CVE-2022-49168 (GCVE-0-2022-49168)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:55 – Updated: 2026-08-05 08:54
VLAI
Title
btrfs: do not clean up repair bio if submit fails
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not clean up repair bio if submit fails The submit helper will always run bio_endio() on the bio if it fails to submit, so cleaning up the bio just leads to a variety of use-after-free and NULL pointer dereference bugs because we race with the endio function that is cleaning up the bio. Instead just return BLK_STS_OK as the repair function has to continue to process the rest of the pages, and the endio for the repair bio will do the appropriate cleanup for the page that it was given.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6c387ab20db15f2bd448f7c508e2638101b16ea1 , < e7e1d15d2bd8c373cf621614ddd17971a2132713 (git)
Affected: 6c387ab20db15f2bd448f7c508e2638101b16ea1 , < 7170875083254b51fcc5d67f96640977083f481e (git)
Affected: 6c387ab20db15f2bd448f7c508e2638101b16ea1 , < e76c78c48902dae6fa612749f59162bca0a79e0b (git)
Affected: 6c387ab20db15f2bd448f7c508e2638101b16ea1 , < d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14 (git)
Affected: 6c387ab20db15f2bd448f7c508e2638101b16ea1 , < 8cbc3001a3264d998d6b6db3e23f935c158abd4d (git)
Create a notification for this product.
Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.184 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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Instead just return BLK_STS_OK as\\nthe repair function has to continue to process the rest of the pages,\\nand the endio for the repair bio will do the appropriate cleanup for the\\npage that it was given.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: no limpiar la biograf\u00eda de reparaci\u00f3n si falla el env\u00edo El asistente de env\u00edo siempre ejecutar\u00e1 bio_endio() en la biograf\u00eda si falla el env\u00edo, por lo que limpiar la biograf\u00eda solo conduce a una variedad de errores de use-after-free y de desreferencia de puntero NULL porque competimos con la funci\u00f3n endio que est\u00e1 limpiando la biograf\u00eda. En su lugar, solo devuelva BLK_STS_OK ya que la funci\u00f3n de reparaci\u00f3n tiene que continuar procesando el resto de las p\u00e1ginas, y el endio para la biograf\u00eda de reparaci\u00f3n har\u00e1 la limpieza adecuada para la p\u00e1gina que se le 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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49168\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-27T18:17:10.610606Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-27T18:17:11.935Z\"}}], \"cna\": {\"title\": \"btrfs: do not clean up repair bio if submit fails\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is in btrfs read-repair (`btrfs_repair_one_sector` via buffered `end_bio_extent_readpage`/`submit_read_repair` or DIO `btrfs_check_read_dio_bio`), reached only through local VFS reads on a mounted btrfs volume, not through a network protocol handler.\\nAC:L - On a multi-copy deployment (RAID1/DUP/RAID10\\u2014reasonable for btrfs), once repair runs, a failing `btrfs_submit_data_bio` (e.g. ENOMEM in `btrfs_bio_wq_end_io`) deterministically double-frees via `bio_endio` plus `free_io_failure`/`bio_put`; the attacker can drive memory pressure and does not need an uncontrolled race to hit the UAF.\\nPR:L - An unprivileged local user who can read files on an already-mounted multi-copy btrfs filesystem can exercise the repair path; btrfs is not user-ns mountable here, but no real root/init-namespace admin capability is required to trigger the bug.\\nUI:N - No separate victim action is required once the filesystem is mounted; the attacker triggers the path by reading (and optionally stressing memory) without needing another user to open or mount anything.\\nS:U - Impact remains within the local kernel/OS authority as standard kernel memory corruption/DoS; there is no VM escape, IOMMU bypass, or other cross-boundary effect.\\nC:H - Double cleanup yields use-after-free of the repair bio and/or `io_failure_record` (via `bio_put` and `kfree` in `free_io_failure` while endio also tears them down), which enables reclaim and arbitrary read primitives.\\nI:H - The same bio/failrec UAF and concurrent endio cleanup is heap memory corruption that can be leveraged for write primitives and control-flow hijacking.\\nA:H - The commit documents UAF and NULL dereferences from racing endio cleanup; double `bio_put`/`free_io_failure` reliably causes kernel oops/panic or equivalent denial of service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6c387ab20db15f2bd448f7c508e2638101b16ea1\", \"lessThan\": \"e7e1d15d2bd8c373cf621614ddd17971a2132713\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6c387ab20db15f2bd448f7c508e2638101b16ea1\", \"lessThan\": \"7170875083254b51fcc5d67f96640977083f481e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6c387ab20db15f2bd448f7c508e2638101b16ea1\", \"lessThan\": \"e76c78c48902dae6fa612749f59162bca0a79e0b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6c387ab20db15f2bd448f7c508e2638101b16ea1\", \"lessThan\": \"d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6c387ab20db15f2bd448f7c508e2638101b16ea1\", \"lessThan\": \"8cbc3001a3264d998d6b6db3e23f935c158abd4d\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/extent_io.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.248\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.184\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/btrfs/extent_io.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e7e1d15d2bd8c373cf621614ddd17971a2132713\"}, {\"url\": \"https://git.kernel.org/stable/c/7170875083254b51fcc5d67f96640977083f481e\"}, {\"url\": \"https://git.kernel.org/stable/c/e76c78c48902dae6fa612749f59162bca0a79e0b\"}, {\"url\": \"https://git.kernel.org/stable/c/d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14\"}, {\"url\": \"https://git.kernel.org/stable/c/8cbc3001a3264d998d6b6db3e23f935c158abd4d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: do not clean up repair bio if submit fails\\n\\nThe submit helper will always run bio_endio() on the bio if it fails to\\nsubmit, so cleaning up the bio just leads to a variety of use-after-free\\nand NULL pointer dereference bugs because we race with the endio\\nfunction that is cleaning up the bio.  Instead just return BLK_STS_OK as\\nthe repair function has to continue to process the rest of the pages,\\nand the endio for the repair bio will do the appropriate cleanup for the\\npage that it was given.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.184\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"3.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"3.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:54:12.330Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49168\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:54:12.330Z\", \"dateReserved\": \"2025-02-26T01:49:39.278Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T01:55:26.532Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.