{"id":"CVE-2026-99083","aliases":[],"cve":{"records":[{"id":"CVE-2026-99083","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.390Z","published":"2026-10-23T12:45:01.735Z","modified":"2026-10-30T12:41:38.581Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:41:38.581Z"}],"references":[{"url":"https://git.kernel.org/stable/c/a07dfb33112a42437f9d2d0bfd35c68575257381","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/1f73a6d40f4d1bae4f3491c0ec1ea8ee6ce035ff","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/59c6dcc5dd9dafe764ca0d40525933b2be69b059","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/517404e157395d0f8da125ca956c566895dfcd06","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/4722d06b2907585074252061b1024a696c1cfc23","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/23a0be6a84a38ac169eeab49017934e8e27c65f0","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.145","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.40","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.18.58"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"7.2.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.5"}]}]}]}],"prioritization":[]},"title":"ksmbd: fix heap out-of-bounds write in krb5_authenticate()","titleSource":"Linux","descriptionSource":"Linux","description":"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.","score":8.8,"severity":"high","published":"2026-10-23T12:45:01.735Z","modified":"2026-10-30T12:41:38.581Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"676392184785ace61e939831e7ca44a03d438c3b","status":"affected","lessThan":"a07dfb33112a42437f9d2d0bfd35c68575257381","versionType":"git"},{"version":"ef572ffa8eb44111eed2925fbb2adca78bdcbf61","status":"affected","lessThan":"1f73a6d40f4d1bae4f3491c0ec1ea8ee6ce035ff","versionType":"git"},{"version":"98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8","status":"affected","lessThan":"59c6dcc5dd9dafe764ca0d40525933b2be69b059","versionType":"git"},{"version":"98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8","status":"affected","lessThan":"80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a","versionType":"git"},{"version":"98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8","status":"affected","lessThan":"517404e157395d0f8da125ca956c566895dfcd06","versionType":"git"},{"version":"98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8","status":"affected","lessThan":"4722d06b2907585074252061b1024a696c1cfc23","versionType":"git"},{"version":"98422bdd4cb3ca4d08844046f6507d7ec2c2b8d8","status":"affected","lessThan":"23a0be6a84a38ac169eeab49017934e8e27c65f0","versionType":"git"},{"version":"2ba03cecb12ac7ac9e0170e251543c56832d9959","status":"affected","versionType":"git"},{"version":"5.15.145","status":"affected","lessThan":"5.15.224","versionType":"semver"},{"version":"6.1.40","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"6.4.5","status":"affected","lessThan":"6.5","versionType":"semver"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99083"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.58","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.12","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99083"}],"remediation":[],"references":["https://git.kernel.org/stable/c/a07dfb33112a42437f9d2d0bfd35c68575257381","https://git.kernel.org/stable/c/1f73a6d40f4d1bae4f3491c0ec1ea8ee6ce035ff","https://git.kernel.org/stable/c/59c6dcc5dd9dafe764ca0d40525933b2be69b059","https://git.kernel.org/stable/c/80af1bde97d5a85ad6f2c40ca894ccc8fa75a27a","https://git.kernel.org/stable/c/517404e157395d0f8da125ca956c566895dfcd06","https://git.kernel.org/stable/c/4722d06b2907585074252061b1024a696c1cfc23","https://git.kernel.org/stable/c/23a0be6a84a38ac169eeab49017934e8e27c65f0"],"sources":[{"name":"CVE","id":"CVE-2026-99083","modified":"2026-10-30T12:41:38.581Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99083"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8}],"sourceAffected":[],"observedAt":"2026-10-30T13:11:52.856Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T00:10:33.488Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}