{"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"}}]}}