CVE-2026-98167

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98167", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.321Z", "datePublished": "2026-10-06T08:44:12.731Z", "dateUpdated": "2026-10-19T09:14:58.765Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:14:58.765Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix server->total_read for compound encrypted PDUs\n\nIn receive_encrypted_standard(), server->total_read is left at the\nfull decrypted frame size when walking sub-PDUs of a compound encrypted\nframe. As a result, cifs_handle_standard() passes this full size\nto smb2_check_message(), causing the PDU length guards to incorrectly\nvalidate the entire compound frame instead of the current sub-PDU.\n\nThis allows truncated non-last sub-PDUs to bypass length validation,\nleading to out-of-bounds reads in smb2_get_data_area_len().\n\nFix this by setting server->total_read to the true length of the\ncurrent sub-PDU: next_cmd for non-last sub-PDUs, and the remaining\npdu_length for the last one."}], "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": "8703539d22fdbc13dd2db090ee199c3a427b8ea0", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "e78fc1d240b27349b45a0f1c3e3c2c401d7e230d", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "a46eb242e9eef3a3897d166748b23303c516e870", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "282b72f9a7ef31296c48366db4128882999cc048", "status": "affected", "versionType": "git"}, {"version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "lessThan": "f73726b83e4756fdaa099e1bc1143293bd57ad79", "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", "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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0"}, {"url": "https://git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230d"}, {"url": "https://git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870"}, {"url": "https://git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3"}, {"url": "https://git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048"}, {"url": "https://git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79"}], "title": "smb: client: fix server->total_read for compound encrypted 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": "8703539d22fdbc13dd2db090ee199c3a427b8ea0", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "e78fc1d240b27349b45a0f1c3e3c2c401d7e230d", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "a46eb242e9eef3a3897d166748b23303c516e870", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "282b72f9a7ef31296c48366db4128882999cc048", "status": "affected", "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39", "versionType": "git"}, {"lessThan": "f73726b83e4756fdaa099e1bc1143293bd57ad79", "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", "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 server->total_read for compound encrypted PDUs\n\nIn receive_encrypted_standard(), server->total_read is left at the\nfull decrypted frame size when walking sub-PDUs of a compound encrypted\nframe. As a result, cifs_handle_standard() passes this full size\nto smb2_check_message(), causing the PDU length guards to incorrectly\nvalidate the entire compound frame instead of the current sub-PDU.\n\nThis allows truncated non-last sub-PDUs to bypass length validation,\nleading to out-of-bounds reads in smb2_get_data_area_len().\n\nFix this by setting server->total_read to the true length of the\ncurrent sub-PDU: next_cmd for non-last sub-PDUs, and the remaining\npdu_length for the last one."}], "id": "CVE-2026-98167", "lastModified": "2026-10-19T10:18:16.950", "metrics": {}, "published": "2026-10-06T09:17:58.177", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: smb: client: fix server->total_read for compound encrypted PDUs", "id": "2546525", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2546525"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's SMB client. When processing compound encrypted Protocol Data Units (PDUs), the client incorrectly validates the length of individual messages within the compound frame. A malicious or compromised SMB server can exploit this flaw by returning truncated sub-PDUs, triggering an out-of-bounds read during response handling. This vulnerability primarily results in a system crash and Denial of Service (DoS), or potentially the disclosure of sensitive kernel memory."], "name": "CVE-2026-98167", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98167\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98167\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98167.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,8703539d22fdbc13dd2db090ee199c3a427b8ea0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,e78fc1d240b27349b45a0f1c3e3c2c401d7e230d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,a46eb242e9eef3a3897d166748b23303c516e870)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,282b72f9a7ef31296c48366db4128882999cc048)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b24df3e30cbf48255db866720fb71f14bf9d2f39,f73726b83e4756fdaa099e1bc1143293bd57ad79)"}}], "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": "semver", "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": "2026-10-06T13:15:15.868600+00:00", "updated": "2026-10-07T07:45:14.224971+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}