{"id":"CVE-2026-31478","revision":null,"records":[{"revision":"a9a0e2aa8c0942b08461c6102a824b18","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31478","aliases":[],"title":"ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()\n\nAfter this commit (e2b76ab8b5c9 \"ksmbd: add support for read compound\"),\nresponse buffer management was changed to use dynamic iov array.\nIn the new design, smb2_calc_max_out_buf_len() expects the second\nargument (hdr2_len) to be the offset of ->Buffer field in the\nresponse structure, not a hardcoded magic number.\nFix the remaining call sites to use the correct offsetof() value.","state":0,"publishedAt":"2026-04-22T13:54:06.157+00:00","modifiedAt":"2026-10-19T18:45:53.152+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/smb/server/smb2pdu.c\"\n ],\n \"versions\": [\n {\n \"version\": \"f2283680a80571ca82d710bc6ecd8f8beac67d63\",\n \"lessThan\": \"70b4c414889492c522b6e4331562360f49be2361\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"9f297df20d93411c0b4ddad7f88ba04a7cd36e77\",\n \"lessThan\": \"9a7166f0ef8cbb7bb48dd05e2471d995566003f5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"6aef1765d6807e0f027cd87f6ac973eb0879a46d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"80824c7e527b70cf9039534e60aff592e8f209d1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"4cb537ae4f37d7d0f617815ed4bed7173fb50861\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"0e55f63dd08f09651d39e1b709a91705a8a0ddcb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.15.145\",\n \"lessThan\": \"5.15.203\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.71\",\n \"lessThan\": \"6.1.168\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/smb/server/smb2pdu.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.6\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.6\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.203\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.168\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.131\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.80\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.21\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.11\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361","https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5","https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683","https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d","https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1","https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861","https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31478","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31478","identifiers":["CVE-2026-31478"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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