CVE-2026-97555

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-97555", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-24T16:01:01.154Z", "datePublished": "2026-09-25T10:21:46.445Z", "dateUpdated": "2026-10-30T12:37:19.991Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:37:19.991Z"}, "descriptions": [{"lang": "en", "value": "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)"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - chown/chgrp reaches id_mode_to_cifs_acl via cifs_setattr_nounix, which fetches the NTSD through get_smb2_acl \u2192 SMB2_query_acl (SMB2 QUERY_INFO, InfoType=SMB2_O_INFO_SECURITY). The DACL that undersizes the kzalloc (dacl_ptr->size and short ACE SIDs) is that response body from a remote SMB server on TCP/445.\nAC:L - After setattr hits id_mode_to_cifs_acl's chown branch, overflow is deterministic: the server returns 1-sub-authority owner ACEs so dacl_ptr->size is compact, while idsfromsid builds a 3-sub-authority S-1-5-88 SID and id_to_sid() can return up to 15, and replace_sids_and_copy_aces/cifs_copy_ace writes the expanded ACEs with no race.\nPR:N - The attacker is the SMB server answering SMB2_query_acl on the existing tree-connect and holds no uid, share credential, or capability on the client. Local chown_ok/CAP_CHOWN belongs to the victim who issues chown/chgrp, not to the server.\nUI:R - The overflowing allocation is only in id_mode_to_cifs_acl's ATTR_UID/ATTR_GID (chown/chgrp) branch from cifs_setattr_nounix, so a user must chown(2) or chgrp(2) a file on a cifsacl, modefromsid, or posix_extensions CIFS mount of the attacker's share; lookup/stat/read never rewrite that DACL.\nS:U - The overflow is of the kmalloc'd pnntsd buffer inside id_mode_to_cifs_acl/build_sec_desc on the CIFS client host and stays in that kernel's own authority; it is not a VM, IOMMU, or sandbox escape.\nC:H - replace_sids_and_copy_aces heap-overflows pnntsd in build_sec_desc (KASAN slab-out-of-bounds write of expanded ACE/SID bytes). Corrupting neighboring slab objects is a kernel-memory disclosure primitive, so confidentiality is High.\nI:H - cifs_copy_ace writes server-chosen ACE type/flags/access_req and a longer SID past the end of id_mode_to_cifs_acl's kzalloc buffer, an out-of-bounds heap write that can corrupt adjacent objects and hijack control flow.\nA:H - The same out-of-bounds write in build_sec_desc was reported as KASAN slab-out-of-bounds by task chown and can oops or panic the client kernel, fully denying availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/cifsacl.c"], "versions": [{"version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "lessThan": "4e78b5ff13214353750b87283ff79f62510f5844", "status": "affected", "versionType": "git"}, {"version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "lessThan": "63c2fbde15ffc9a0c21adf670c38d028e20fa65c", "status": "affected", "versionType": "git"}, {"version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "lessThan": "d5cea6766ae1868a51c7d17d77d065b4f55c587f", "status": "affected", "versionType": "git"}, {"version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "lessThan": "fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1", "status": "affected", "versionType": "git"}, {"version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "lessThan": "7fa84c9ca690643f429ae2709584a47e74b572c9", "status": "affected", "versionType": "git"}, {"version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "lessThan": "2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd", "status": "affected", "versionType": "git"}, {"version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "lessThan": "0ee150794c75bcd0be0e24ff3394f433cbae18cc", "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/smb/client/cifsacl.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4e78b5ff13214353750b87283ff79f62510f5844"}, {"url": "https://git.kernel.org/stable/c/63c2fbde15ffc9a0c21adf670c38d028e20fa65c"}, {"url": "https://git.kernel.org/stable/c/d5cea6766ae1868a51c7d17d77d065b4f55c587f"}, {"url": "https://git.kernel.org/stable/c/fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1"}, {"url": "https://git.kernel.org/stable/c/7fa84c9ca690643f429ae2709584a47e74b572c9"}, {"url": "https://git.kernel.org/stable/c/2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd"}, {"url": "https://git.kernel.org/stable/c/0ee150794c75bcd0be0e24ff3394f433cbae18cc"}], "title": "smb: client: fix heap overflow in DACL owner/group rewrite", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/cifsacl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4e78b5ff13214353750b87283ff79f62510f5844", "status": "affected", "version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "versionType": "git"}, {"lessThan": "63c2fbde15ffc9a0c21adf670c38d028e20fa65c", "status": "affected", "version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "versionType": "git"}, {"lessThan": "d5cea6766ae1868a51c7d17d77d065b4f55c587f", "status": "affected", "version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "versionType": "git"}, {"lessThan": "fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1", "status": "affected", "version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "versionType": "git"}, {"lessThan": "7fa84c9ca690643f429ae2709584a47e74b572c9", "status": "affected", "version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "versionType": "git"}, {"lessThan": "2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd", "status": "affected", "version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "versionType": "git"}, {"lessThan": "0ee150794c75bcd0be0e24ff3394f433cbae18cc", "status": "affected", "version": "bc3e9dd9d104ca1b75644eab87b38ce8a924aef4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/cifsacl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"lessThan": "5.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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)"}], "id": "CVE-2026-97555", "lastModified": "2026-10-30T13:21:07.520", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-25T11:17:05.963", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0ee150794c75bcd0be0e24ff3394f433cbae18cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4e78b5ff13214353750b87283ff79f62510f5844"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63c2fbde15ffc9a0c21adf670c38d028e20fa65c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7fa84c9ca690643f429ae2709584a47e74b572c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d5cea6766ae1868a51c7d17d77d065b4f55c587f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: smb: client: fix heap overflow in DACL owner/group rewrite", "id": "2541166", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541166"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsmb: client: fix heap overflow in DACL owner/group rewrite\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)).\nIf the original DACL contains short SIDs (e.g., 1 sub-authority) while\nthe replacement SIDs are long, the rewritten ACEs overflow the\nallocation.\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.\nKASAN reports this as:\nBUG: KASAN: slab-out-of-bounds in build_sec_desc+0x1e8a/0x2680 [cifs]\nWrite of size 4 at addr ffff8881a5e25374 by task chown/5298\n...\nThe buggy address is located 0 bytes to the right of\nallocated 884-byte region [ffff8881a5e25000, ffff8881a5e25374)", "A flaw was found in the Linux kernel's SMB client. When rewriting a Discretionary Access Control List (DACL) during file ownership updates, the kernel allocates memory based on the original identifier lengths rather than accounting for larger replacement Security Identifiers (SIDs). A local user can exploit this vulnerability by modifying file attributes on a mounted SMB share, triggering a heap-based buffer overflow that may lead to a Denial of Service (DoS) or potential privilege escalation."], "name": "CVE-2026-97555", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97555\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97555\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97555.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc3e9dd9d104ca1b75644eab87b38ce8a924aef4,fb736ab4fb8c4fdb8b2f9ccd3a62e03d11549ca1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc3e9dd9d104ca1b75644eab87b38ce8a924aef4,7fa84c9ca690643f429ae2709584a47e74b572c9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc3e9dd9d104ca1b75644eab87b38ce8a924aef4,2a9aee9ef5622d58d8aafaa3263b3ffe70e2d9dd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc3e9dd9d104ca1b75644eab87b38ce8a924aef4,0ee150794c75bcd0be0e24ff3394f433cbae18cc)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T13:15:07.881314+00:00", "updated": "2026-10-01T12:15:05.363343+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}