{"api_version":"1","generated_at":"2026-04-23T07:57:16+00:00","cve":"CVE-2026-31478","urls":{"html":"https://cve.report/CVE-2026-31478","api":"https://cve.report/api/cve/CVE-2026-31478.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31478","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31478"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-04-22 14:16:44","updated_at":"2026-04-22 14:16:44"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d","name":"https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb","name":"https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1","name":"https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861","name":"https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361","name":"https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5","name":"https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683","name":"https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31478","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31478","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f2283680a80571ca82d710bc6ecd8f8beac67d63 70b4c414889492c522b6e4331562360f49be2361 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 9a7166f0ef8cbb7bb48dd05e2471d995566003f5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 6aef1765d6807e0f027cd87f6ac973eb0879a46d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 80824c7e527b70cf9039534e60aff592e8f209d1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 4cb537ae4f37d7d0f617815ed4bed7173fb50861 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d 0e55f63dd08f09651d39e1b709a91705a8a0ddcb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.131 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.80 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.21 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.11 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/server/smb2pdu.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"70b4c414889492c522b6e4331562360f49be2361","status":"affected","version":"f2283680a80571ca82d710bc6ecd8f8beac67d63","versionType":"git"},{"lessThan":"9a7166f0ef8cbb7bb48dd05e2471d995566003f5","status":"affected","version":"9f297df20d93411c0b4ddad7f88ba04a7cd36e77","versionType":"git"},{"lessThan":"c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683","status":"affected","version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","versionType":"git"},{"lessThan":"6aef1765d6807e0f027cd87f6ac973eb0879a46d","status":"affected","version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","versionType":"git"},{"lessThan":"80824c7e527b70cf9039534e60aff592e8f209d1","status":"affected","version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","versionType":"git"},{"lessThan":"4cb537ae4f37d7d0f617815ed4bed7173fb50861","status":"affected","version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","versionType":"git"},{"lessThan":"0e55f63dd08f09651d39e1b709a91705a8a0ddcb","status":"affected","version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/server/smb2pdu.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.6"},{"lessThan":"6.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.131","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.80","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.21","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"5.15.145","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"6.1.71","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.131","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.80","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.21","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.11","versionStartIncluding":"6.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"6.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-04-22T13:54:06.157Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/70b4c414889492c522b6e4331562360f49be2361"},{"url":"https://git.kernel.org/stable/c/9a7166f0ef8cbb7bb48dd05e2471d995566003f5"},{"url":"https://git.kernel.org/stable/c/c3a89e3ec1ccf64fa6a34e391e1581ebbcba8683"},{"url":"https://git.kernel.org/stable/c/6aef1765d6807e0f027cd87f6ac973eb0879a46d"},{"url":"https://git.kernel.org/stable/c/80824c7e527b70cf9039534e60aff592e8f209d1"},{"url":"https://git.kernel.org/stable/c/4cb537ae4f37d7d0f617815ed4bed7173fb50861"},{"url":"https://git.kernel.org/stable/c/0e55f63dd08f09651d39e1b709a91705a8a0ddcb"}],"title":"ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31478","datePublished":"2026-04-22T13:54:06.157Z","dateReserved":"2026-03-09T15:48:24.098Z","dateUpdated":"2026-04-22T13:54:06.157Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-22 14:16:44","lastModifiedDate":"2026-04-22 14:16:44","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31478","Ordinal":"1","Title":"ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_m","CVE":"CVE-2026-31478","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31478","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_m"}]}}}