{"schema":"threatline.record/2","record":{"id":"CVE-2026-99083","aliases":[],"summary":"ksmbd: fix heap out-of-bounds write in krb5_authenticate()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix heap out-of-bounds write in krb5_authenticate()\n\nIn krb5_authenticate(), out_len is calculated to determine available\nheadroom in response_buf for the incoming Kerberos AP-REP token. However,\nwhen SMB2_SESSION_SETUP is processed as a non-first element of a compounded\nSMB2 request, the calculation omits work->next_smb2_rsp_hdr_off.\n\nThis causes out_len to overstate remaining buffer headroom by\nthe cumulative size of prior responses in the compound chain. Consequently,\nthe length check in ksmbd_krb5_authenticate()\n(*out_len <= resp->spnego_blob_len) passes erroneously, allowing memcpy()\nto write the AP-REP blob past the end of response_buf into adjacent kernel\nheap memory.\n\nFix this by subtracting work->next_smb2_rsp_hdr_off when computing out_len,\nensuring it accurately reflects physical remaining buffer space.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"59c6dcc5dd9dafe764ca0d40525933b2be69b059","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"517404e157395d0f8da125ca956c566895dfcd06","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"4722d06b2907585074252061b1024a696c1cfc23","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"23a0be6a84a38ac169eeab49017934e8e27c65f0","status":"affected","versionType":"git"},{"version":"0","lessThan":"6.6.160","status":"affected","versionType":"semver"},{"version":"0","lessThan":"6.12.114","status":"affected","versionType":"semver"},{"version":"0","lessThan":"6.18.58","status":"affected","versionType":"semver"},{"version":"0","lessThan":"7.2.12","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.114","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.58","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.12","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"59c6dcc5dd9dafe764ca0d40525933b2be69b059","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"517404e157395d0f8da125ca956c566895dfcd06","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"4722d06b2907585074252061b1024a696c1cfc23","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"23a0be6a84a38ac169eeab49017934e8e27c65f0","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.6.160","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.12.114","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"6.18.58","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","source_modified_at":"2026-10-23T12:45:01.735Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"7.2.12","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:45:01.735Z","modified_at":"2026-10-23T12:45:01.735Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99083","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:45:01.735Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/59c6dcc5dd9dafe764ca0d40525933b2be69b059"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/517404e157395d0f8da125ca956c566895dfcd06"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4722d06b2907585074252061b1024a696c1cfc23"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/23a0be6a84a38ac169eeab49017934e8e27c65f0"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:45:01.735Z","content_hash":"d90bf917f0159671e063d38dc3f8bc44ee35640c76c7c19fc46d133e09a1ffb6"}}