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CVE-2023-53421 (GCVE-0-2023-53421)

Vulnerability from cvelistv5 – Published: 2025-09-18 16:04 – Updated: 2026-06-01 16:04
VLAI
Title
blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats() When blkg_alloc() is called to allocate a blkcg_gq structure with the associated blkg_iostat_set's, there are 2 fields within blkg_iostat_set that requires proper initialization - blkg & sync. The former field was introduced by commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") while the later one was introduced by commit f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat"). Unfortunately those fields in the blkg_iostat_set's are not properly re-initialized when they are cleared in v1's blkcg_reset_stats(). This can lead to a kernel panic due to NULL pointer access of the blkg pointer. The missing initialization of sync is less problematic and can be a problem in a debug kernel due to missing lockdep initialization. Fix these problems by re-initializing them after memory clearing.
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:12 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f73316482977ac401ac37245c9df48079d4e11f3 , < 58c135513562698f222a58ba07dbdfcfb268aa0d (git)
Affected: f73316482977ac401ac37245c9df48079d4e11f3 , < 0561aa6033dd181594116d705c41fc16e97161a2 (git)
Affected: f73316482977ac401ac37245c9df48079d4e11f3 , < 892faa76be894d324bf48b12a55c7af7be2bad83 (git)
Affected: f73316482977ac401ac37245c9df48079d4e11f3 , < b0d26283af612b9e0cc3188b0b88ad7fdea447e8 (git)
Affected: f73316482977ac401ac37245c9df48079d4e11f3 , < abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2 (git)
Affected: f73316482977ac401ac37245c9df48079d4e11f3 , < 3d2af77e31ade05ff7ccc3658c3635ec1bea0979 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.3.13 , ≤ 6.3.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    },
    "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-2023-53421\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-14T19:12:11.098390Z\"}}}], \"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\": \"2026-01-14T19:12:06.427Z\"}}], \"cna\": {\"title\": \"blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f73316482977ac401ac37245c9df48079d4e11f3\", \"lessThan\": \"58c135513562698f222a58ba07dbdfcfb268aa0d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f73316482977ac401ac37245c9df48079d4e11f3\", \"lessThan\": \"0561aa6033dd181594116d705c41fc16e97161a2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f73316482977ac401ac37245c9df48079d4e11f3\", \"lessThan\": \"892faa76be894d324bf48b12a55c7af7be2bad83\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f73316482977ac401ac37245c9df48079d4e11f3\", \"lessThan\": \"b0d26283af612b9e0cc3188b0b88ad7fdea447e8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f73316482977ac401ac37245c9df48079d4e11f3\", \"lessThan\": \"abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f73316482977ac401ac37245c9df48079d4e11f3\", \"lessThan\": \"3d2af77e31ade05ff7ccc3658c3635ec1bea0979\", \"versionType\": \"git\"}], \"programFiles\": [\"block/blk-cgroup.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.199\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.162\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.3.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.3.*\"}, {\"status\": \"unaffected\", \"version\": \"6.4.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.4.*\"}, {\"status\": \"unaffected\", \"version\": \"6.5\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"block/blk-cgroup.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/58c135513562698f222a58ba07dbdfcfb268aa0d\"}, {\"url\": \"https://git.kernel.org/stable/c/0561aa6033dd181594116d705c41fc16e97161a2\"}, {\"url\": \"https://git.kernel.org/stable/c/892faa76be894d324bf48b12a55c7af7be2bad83\"}, {\"url\": \"https://git.kernel.org/stable/c/b0d26283af612b9e0cc3188b0b88ad7fdea447e8\"}, {\"url\": \"https://git.kernel.org/stable/c/abbce7f82613ea5eeefd0fc3c1c8e449b9cef2a2\"}, {\"url\": \"https://git.kernel.org/stable/c/3d2af77e31ade05ff7ccc3658c3635ec1bea0979\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()\\n\\nWhen blkg_alloc() is called to allocate a blkcg_gq structure\\nwith the associated blkg_iostat_set\u0027s, there are 2 fields within\\nblkg_iostat_set that requires proper initialization - blkg \u0026 sync.\\nThe former field was introduced by commit 3b8cc6298724 (\\\"blk-cgroup:\\nOptimize blkcg_rstat_flush()\\\") while the later one was introduced by\\ncommit f73316482977 (\\\"blk-cgroup: reimplement basic IO stats using\\ncgroup rstat\\\").\\n\\nUnfortunately those fields in the blkg_iostat_set\u0027s are not properly\\nre-initialized when they are cleared in v1\u0027s blkcg_reset_stats(). This\\ncan lead to a kernel panic due to NULL pointer access of the blkg\\npointer. The missing initialization of sync is less problematic and\\ncan be a problem in a debug kernel due to missing lockdep initialization.\\n\\nFix these problems by re-initializing them after memory clearing.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.199\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.162\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.3.13\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.4.4\", \"versionStartIncluding\": \"5.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.5\", \"versionStartIncluding\": \"5.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-06-01T16:04:11.445Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-53421\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-01T16:04:11.445Z\", \"dateReserved\": \"2025-09-17T14:54:09.741Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-18T16:04:04.526Z\", \"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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.