{"id":"CVE-2026-98167","state":"PUBLISHED","title":"smb: client: fix server->total_read for compound encrypted PDUs","description":"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.","publishedAt":"2026-10-06T08:44:12.731Z","updatedAt":"2026-10-19T09:14:58.765Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"8703539d22fdbc13dd2db090ee199c3a427b8ea0","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"e78fc1d240b27349b45a0f1c3e3c2c401d7e230d","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"a46eb242e9eef3a3897d166748b23303c516e870","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"282b72f9a7ef31296c48366db4128882999cc048","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"f73726b83e4756fdaa099e1bc1143293bd57ad79","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","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"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"]}],"references":["https://git.kernel.org/stable/c/8703539d22fdbc13dd2db090ee199c3a427b8ea0","https://git.kernel.org/stable/c/e78fc1d240b27349b45a0f1c3e3c2c401d7e230d","https://git.kernel.org/stable/c/a46eb242e9eef3a3897d166748b23303c516e870","https://git.kernel.org/stable/c/ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3","https://git.kernel.org/stable/c/282b72f9a7ef31296c48366db4128882999cc048","https://git.kernel.org/stable/c/f73726b83e4756fdaa099e1bc1143293bd57ad79"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98167.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98167","state":"PUBLISHED","datePublished":"2026-10-06T08:44:12.731Z","dateUpdated":"2026-10-19T09:14:58.765Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.321Z"},"containers":{"cna":{"title":"smb: client: fix server->total_read for compound encrypted PDUs","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"8703539d22fdbc13dd2db090ee199c3a427b8ea0","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"e78fc1d240b27349b45a0f1c3e3c2c401d7e230d","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"a46eb242e9eef3a3897d166748b23303c516e870","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"ebb8a075fdc7af3d196a4f158a0e18dbc394c0e3","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"282b72f9a7ef31296c48366db4128882999cc048","versionType":"git"},{"version":"b24df3e30cbf48255db866720fb71f14bf9d2f39","status":"affected","lessThan":"f73726b83e4756fdaa099e1bc1143293bd57ad79","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","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"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/smb2ops.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:14:58.765Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}