{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98171", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.322Z", "datePublished": "2026-10-06T08:44:15.927Z", "dateUpdated": "2026-10-06T08:44:15.927Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-06T08:44:15.927Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "72eaef1f37a3b6bec11c342736834dc3707be3e4", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "491e33144dee872cffda207f6fcb09260728f803", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "8749946579708ea0d339034bb7f423a67dbe89cf", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "96c436e4b010711452b2872558938f4ef276492a", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "858d5ac22cb889266993e7670f9f0c4f4aeedd78", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "05762c5bc1cfdcac36747994fde2c04387a457f1", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "4.19", "status": "affected"}, {"version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"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-rc4"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4"}, {"url": "https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803"}, {"url": "https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf"}, {"url": "https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a"}, {"url": "https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78"}, {"url": "https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1"}], "title": "smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/client/smb2ops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "72eaef1f37a3b6bec11c342736834dc3707be3e4", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "491e33144dee872cffda207f6fcb09260728f803", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "8749946579708ea0d339034bb7f423a67dbe89cf", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "96c436e4b010711452b2872558938f4ef276492a", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "858d5ac22cb889266993e7670f9f0c4f4aeedd78", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "05762c5bc1cfdcac36747994fde2c04387a457f1", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/client/smb2ops.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.19"}, {"lessThan": "4.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.54", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc4", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-98171", "lastModified": "2026-10-06T09:17:58.773", "metrics": {}, "published": "2026-10-06T09:17:58.773", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,72eaef1f37a3b6bec11c342736834dc3707be3e4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,491e33144dee872cffda207f6fcb09260728f803)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,8749946579708ea0d339034bb7f423a67dbe89cf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,96c436e4b010711452b2872558938f4ef276492a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,858d5ac22cb889266993e7670f9f0c4f4aeedd78)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,05762c5bc1cfdcac36747994fde2c04387a457f1)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.189,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.158,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.112,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.54,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.8,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-06T11:45:17.781714+00:00", "updated": "2026-10-06T13:15:15.867086+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-190"]}