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CVE-2023-52976 (GCVE-0-2023-52976)

Vulnerability from cvelistv5 – Published: 2025-03-27 16:43 – Updated: 2026-05-23 15:27
VLAI
Title
efi: fix potential NULL deref in efi_mem_reserve_persistent
Summary
In the Linux kernel, the following vulnerability has been resolved: efi: fix potential NULL deref in efi_mem_reserve_persistent When iterating on a linked list, a result of memremap is dereferenced without checking it for NULL. This patch adds a check that falls back on allocating a new page in case memremap doesn't succeed. Found by Linux Verification Center (linuxtesting.org) with SVACE. [ardb: return -ENOMEM instead of breaking out of the loop]
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 2025-10-01 17:22 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 18df7577adae6c6c778bf774b3aebcacbc1fb439 , < d92a25627bcdf264183670da73c9a60c0bac327e (git)
Affected: 18df7577adae6c6c778bf774b3aebcacbc1fb439 , < 87d4ff18738fd71e7e3c10827c80257da6283697 (git)
Affected: 18df7577adae6c6c778bf774b3aebcacbc1fb439 , < d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c (git)
Affected: 18df7577adae6c6c778bf774b3aebcacbc1fb439 , < a2e6a9ff89f13666a1c3ff7195612ab949ea9afc (git)
Affected: 18df7577adae6c6c778bf774b3aebcacbc1fb439 , < 966d47e1f27c45507c5df82b2a2157e5a4fd3909 (git)
Affected: b5961ecad7121fec138ebee7d9eba4863f9dc6e7 (git)
Affected: 5.1.16 , < 5.2 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.4.232 , ≤ 5.4.* (semver)
Unaffected: 5.10.168 , ≤ 5.10.* (semver)
Unaffected: 5.15.93 , ≤ 5.15.* (semver)
Unaffected: 6.1.11 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (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-2023-52976\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-10-01T17:22:07.723841Z\"}}}], \"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\": \"2025-10-01T14:36:05.832Z\"}}], \"cna\": {\"title\": \"efi: fix potential NULL deref in efi_mem_reserve_persistent\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"18df7577adae6c6c778bf774b3aebcacbc1fb439\", \"lessThan\": \"d92a25627bcdf264183670da73c9a60c0bac327e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"18df7577adae6c6c778bf774b3aebcacbc1fb439\", \"lessThan\": \"87d4ff18738fd71e7e3c10827c80257da6283697\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"18df7577adae6c6c778bf774b3aebcacbc1fb439\", \"lessThan\": \"d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"18df7577adae6c6c778bf774b3aebcacbc1fb439\", \"lessThan\": \"a2e6a9ff89f13666a1c3ff7195612ab949ea9afc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"18df7577adae6c6c778bf774b3aebcacbc1fb439\", \"lessThan\": \"966d47e1f27c45507c5df82b2a2157e5a4fd3909\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b5961ecad7121fec138ebee7d9eba4863f9dc6e7\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/firmware/efi/efi.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.232\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/firmware/efi/efi.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/d92a25627bcdf264183670da73c9a60c0bac327e\"}, {\"url\": \"https://git.kernel.org/stable/c/87d4ff18738fd71e7e3c10827c80257da6283697\"}, {\"url\": \"https://git.kernel.org/stable/c/d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c\"}, {\"url\": \"https://git.kernel.org/stable/c/a2e6a9ff89f13666a1c3ff7195612ab949ea9afc\"}, {\"url\": \"https://git.kernel.org/stable/c/966d47e1f27c45507c5df82b2a2157e5a4fd3909\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nefi: fix potential NULL deref in efi_mem_reserve_persistent\\n\\nWhen iterating on a linked list, a result of memremap is dereferenced\\nwithout checking it for NULL.\\n\\nThis patch adds a check that falls back on allocating a new page in\\ncase memremap doesn\u0027t succeed.\\n\\nFound by Linux Verification Center (linuxtesting.org) with SVACE.\\n\\n[ardb: return -ENOMEM instead of breaking out of the loop]\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.232\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.168\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.93\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.11\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.1.16\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:49:57.192Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52976\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-01T17:22:10.974Z\", \"dateReserved\": \"2025-03-27T16:40:15.738Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-27T16:43:16.596Z\", \"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.