CVE-2025-39817 (GCVE-0-2025-39817)

Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2026-05-23 16:00
VLAI
Title
efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare
Summary
In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare Observed on kernel 6.6 (present on master as well): BUG: KASAN: slab-out-of-bounds in memcmp+0x98/0xd0 Call trace: kasan_check_range+0xe8/0x190 __asan_loadN+0x1c/0x28 memcmp+0x98/0xd0 efivarfs_d_compare+0x68/0xd8 __d_lookup_rcu_op_compare+0x178/0x218 __d_lookup_rcu+0x1f8/0x228 d_alloc_parallel+0x150/0x648 lookup_open.isra.0+0x5f0/0x8d0 open_last_lookups+0x264/0x828 path_openat+0x130/0x3f8 do_filp_open+0x114/0x248 do_sys_openat2+0x340/0x3c0 __arm64_sys_openat+0x120/0x1a0 If dentry->d_name.len < EFI_VARIABLE_GUID_LEN , 'guid' can become negative, leadings to oob. The issue can be triggered by parallel lookups using invalid filename: T1 T2 lookup_open ->lookup simple_lookup d_add // invalid dentry is added to hash list lookup_open d_alloc_parallel __d_lookup_rcu __d_lookup_rcu_op_compare hlist_bl_for_each_entry_rcu // invalid dentry can be retrieved ->d_compare efivarfs_d_compare // oob Fix it by checking 'guid' before cmp.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6 (git)
Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < 794399019301944fd6d2e0d7a51b3327e26c410e (git)
Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < 568e7761279b99c6daa3002290fd6d8047ddb6d2 (git)
Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7 (git)
Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < 925599eba46045930b850a98ae594d2e3028ac40 (git)
Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < c2925cd6207079c3f4d040d082515db78d63afbf (git)
Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < 71581a82f38e5a4d807d71fc1bb59aead80ccf95 (git)
Affected: da27a24383b2b10bf6ebd0db29b325548aafecb4 , < a6358f8cf64850f3f27857b8ed8c1b08cfc4685c (git)
Affected: 688289c4b745c018b3449b4b4c5a2030083c8eaf (git)
Affected: 3.8.2 , < 3.9 (semver)
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Linux Linux Affected: 3.9
Unaffected: 0 , < 3.9 (semver)
Unaffected: 5.4.298 , ≤ 5.4.* (semver)
Unaffected: 5.10.242 , ≤ 5.10.* (semver)
Unaffected: 5.15.191 , ≤ 5.15.* (semver)
Unaffected: 6.1.150 , ≤ 6.1.* (semver)
Unaffected: 6.6.104 , ≤ 6.6.* (semver)
Unaffected: 6.12.45 , ≤ 6.12.* (semver)
Unaffected: 6.16.5 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-39817\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-16T13:15:57.187\",\"lastModified\":\"2026-05-12T13:17:13.213\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nefivarfs: Fix slab-out-of-bounds in efivarfs_d_compare\\n\\nObserved on kernel 6.6 (present on master as well):\\n\\n  BUG: KASAN: slab-out-of-bounds in memcmp+0x98/0xd0\\n  Call trace:\\n   kasan_check_range+0xe8/0x190\\n   __asan_loadN+0x1c/0x28\\n   memcmp+0x98/0xd0\\n   efivarfs_d_compare+0x68/0xd8\\n   __d_lookup_rcu_op_compare+0x178/0x218\\n   __d_lookup_rcu+0x1f8/0x228\\n   d_alloc_parallel+0x150/0x648\\n   lookup_open.isra.0+0x5f0/0x8d0\\n   open_last_lookups+0x264/0x828\\n   path_openat+0x130/0x3f8\\n   do_filp_open+0x114/0x248\\n   do_sys_openat2+0x340/0x3c0\\n   __arm64_sys_openat+0x120/0x1a0\\n\\nIf dentry-\u003ed_name.len \u003c EFI_VARIABLE_GUID_LEN , \u0027guid\u0027 can become\\nnegative, leadings to oob. The issue can be triggered by parallel\\nlookups using invalid filename:\\n\\n  T1\\t\\t\\tT2\\n  lookup_open\\n   -\u003elookup\\n    simple_lookup\\n     d_add\\n     // invalid dentry is added to hash list\\n\\n\\t\\t\\tlookup_open\\n\\t\\t\\t d_alloc_parallel\\n\\t\\t\\t  __d_lookup_rcu\\n\\t\\t\\t   __d_lookup_rcu_op_compare\\n\\t\\t\\t    hlist_bl_for_each_entry_rcu\\n\\t\\t\\t    // invalid dentry can be retrieved\\n\\t\\t\\t     -\u003ed_compare\\n\\t\\t\\t      efivarfs_d_compare\\n\\t\\t\\t      // oob\\n\\nFix it by checking \u0027guid\u0027 before cmp.\"}],\"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:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.8.2\",\"versionEndExcluding\":\"5.4.298\",\"matchCriteriaId\":\"61F187E4-21A5-490D-8D8F-F13FD11A6A69\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.242\",\"matchCriteriaId\":\"CFAE7D1D-31D7-4259-8581-3CB64D12DE3B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.191\",\"matchCriteriaId\":\"A532F1D1-B7A9-4745-AB0E-B6AD12CAD0BD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.150\",\"matchCriteriaId\":\"67AC87D5-97BF-4617-92EF-9E282B6D1CF7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.104\",\"matchCriteriaId\":\"FD12E3C3-F737-4936-9A57-80832E36D22F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.45\",\"matchCriteriaId\":\"DC443D7D-A411-41FB-BB45-010F36EF7C94\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.16.5\",\"matchCriteriaId\":\"EB781080-7001-4FA1-B388-517FFEFBC73E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"327D22EF-390B-454C-BD31-2ED23C998A1C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"C730CD9A-D969-4A8E-9522-162AAF7C0EE9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"39982C4B-716E-4B2F-8196-FA301F47807D\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/568e7761279b99c6daa3002290fd6d8047ddb6d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/71581a82f38e5a4d807d71fc1bb59aead80ccf95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/794399019301944fd6d2e0d7a51b3327e26c410e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/925599eba46045930b850a98ae594d2e3028ac40\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a6358f8cf64850f3f27857b8ed8c1b08cfc4685c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c2925cd6207079c3f4d040d082515db78d63afbf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}"
  }
}


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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.