{"id":"CVE-2026-97555","aliases":[],"cve":{"records":[{"id":"CVE-2026-97555","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-24T16:01:01.154Z","published":"2026-09-25T10:21:46.445Z","modified":"2026-10-30T12:37:19.991Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:37:19.991Z"}],"references":[{"url":"https://git.kernel.org/stable/c/4e78b5ff13214353750b87283ff79f62510f5844","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/63c2fbde15ffc9a0c21adf670c38d028e20fa65c","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/d5cea6766ae1868a51c7d17d77d065b4f55c587f","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/7fa84c9ca690643f429ae2709584a47e74b572c9","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/0ee150794c75bcd0be0e24ff3394f433cbae18cc","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"smb: client: fix heap overflow in DACL owner/group rewrite","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix heap overflow in DACL owner/group rewrite\n\nWhen id_mode_to_cifs_acl rewrites an existing DACL, it allocates a\nbuffer sized according to the on-disk DACL length reported by\ndacl_ptr->size. However, replace_sids_and_copy_aces may rewrite each\nACE with a new owner/group SID obtained from the cifs.idmap upcall.\nThose SIDs can have up to SID_MAX_SUB_AUTHORITIES (15) sub-authorities,\nmaking each ACE up to 76 bytes (sizeof(struct smb_ace)).\n\nIf the original DACL contains short SIDs (e.g., 1 sub-authority) while\nthe replacement SIDs are long, the rewritten ACEs overflow the\nallocation.\n\nFix this by always budgeting for worst-case SID expansion: allocate\nsizeof(struct smb_acl) plus num_aces * sizeof(struct smb_ace), which\ncovers the smb_acl header and room for every ACE at maximum SID size.\nThis replaces the previous split logic that used dacl_ptr->size for\ncifsacl mounts but num_aces * sizeof(struct smb_ace) for mode_from_sid\nmounts: both paths can trigger the same rewrite and need the same\nheadroom.\n\nKASAN reports this as:\n  BUG: KASAN: slab-out-of-bounds in build_sec_desc+0x1e8a/0x2680 [cifs]\n  Write of size 4 at addr ffff8881a5e25374 by task chown/5298\n  ...\n  The buggy address is located 0 bytes to the right of\n   allocated 884-byte region [ffff8881a5e25000, ffff8881a5e25374)","score":8.8,"severity":"high","published":"2026-09-25T10:21:46.445Z","modified":"2026-10-30T12:37:19.991Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4","status":"affected","lessThan":"4e78b5ff13214353750b87283ff79f62510f5844","versionType":"git"},{"version":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4","status":"affected","lessThan":"63c2fbde15ffc9a0c21adf670c38d028e20fa65c","versionType":"git"},{"version":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4","status":"affected","lessThan":"d5cea6766ae1868a51c7d17d77d065b4f55c587f","versionType":"git"},{"version":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4","status":"affected","lessThan":"fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1","versionType":"git"},{"version":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4","status":"affected","lessThan":"7fa84c9ca690643f429ae2709584a47e74b572c9","versionType":"git"},{"version":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4","status":"affected","lessThan":"2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd","versionType":"git"},{"version":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4","status":"affected","lessThan":"0ee150794c75bcd0be0e24ff3394f433cbae18cc","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-97555"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.12","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-97555"}],"remediation":[],"references":["https://git.kernel.org/stable/c/4e78b5ff13214353750b87283ff79f62510f5844","https://git.kernel.org/stable/c/63c2fbde15ffc9a0c21adf670c38d028e20fa65c","https://git.kernel.org/stable/c/d5cea6766ae1868a51c7d17d77d065b4f55c587f","https://git.kernel.org/stable/c/fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1","https://git.kernel.org/stable/c/7fa84c9ca690643f429ae2709584a47e74b572c9","https://git.kernel.org/stable/c/2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd","https://git.kernel.org/stable/c/0ee150794c75bcd0be0e24ff3394f433cbae18cc"],"sources":[{"name":"CVE","id":"CVE-2026-97555","modified":"2026-10-30T12:37:19.991Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-97555"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8}],"sourceAffected":[],"observedAt":"2026-10-30T14:00:06.124Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:05:31.288Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}