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

Vulnerability from cvelistv5 – Published: 2025-09-16 13:00 – Updated: 2026-06-11 18:44
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
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)
Create a notification for this product.
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)
Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
Create a notification for this product.
Show details on NVD website
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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 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    "vulnrichment": {
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\"ssvc\", \"content\": {\"id\": \"CVE-2025-39817\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-10T20:40:28.646943Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-11T17:37:21.240Z\"}}], \"cna\": {\"title\": \"efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"da27a24383b2b10bf6ebd0db29b325548aafecb4\", \"lessThan\": \"0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"da27a24383b2b10bf6ebd0db29b325548aafecb4\", \"lessThan\": \"794399019301944fd6d2e0d7a51b3327e26c410e\", \"versionType\": 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{\"url\": \"https://git.kernel.org/stable/c/d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7\"}, {\"url\": \"https://git.kernel.org/stable/c/925599eba46045930b850a98ae594d2e3028ac40\"}, {\"url\": \"https://git.kernel.org/stable/c/c2925cd6207079c3f4d040d082515db78d63afbf\"}, {\"url\": \"https://git.kernel.org/stable/c/71581a82f38e5a4d807d71fc1bb59aead80ccf95\"}, {\"url\": \"https://git.kernel.org/stable/c/a6358f8cf64850f3f27857b8ed8c1b08cfc4685c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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  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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.298\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.242\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.191\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.150\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.104\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.45\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.5\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.17\", \"versionStartIncluding\": \"3.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.8.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T16:00:47.192Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-39817\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-11T18:44:01.643Z\", \"dateReserved\": \"2025-04-16T07:20:57.138Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-16T13:00:17.776Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.