CVE-2024-50191 (GCVE-0-2024-50191)

Vulnerability from cvelistv5 – Published: 2024-11-08 05:43 – Updated: 2026-05-11 20:47
VLAI
Title
ext4: don't set SB_RDONLY after filesystem errors
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: don't set SB_RDONLY after filesystem errors When the filesystem is mounted with errors=remount-ro, we were setting SB_RDONLY flag to stop all filesystem modifications. We knew this misses proper locking (sb->s_umount) and does not go through proper filesystem remount procedure but it has been the way this worked since early ext2 days and it was good enough for catastrophic situation damage mitigation. Recently, syzbot has found a way (see link) to trigger warnings in filesystem freezing because the code got confused by SB_RDONLY changing under its hands. Since these days we set EXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all filesystem modifications, modifying SB_RDONLY shouldn't be needed. So stop doing that.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 95257987a6387f02970eda707e55a06cce734e18 , < 58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9 (git)
Affected: 95257987a6387f02970eda707e55a06cce734e18 , < ee77c388469116565e009eaa704a60bc78489e09 (git)
Affected: 95257987a6387f02970eda707e55a06cce734e18 , < d3476f3dad4ad68ae5f6b008ea6591d1520da5d8 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.57 , ≤ 6.6.* (semver)
Unaffected: 6.11.4 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T22:26:44.672Z\"}}, {\"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-2024-50191\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T20:18:18.496459Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-10-01T15:21:03.312Z\"}}], \"cna\": {\"title\": \"ext4: don\u0027t set SB_RDONLY after filesystem errors\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"95257987a6387f02970eda707e55a06cce734e18\", \"lessThan\": \"58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"95257987a6387f02970eda707e55a06cce734e18\", \"lessThan\": \"ee77c388469116565e009eaa704a60bc78489e09\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"95257987a6387f02970eda707e55a06cce734e18\", \"lessThan\": \"d3476f3dad4ad68ae5f6b008ea6591d1520da5d8\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/ext4/super.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.57\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/super.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/58c0648e4c773f5b54f0cb63bc8c7c6bf52719a9\"}, {\"url\": \"https://git.kernel.org/stable/c/ee77c388469116565e009eaa704a60bc78489e09\"}, {\"url\": \"https://git.kernel.org/stable/c/d3476f3dad4ad68ae5f6b008ea6591d1520da5d8\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: don\u0027t set SB_RDONLY after filesystem errors\\n\\nWhen the filesystem is mounted with errors=remount-ro, we were setting\\nSB_RDONLY flag to stop all filesystem modifications. We knew this misses\\nproper locking (sb-\u003es_umount) and does not go through proper filesystem\\nremount procedure but it has been the way this worked since early ext2\\ndays and it was good enough for catastrophic situation damage\\nmitigation. Recently, syzbot has found a way (see link) to trigger\\nwarnings in filesystem freezing because the code got confused by\\nSB_RDONLY changing under its hands. Since these days we set\\nEXT4_FLAGS_SHUTDOWN on the superblock which is enough to stop all\\nfilesystem modifications, modifying SB_RDONLY shouldn\u0027t be needed. So\\nstop doing that.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.57\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.4\", \"versionStartIncluding\": \"6.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"6.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:55:15.999Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50191\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:55:15.999Z\", \"dateReserved\": \"2024-10-21T19:36:19.967Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-08T05:43:47.840Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.