{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39817","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-04-16T07:20:57.138Z","datePublished":"2025-09-16T13:00:17.776Z","dateUpdated":"2026-05-12T12:07:15.910Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:36:55.610Z"},"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->d_name.len < EFI_VARIABLE_GUID_LEN , 'guid' 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   ->lookup\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     ->d_compare\n\t\t\t      efivarfs_d_compare\n\t\t\t      // oob\n\nFix it by checking 'guid' before cmp."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/efivarfs/super.c"],"versions":[{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6","status":"affected","versionType":"git"},{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"794399019301944fd6d2e0d7a51b3327e26c410e","status":"affected","versionType":"git"},{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"568e7761279b99c6daa3002290fd6d8047ddb6d2","status":"affected","versionType":"git"},{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7","status":"affected","versionType":"git"},{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"925599eba46045930b850a98ae594d2e3028ac40","status":"affected","versionType":"git"},{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"c2925cd6207079c3f4d040d082515db78d63afbf","status":"affected","versionType":"git"},{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"71581a82f38e5a4d807d71fc1bb59aead80ccf95","status":"affected","versionType":"git"},{"version":"da27a24383b2b10bf6ebd0db29b325548aafecb4","lessThan":"a6358f8cf64850f3f27857b8ed8c1b08cfc4685c","status":"affected","versionType":"git"},{"version":"688289c4b745c018b3449b4b4c5a2030083c8eaf","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/efivarfs/super.c"],"versions":[{"version":"3.9","status":"affected"},{"version":"0","lessThan":"3.9","status":"unaffected","versionType":"semver"},{"version":"5.4.298","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.242","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.191","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.150","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.104","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.45","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.16.5","lessThanOrEqual":"6.16.*","status":"unaffected","versionType":"semver"},{"version":"6.17","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.4.298"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.10.242"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"5.15.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.1.150"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.6.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.12.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.16.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.8.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6"},{"url":"https://git.kernel.org/stable/c/794399019301944fd6d2e0d7a51b3327e26c410e"},{"url":"https://git.kernel.org/stable/c/568e7761279b99c6daa3002290fd6d8047ddb6d2"},{"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"}],"title":"efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T17:43:40.463Z"}},{"x_adpType":"supplier","providerMetadata":{"orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP","dateUpdated":"2026-05-12T12:07:15.910Z"},"affected":[{"vendor":"Siemens","product":"SIMATIC CN 4100","versions":[{"status":"affected","version":"0","lessThan":"V5.0","versionType":"custom"}],"defaultStatus":"unknown"}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}]}]}}