{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-22038", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.809Z", "datePublished": "2025-04-16T14:11:56.316Z", "dateUpdated": "2026-08-05T11:56:11.103Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:56:11.103Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate zero num_subauth before sub_auth is accessed\n\nAccess psid->sub_auth[psid->num_subauth - 1] without checking\nif num_subauth is non-zero leads to an out-of-bounds read.\nThis patch adds a validation step to ensure num_subauth != 0\nbefore sub_auth is accessed." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "baseScore": 8.3, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445, and the malformed security descriptor is delivered entirely inside an SMB2 SET_INFO or CREATE request from a remote peer. No local access is required.\nAC:L - The attacker simply emits one SMB2 request containing an owner or group SID with num_subauth=0; parse_sid() explicitly permits that encoding and sid_to_id() is reached deterministically with no race, memory-layout, or timing dependency.\nPR:L - Both reachable paths require a completed SMB2 SESSION_SETUP, a writable TREE_CONNECT, and (for SET_INFO) an open file handle, so an ordinary authenticated share user is needed. This is not a pre-authentication path, but no administrative rights are required.\nUI:N - The attacker drives the entire sequence — session setup, tree connect, open, and the crafted set-security-descriptor request. No action by any local user or administrator is involved.\nS:U - The faulty read and its consequences stay inside the kernel's own security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - sid_to_id() reads memory preceding the declared sub_auth[] array and the resulting value is committed as the file's owner uid/gid, which the attacker can read straight back through an SMB2 QUERY_INFO security-descriptor request — a repeatable, remotely-observable disclosure oracle over out-of-bounds-indexed kernel buffer contents.\nI:L - A zero-subauth SID that the code intends to reject (the fix returns -EIO) is instead accepted, so notify_change() applies a uid/gid synthesized from misinterpreted bytes — an unintended modification of file ownership metadata, but not an arbitrary write or control-flow hijack.\nA:H - The negative-index dereference is an unchecked read outside the intended array bounds; on hardened or KASAN-enabled builds this is a fatal report, and the resulting bogus uid/gid chown corrupts share state. Any such kernel-side out-of-bounds access is treated as crash-capable." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/smbacl.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "3ac65de111c686c95316ade660f8ba7aea3cd3cc", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "0e36a3e080d6d8bd7a34e089345d043da4ac8283", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "56de7778a48560278c334077ace7b9ac4bfb2fd1", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "68c6c3142bfcdb049839d40a9a59ebe8ea865002", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "bf21e29d78cd2c2371023953d9c82dfef82ebb36", "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/server/smbacl.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.134", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.87", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.23", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13.11", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.2", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15", "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": "5.15", "versionEndExcluding": "6.1.134" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.87" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.23" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.13.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.14.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3ac65de111c686c95316ade660f8ba7aea3cd3cc" }, { "url": "https://git.kernel.org/stable/c/0e36a3e080d6d8bd7a34e089345d043da4ac8283" }, { "url": "https://git.kernel.org/stable/c/56de7778a48560278c334077ace7b9ac4bfb2fd1" }, { "url": "https://git.kernel.org/stable/c/68c6c3142bfcdb049839d40a9a59ebe8ea865002" }, { "url": "https://git.kernel.org/stable/c/c8bfe1954a0b89e7b29b3a3e7f4c5e0ebd295e20" }, { "url": "https://git.kernel.org/stable/c/bf21e29d78cd2c2371023953d9c82dfef82ebb36" } ], "title": "ksmbd: validate zero num_subauth before sub_auth is accessed", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-125", "lang": "en", "description": "CWE-125 Out-of-bounds Read" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.1, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2025-10-01T18:13:11.878668Z", "id": "CVE-2025-22038", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T18:13:16.440Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:41:20.321Z" } } ] } }