{"id":"CVE-2026-98171","aliases":[],"cve":{"records":[{"id":"CVE-2026-98171","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.322Z","published":"2026-10-06T08:44:15.927Z","modified":"2026-10-30T12:37:50.015Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:37:50.015Z"}],"references":[{"url":"https://git.kernel.org/stable/c/1ed29f7a03417b405f38c09cfe04124883127b53","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/7f022867ec9f0166a0b4400385bb601b1c6b2c75","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1","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":"4.19","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.2.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs\n\nFix several related bounds checking and pointer lifecycle issues in\nreceive_encrypted_standard()'s handling of compound encrypted frames:\n\n- Clear next_buffer after assigning it to server->bigbuf. A stale\n  next_buffer pointer can lead to a use-after-free on subsequent\n  error paths.\n- Update pdu_length to the decrypted plaintext size (buf_size). Using\n  the pre-decryption length allows NextCommand to point into stale\n  ciphertext residue.\n- Reject next_cmd values smaller than MID_HEADER_SIZE(server).\n- Fix an integer overflow in the upper bound check by verifying\n  pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the\n  trailing slice is large enough for a header.","score":8.8,"severity":"high","published":"2026-10-06T08:44:15.927Z","modified":"2026-10-30T12:37:50.015Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"1ed29f7a03417b405f38c09cfe04124883127b53","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"7f022867ec9f0166a0b4400385bb601b1c6b2c75","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"72eaef1f37a3b6bec11c342736834dc3707be3e4","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"491e33144dee872cffda207f6fcb09260728f803","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"8749946579708ea0d339034bb7f423a67dbe89cf","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"96c436e4b010711452b2872558938f4ef276492a","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"858d5ac22cb889266993e7670f9f0c4f4aeedd78","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"05762c5bc1cfdcac36747994fde2c04387a457f1","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98171"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.54","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.8","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-2026-98171"}],"remediation":[],"references":["https://git.kernel.org/stable/c/1ed29f7a03417b405f38c09cfe04124883127b53","https://git.kernel.org/stable/c/7f022867ec9f0166a0b4400385bb601b1c6b2c75","https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4","https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803","https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf","https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a","https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78","https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1"],"sources":[{"name":"CVE","id":"CVE-2026-98171","modified":"2026-10-30T12:37:50.015Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-98171"}],"assessments":[{"source":"Linux","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8}],"sourceAffected":[],"observedAt":"2026-10-30T14:00:53.649Z","kev":{"status":"not-listed","checkedAt":"2026-11-14T23:35:33.875Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":null}