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

Vulnerability from cvelistv5 – Published: 2024-04-17 10:27 – Updated: 2026-05-11 20:05
VLAI
Title
nfs: fix panic when nfs4_ff_layout_prepare_ds() fails
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.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted 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)
Create a notification for this product.
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)
Create a notification for this product.
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          "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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    "datePublished": "2024-04-17T10:27:29.431Z",
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    "epss": {
      "cve": "CVE-2024-26868",
      "date": "2026-07-23",
      "epss": "0.00225",
      "percentile": "0.1324"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26868\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-17T11:15:09.360\",\"lastModified\":\"2026-06-17T07:18:33.133\",\"vulnStatus\":\"Analyzed\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/nfs/flexfilelayout/flexfilelayout.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b739a5bd9d9f18cc69dced8db128ef7206e000cd\",\"lessThan\":\"31db25e3141b20e2a76a9f219eeca52e3cab126c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b739a5bd9d9f18cc69dced8db128ef7206e000cd\",\"lessThan\":\"7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b739a5bd9d9f18cc69dced8db128ef7206e000cd\",\"lessThan\":\"5ada9016b1217498fad876a3d5b07645cc955608\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b739a5bd9d9f18cc69dced8db128ef7206e000cd\",\"lessThan\":\"dac068f164ad05b35e7c0be13f138c3f6adca58f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b739a5bd9d9f18cc69dced8db128ef7206e000cd\",\"lessThan\":\"719fcafe07c12646691bd62d7f8d94d657fa0766\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/nfs/flexfilelayout/flexfilelayout.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.83\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.23\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.7.11\",\"lessThanOrEqual\":\"6.7.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.8.2\",\"lessThanOrEqual\":\"6.8.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.9\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-05-28T19:56:48.883135Z\",\"id\":\"CVE-2024-26868\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.1\",\"versionEndExcluding\":\"6.1.83\",\"matchCriteriaId\":\"3057E4AB-0FB4-49B3-B63D-10D187B96B1B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.23\",\"matchCriteriaId\":\"E00814DC-0BA7-431A-9926-80FEB4A96C68\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.11\",\"matchCriteriaId\":\"9B95D3A6-E162-47D5-ABFC-F3FA74FA7CFD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.8\",\"versionEndExcluding\":\"6.8.2\",\"matchCriteriaId\":\"543A75FF-25B8-4046-A514-1EA8EDD87AB1\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"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\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T14:02:54+00:00",
      "cve": "CVE-2024-26868",
      "id": "CVE-2024-26868",
      "initial_release_date": "2024-04-17T00:00:00+00:00",
      "product_status:fixed": "845",
      "product_status:known_affected": "64",
      "product_status:known_not_affected": "88",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfs: fix panic when nfs4_ff_layout_prepare_ds() fails",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26868.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/31db25e3141b20e2a76a9f219eeca52e3cab126c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5ada9016b1217498fad876a3d5b07645cc955608\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/dac068f164ad05b35e7c0be13f138c3f6adca58f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/719fcafe07c12646691bd62d7f8d94d657fa0766\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T00:21:04.259Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26868\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-28T19:56:48.883135Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-28T19:56:55.518Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"nfs: fix panic when nfs4_ff_layout_prepare_ds() fails\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b739a5bd9d9f18cc69dced8db128ef7206e000cd\", \"lessThan\": \"31db25e3141b20e2a76a9f219eeca52e3cab126c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b739a5bd9d9f18cc69dced8db128ef7206e000cd\", \"lessThan\": \"7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b739a5bd9d9f18cc69dced8db128ef7206e000cd\", \"lessThan\": \"5ada9016b1217498fad876a3d5b07645cc955608\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b739a5bd9d9f18cc69dced8db128ef7206e000cd\", \"lessThan\": \"dac068f164ad05b35e7c0be13f138c3f6adca58f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b739a5bd9d9f18cc69dced8db128ef7206e000cd\", \"lessThan\": \"719fcafe07c12646691bd62d7f8d94d657fa0766\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/nfs/flexfilelayout/flexfilelayout.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.23\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/nfs/flexfilelayout/flexfilelayout.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/31db25e3141b20e2a76a9f219eeca52e3cab126c\"}, {\"url\": \"https://git.kernel.org/stable/c/7ca651b4ec4a049f5a46a0e5ff921b86b91c47c5\"}, {\"url\": \"https://git.kernel.org/stable/c/5ada9016b1217498fad876a3d5b07645cc955608\"}, {\"url\": \"https://git.kernel.org/stable/c/dac068f164ad05b35e7c0be13f138c3f6adca58f\"}, {\"url\": \"https://git.kernel.org/stable/c/719fcafe07c12646691bd62d7f8d94d657fa0766\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:49:03.131Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26868\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:49:03.131Z\", \"dateReserved\": \"2024-02-19T14:20:24.184Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-17T10:27:29.431Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.