CVE-2025-21658 (GCVE-0-2025-21658)

Vulnerability from cvelistv5 – Published: 2025-01-21 12:18 – Updated: 2026-05-11 21:03
VLAI?
Title
btrfs: avoid NULL pointer dereference if no valid extent tree
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: avoid NULL pointer dereference if no valid extent tree [BUG] Syzbot reported a crash with the following call trace: BTRFS info (device loop0): scrub: started on devid 1 BUG: kernel NULL pointer dereference, address: 0000000000000208 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 106e70067 P4D 106e70067 PUD 107143067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 UID: 0 PID: 689 Comm: repro Kdump: loaded Tainted: G O 6.13.0-rc4-custom+ #206 Tainted: [O]=OOT_MODULE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:find_first_extent_item+0x26/0x1f0 [btrfs] Call Trace: <TASK> scrub_find_fill_first_stripe+0x13d/0x3b0 [btrfs] scrub_simple_mirror+0x175/0x260 [btrfs] scrub_stripe+0x5d4/0x6c0 [btrfs] scrub_chunk+0xbb/0x170 [btrfs] scrub_enumerate_chunks+0x2f4/0x5f0 [btrfs] btrfs_scrub_dev+0x240/0x600 [btrfs] btrfs_ioctl+0x1dc8/0x2fa0 [btrfs] ? do_sys_openat2+0xa5/0xf0 __x64_sys_ioctl+0x97/0xc0 do_syscall_64+0x4f/0x120 entry_SYSCALL_64_after_hwframe+0x76/0x7e </TASK> [CAUSE] The reproducer is using a corrupted image where extent tree root is corrupted, thus forcing to use "rescue=all,ro" mount option to mount the image. Then it triggered a scrub, but since scrub relies on extent tree to find where the data/metadata extents are, scrub_find_fill_first_stripe() relies on an non-empty extent root. But unfortunately scrub_find_fill_first_stripe() doesn't really expect an NULL pointer for extent root, it use extent_root to grab fs_info and triggered a NULL pointer dereference. [FIX] Add an extra check for a valid extent root at the beginning of scrub_find_fill_first_stripe(). The new error path is introduced by 42437a6386ff ("btrfs: introduce mount option rescue=ignorebadroots"), but that's pretty old, and later commit b979547513ff ("btrfs: scrub: introduce helper to find and fill sector info for a scrub_stripe") changed how we do scrub. So for kernels older than 6.6, the fix will need manual backport.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 42437a6386ffeaaf200731e73d723ea491f3fe7d , < 24b85a8b0310e0144da9ab30be42e87e6476638a (git)
Affected: 42437a6386ffeaaf200731e73d723ea491f3fe7d , < aee5f69f3e6cd82bfefaca1b70b40b6cd8f3f784 (git)
Affected: 42437a6386ffeaaf200731e73d723ea491f3fe7d , < 6aecd91a5c5b68939cf4169e32bc49f3cd2dd329 (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 6.6.72 , ≤ 6.6.* (semver)
Unaffected: 6.12.10 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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Luego, activ\u00f3 una limpieza, pero como la limpieza depende del \u00e1rbol de extensi\u00f3n para encontrar d\u00f3nde est\u00e1n las extensiones de datos/metadatos, scrub_find_fill_first_stripe() depende de una ra\u00edz de extensi\u00f3n no vac\u00eda. Pero desafortunadamente scrub_find_fill_first_stripe() no espera realmente un puntero NULL para la ra\u00edz de la extensi\u00f3n, usa extended_root para obtener fs_info y activa una desreferencia de puntero NULL. [SOLUCI\u00d3N] Agregue una verificaci\u00f3n adicional para una ra\u00edz de extensi\u00f3n v\u00e1lida al comienzo de scrub_find_fill_first_stripe(). La nueva ruta de error es introducida por 42437a6386ff (\\\"btrfs: introduce mount option rescue=ignorebadroots\\\"), pero eso es bastante antiguo, y el commit posterior b979547513ff (\\\"btrfs: scrub: introduce helper to find and fill sector info for a scrub_stripe\\\") cambi\u00f3 la forma en que realizamos el scrub. Entonces, para los kernels anteriores a 6.6, la soluci\u00f3n necesitar\u00e1 una adaptaci\u00f3n manual. \"}],\"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},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"6.6.72\",\"matchCriteriaId\":\"AD41C3D4-D314-4BC5-888E-E1B87323349D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.10\",\"matchCriteriaId\":\"02D604F6-10D1-4F7B-A022-0888406A1121\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5A073481-106D-4B15-B4C7-FB0213B8E1D4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"DE491969-75AE-4A6B-9A58-8FC5AF98798F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"93C0660D-7FB8-4FBA-892A-B064BA71E49E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"034C36A6-C481-41F3-AE9A-D116E5BE6895\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"8AF9DC49-2085-4FFB-A7E3-73DFAFECC7F2\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/24b85a8b0310e0144da9ab30be42e87e6476638a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6aecd91a5c5b68939cf4169e32bc49f3cd2dd329\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aee5f69f3e6cd82bfefaca1b70b40b6cd8f3f784\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-21658\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T19:52:37.080379Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T15:58:02.174Z\"}}], \"cna\": {\"title\": \"btrfs: avoid NULL pointer dereference if no valid extent tree\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"42437a6386ffeaaf200731e73d723ea491f3fe7d\", \"lessThan\": \"24b85a8b0310e0144da9ab30be42e87e6476638a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"42437a6386ffeaaf200731e73d723ea491f3fe7d\", \"lessThan\": \"aee5f69f3e6cd82bfefaca1b70b40b6cd8f3f784\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"42437a6386ffeaaf200731e73d723ea491f3fe7d\", \"lessThan\": \"6aecd91a5c5b68939cf4169e32bc49f3cd2dd329\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/scrub.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.72\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/btrfs/scrub.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/24b85a8b0310e0144da9ab30be42e87e6476638a\"}, {\"url\": \"https://git.kernel.org/stable/c/aee5f69f3e6cd82bfefaca1b70b40b6cd8f3f784\"}, {\"url\": \"https://git.kernel.org/stable/c/6aecd91a5c5b68939cf4169e32bc49f3cd2dd329\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: avoid NULL pointer dereference if no valid extent tree\\n\\n[BUG]\\nSyzbot reported a crash with the following call trace:\\n\\n  BTRFS info (device loop0): scrub: started on devid 1\\n  BUG: kernel NULL pointer dereference, address: 0000000000000208\\n  #PF: supervisor read access in kernel mode\\n  #PF: error_code(0x0000) - not-present page\\n  PGD 106e70067 P4D 106e70067 PUD 107143067 PMD 0\\n  Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\\n  CPU: 1 UID: 0 PID: 689 Comm: repro Kdump: loaded Tainted: G           O       6.13.0-rc4-custom+ #206\\n  Tainted: [O]=OOT_MODULE\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\\n  RIP: 0010:find_first_extent_item+0x26/0x1f0 [btrfs]\\n  Call Trace:\\n   \u003cTASK\u003e\\n   scrub_find_fill_first_stripe+0x13d/0x3b0 [btrfs]\\n   scrub_simple_mirror+0x175/0x260 [btrfs]\\n   scrub_stripe+0x5d4/0x6c0 [btrfs]\\n   scrub_chunk+0xbb/0x170 [btrfs]\\n   scrub_enumerate_chunks+0x2f4/0x5f0 [btrfs]\\n   btrfs_scrub_dev+0x240/0x600 [btrfs]\\n   btrfs_ioctl+0x1dc8/0x2fa0 [btrfs]\\n   ? do_sys_openat2+0xa5/0xf0\\n   __x64_sys_ioctl+0x97/0xc0\\n   do_syscall_64+0x4f/0x120\\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n   \u003c/TASK\u003e\\n\\n[CAUSE]\\nThe reproducer is using a corrupted image where extent tree root is\\ncorrupted, thus forcing to use \\\"rescue=all,ro\\\" mount option to mount the\\nimage.\\n\\nThen it triggered a scrub, but since scrub relies on extent tree to find\\nwhere the data/metadata extents are, scrub_find_fill_first_stripe()\\nrelies on an non-empty extent root.\\n\\nBut unfortunately scrub_find_fill_first_stripe() doesn\u0027t really expect\\nan NULL pointer for extent root, it use extent_root to grab fs_info and\\ntriggered a NULL pointer dereference.\\n\\n[FIX]\\nAdd an extra check for a valid extent root at the beginning of\\nscrub_find_fill_first_stripe().\\n\\nThe new error path is introduced by 42437a6386ff (\\\"btrfs: introduce\\nmount option rescue=ignorebadroots\\\"), but that\u0027s pretty old, and later\\ncommit b979547513ff (\\\"btrfs: scrub: introduce helper to find and fill\\nsector info for a scrub_stripe\\\") changed how we do scrub.\\n\\nSo for kernels older than 6.6, the fix will need manual backport.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.72\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.10\", \"versionStartIncluding\": \"5.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"5.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:18:24.189Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21658\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T19:57:13.496Z\", \"dateReserved\": \"2024-12-29T08:45:45.731Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-01-21T12:18:14.578Z\", \"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.