{ "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": "2026-06-11T18:44:01.643Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T16:00:47.192Z" }, "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" }, { "version": "3.8.2", "lessThan": "3.9", "status": "affected", "versionType": "semver" } ] }, { "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" } ] }, { "metrics": [ { "other": { "type": "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" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-11T18:44:01.643Z" } } ] } }