc_page_fault+0x5d/0x110\n ? asm_exc_page_fault+0x22/0x30\n ? ff_layout_free_layoutreturn+0x110/0x110 [nfs_layout_flexfiles]\n ? ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles]\n ? ff_layout_cancel_io+0x6f/0x90 [nfs_layout_flexfiles]\n pnfs_mark_matching_lsegs_return+0x1b0/0x360 [nfsv4]\n pnfs_error_mark_layout_for_return+0x9e/0x110 [nfsv4]\n ? ff_layout_send_layouterror+0x50/0x160 [nfs_layout_flexfiles]\n nfs4_ff_layout_prepare_ds+0x11f/0x290 [nfs_layout_flexfiles]\n ff_layout_pg_init_write+0xf0/0x1f0 [nfs_layout_flexfiles]\n __nfs_pageio_add_request+0x154/0x6c0 [nfs]\n nfs_pageio_add_request+0x26b/0x380 [nfs]\n nfs_do_writepage+0x111/0x1e0 [nfs]\n nfs_writepages_callback+0xf/0x30 [nfs]\n write_cache_pages+0x17f/0x380\n ? nfs_pageio_init_write+0x50/0x50 [nfs]\n ? nfs_writepages+0x6d/0x210 [nfs]\n ? nfs_writepages+0x6d/0x210 [nfs]\n nfs_writepages+0x125/0x210 [nfs]\n do_writepages+0x67/0x220\n ? generic_perform_write+0x14b/0x210\n filemap_fdatawrite_wbc+0x5b/0x80\n file_write_and_wait_range+0x6d/0xc0\n nfs_file_fsync+0x81/0x170 [nfs]\n ? nfs_file_mmap+0x60/0x60 [nfs]\n __x64_sys_fsync+0x53/0x90\n do_syscall_64+0x3d/0x90\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nInspecting the core with drgn I was able to pull this\n\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0]\n  #0 at 0xffffffffa079657a (ff_layout_cancel_io+0x3a/0x84) in ff_layout_cancel_io at fs/nfs/flexfilelayout/flexfilelayout.c:2021:27\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0][\u0027idx\u0027]\n  (u32)1\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0][\u0027flseg\u0027].mirror_array[1].mirror_ds\n  (struct nfs4_ff_layout_ds *)0xffffffffffffffed\n\nThis is clear from the stack trace, we call nfs4_ff_layout_prepare_ds()\nwhich could error out initializing the mirror_ds, and then we go to\nclean it all up and our check is only for if (!mirror-\u003emirror_ds).  This\nis inconsistent with the rest of the users of mirror_ds, which have\n\n  if (IS_ERR_OR_NULL(mirror_ds))\n\nto keep from tripping over this exact scenario.  Fix this up in\nff_layout_cancel_io() to make sure we don\u0027t panic when we get an error.\nI also spot checked all the other instances of checking mirror_ds and we\nappear to be doing the correct checks everywhere, only unconditionally\ndereferencing mirror_ds when we know it would be valid."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfs: soluciona el p\u00e1nico cuando falla nfs4_ff_layout_prepare_ds() Hemos estado viendo el siguiente error de p\u00e1nico en producci\u00f3n: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000065 PGD 2f485f067 P4D 2f485f067 PUD 2cc5d8067 PMD RIP : 0010:ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles] Seguimiento de llamadas: ? __die+0x78/0xc0 ? page_fault_oops+0x286/0x380? __rpc_execute+0x2c3/0x470 [sunrpc] ? rpc_new_task+0x42/0x1c0 [sunrpc] ? exc_page_fault+0x5d/0x110? asm_exc_page_fault+0x22/0x30? ff_layout_free_layoutreturn+0x110/0x110 [nfs_layout_flexfiles]? ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles]? ff_layout_cancel_io+0x6f/0x90 [nfs_layout_flexfiles] pnfs_mark_matching_lsegs_return+0x1b0/0x360 [nfsv4] pnfs_error_mark_layout_for_return+0x9e/0x110 [nfsv4] ? ff_layout_send_layouterror+0x50/0x160 [nfs_layout_flexfiles] nfs4_ff_layout_prepare_ds+0x11f/0x290 [nfs_layout_flexfiles] ff_layout_pg_init_write+0xf0/0x1f0 [nfs_layout_flexfiles] __nfs_pageio_add_re b\u00fasqueda+0x154/0x6c0 [nfs] nfs_pageio_add_request+0x26b/0x380 [nfs] nfs_do_writepage+0x111/0x1e0 [nfs] nfs_writepages_callback+ 0xf/0x30 [nfs] write_cache_pages+0x17f/0x380 ? nfs_pageio_init_write+0x50/0x50 [nfs] ? nfs_writepages+0x6d/0x210 [nfs]? nfs_writepages+0x6d/0x210 [nfs] nfs_writepages+0x125/0x210 [nfs] do_writepages+0x67/0x220? generic_perform_write+0x14b/0x210 filemap_fdatawrite_wbc+0x5b/0x80 file_write_and_wait_range+0x6d/0xc0 nfs_file_fsync+0x81/0x170 [nfs] ? nfs_file_mmap+0x60/0x60 [nfs] __x64_sys_fsync+0x53/0x90 do_syscall_64+0x3d/0x90 Entry_SYSCALL_64_after_hwframe+0x46/0xb0 Inspeccionando el n\u00facleo con drgn pude extraer esto \u0026gt;\u0026gt;\u0026gt; prog.crashed_thread().stack_trace()[0 ] # 0 en 0xffffffffa079657a (ff_layout_cancel_io+0x3a/0x84) en ff_layout_cancel_io en fs/nfs/flexfilelayout/flexfilelayout.c:2021:27 \u0026gt;\u0026gt;\u0026gt; prog.crashed_thread().stack_trace()[0][\u0027idx\u0027] (u32)1 \u0026gt;\u0026gt;\u0026gt; prog.crashed_thread().stack_trace()[0][\u0027flseg\u0027].mirror_array[1].mirror_ds (struct nfs4_ff_layout_ds *)0xffffffffffffffed Esto queda claro en el seguimiento de la pila, llamamos a nfs4_ff_layout_prepare_ds(), lo que podr\u00eda generar un error inicializando mirror_ds, y luego vamos a limpiarlo todo y nuestra verificaci\u00f3n es solo para if (!mirror-\u0026gt;mirror_ds). Esto es inconsistente con el resto de usuarios de mirror_ds, que tienen if (IS_ERR_OR_NULL(mirror_ds)) para evitar tropezar con este escenario exacto. Solucione esto en ff_layout_cancel_io() para asegurarnos de que no entremos en p\u00e1nico cuando recibamos un error. Tambi\u00e9n revis\u00e9 todas las dem\u00e1s instancias de verificaci\u00f3n de mirror_ds y parece que estamos haciendo las verificaciones correctas en todas partes, solo desreferenciando incondicionalmente mirror_ds cuando sabemos que ser\u00eda v\u00e1lido."
    }
  ],
  "id": "CVE-2024-26868",
  "lastModified": "2026-08-04T11:17:15.173",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-26868",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-05-28T19:56:48.883135Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-04-17T11:15:09.360",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/31db25e3141b20e2a76a9f219eeca52e3cab126c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5ada9016b1217498fad876a3d5b07645cc955608"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/719fcafe07c12646691bd62d7f8d94d657fa0766"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/dac068f164ad05b35e7c0be13f138c3f6adca58f"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/31db25e3141b20e2a76a9f219eeca52e3cab126c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5ada9016b1217498fad876a3d5b07645cc955608"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/719fcafe07c12646691bd62d7f8d94d657fa0766"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/dac068f164ad05b35e7c0be13f138c3f6adca58f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2024-26868 (GCVE-0-2024-26868)

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-08-05 11:27

Title

nfs: fix panic when nfs4_ff_layout_prepare_ds() fails

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-28 19:56 UTC

Assigner

Linux mitre root Scorecard

References

5 references

URL	Tags
https://git.kernel.org/stable/c/31db25e3141b20e2a…
https://git.kernel.org/stable/c/7ca651b4ec4a049f5…
https://git.kernel.org/stable/c/5ada9016b1217498f…
https://git.kernel.org/stable/c/dac068f164ad05b35…
https://git.kernel.org/stable/c/719fcafe07c126466…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 31db25e3141b20e2a76a9f219eeca52e3cab126c (git) Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5 (git) Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 5ada9016b1217498fad876a3d5b07645cc955608 (git) Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < dac068f164ad05b35e7c0be13f138c3f6adca58f (git) Affected: b739a5bd9d9f18cc69dced8db128ef7206e000cd , < 719fcafe07c12646691bd62d7f8d94d657fa0766 (git)
Linux	Linux	Affected: 6.1 Unaffected: 0 , < 6.1 (semver) Unaffected: 6.1.83 , ≤ 6.1.* (semver) Unaffected: 6.6.23 , ≤ 6.6.* (semver) Unaffected: 6.7.11 , ≤ 6.7.* (semver) Unaffected: 6.8.2 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix)

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{
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                "id": "CVE-2024-26868",
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                "role": "CISA Coordinator",
                "timestamp": "2024-05-28T19:56:48.883135Z",
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              "version": "6.1.83",
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              "version": "6.6.23",
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              "status": "unaffected",
              "version": "6.8.2",
              "versionType": "semver"
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              "status": "unaffected",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs: fix panic when nfs4_ff_layout_prepare_ds() fails\n\nWe\u0027ve been seeing the following panic in production\n\nBUG: kernel NULL pointer dereference, address: 0000000000000065\nPGD 2f485f067 P4D 2f485f067 PUD 2cc5d8067 PMD 0\nRIP: 0010:ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles]\nCall Trace:\n \u003cTASK\u003e\n ? __die+0x78/0xc0\n ? page_fault_oops+0x286/0x380\n ? __rpc_execute+0x2c3/0x470 [sunrpc]\n ? rpc_new_task+0x42/0x1c0 [sunrpc]\n ? exc_page_fault+0x5d/0x110\n ? asm_exc_page_fault+0x22/0x30\n ? ff_layout_free_layoutreturn+0x110/0x110 [nfs_layout_flexfiles]\n ? ff_layout_cancel_io+0x3a/0x90 [nfs_layout_flexfiles]\n ? ff_layout_cancel_io+0x6f/0x90 [nfs_layout_flexfiles]\n pnfs_mark_matching_lsegs_return+0x1b0/0x360 [nfsv4]\n pnfs_error_mark_layout_for_return+0x9e/0x110 [nfsv4]\n ? ff_layout_send_layouterror+0x50/0x160 [nfs_layout_flexfiles]\n nfs4_ff_layout_prepare_ds+0x11f/0x290 [nfs_layout_flexfiles]\n ff_layout_pg_init_write+0xf0/0x1f0 [nfs_layout_flexfiles]\n __nfs_pageio_add_request+0x154/0x6c0 [nfs]\n nfs_pageio_add_request+0x26b/0x380 [nfs]\n nfs_do_writepage+0x111/0x1e0 [nfs]\n nfs_writepages_callback+0xf/0x30 [nfs]\n write_cache_pages+0x17f/0x380\n ? nfs_pageio_init_write+0x50/0x50 [nfs]\n ? nfs_writepages+0x6d/0x210 [nfs]\n ? nfs_writepages+0x6d/0x210 [nfs]\n nfs_writepages+0x125/0x210 [nfs]\n do_writepages+0x67/0x220\n ? generic_perform_write+0x14b/0x210\n filemap_fdatawrite_wbc+0x5b/0x80\n file_write_and_wait_range+0x6d/0xc0\n nfs_file_fsync+0x81/0x170 [nfs]\n ? nfs_file_mmap+0x60/0x60 [nfs]\n __x64_sys_fsync+0x53/0x90\n do_syscall_64+0x3d/0x90\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nInspecting the core with drgn I was able to pull this\n\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0]\n  #0 at 0xffffffffa079657a (ff_layout_cancel_io+0x3a/0x84) in ff_layout_cancel_io at fs/nfs/flexfilelayout/flexfilelayout.c:2021:27\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0][\u0027idx\u0027]\n  (u32)1\n  \u003e\u003e\u003e prog.crashed_thread().stack_trace()[0][\u0027flseg\u0027].mirror_array[1].mirror_ds\n  (struct nfs4_ff_layout_ds *)0xffffffffffffffed\n\nThis is clear from the stack trace, we call nfs4_ff_layout_prepare_ds()\nwhich could error out initializing the mirror_ds, and then we go to\nclean it all up and our check is only for if (!mirror-\u003emirror_ds).  This\nis inconsistent with the rest of the users of mirror_ds, which have\n\n  if (IS_ERR_OR_NULL(mirror_ds))\n\nto keep from tripping over this exact scenario.  Fix this up in\nff_layout_cancel_io() to make sure we don\u0027t panic when we get an error.\nI also spot checked all the other instances of checking mirror_ds and we\nappear to be doing the correct checks everywhere, only unconditionally\ndereferencing mirror_ds when we know it would be valid."
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code path is driven entirely by data from the remote NFS server \u2014 a malicious, compromised, or spoofed NFSv4.1/4.2 server forces GETDEVICEINFO to fail (error reply, malformed XDR, or no usable DS addresses), which is what plants the ERR_PTR that is later dereferenced. The NFS client processes this attacker-controlled protocol data over the network with no locality restriction.\nAC:L - The server-side attacker fully and deterministically controls the trigger: grant a flexfiles layout, then fail the GETDEVICEINFO for one of its device IDs, and the very next write/fsync on that inode panics the client. No race, no memory-layout grooming, and the flexfiles layout driver is present in default distro NFSv4.1 configurations.\nPR:N - The attacker acts as the NFS server (or an RPC-reply injector on the path) and needs no credentials or account on the victim client. Even in the purely local framing, any unprivileged user with write access to a file on the mount reaches nfs_writepages()\u2192ff_layout_pg_init_write(), so no elevated privileges are required in any scenario.\nUI:N - No victim action is needed at exploit time \u2014 the mount is pre-existing infrastructure, and normal background writeback or any application fsync() drives the path automatically. A compromised server can simply wait for routine client I/O.\nS:U - The fault occurs in the NFS client within the kernel\u0027s own security authority; nothing crosses into another VM, hypervisor, or IOMMU/DMA boundary.\nC:N - The dereferenced value can only ever be ERR_PTR(-ENODEV), producing a fixed low address (0x65) below mmap_min_addr that faults immediately. No attacker data is read back and no kernel memory is disclosed.\nI:N - The bug is a read of an invalid fixed pointer with no write to kernel memory and no attacker influence over the faulting address, so there is no data modification or control-flow hijack primitive.\nA:H - The result is an unrecoverable kernel NULL-pointer dereference oops in writeback context (as captured in the production panic in the fix commit), taking down the client system. It can be re-triggered at will by the remote server, so affected clients can be kept permanently down."
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26868",
    "datePublished": "2024-04-17T10:27:29.431Z",
    "dateReserved": "2024-02-19T14:20:24.184Z",
    "dateUpdated": "2026-08-05T11:27:55.702Z",
    "state": "PUBLISHED"
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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FKIE_CVE-2024-26868

CVE-2024-26868 (GCVE-0-2024-26868)

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Nomenclature

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