{"id":"CVE-2026-43239","title":"smb: client: prevent races in ->query_interfaces()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: prevent races in ->query_interfaces()\n\nIt was possible for two query interface works to be concurrently trying\nto update the interfaces.\n\nPrevent this by c…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-821"],"vendor":"Linux","product":"Linux","affected":["Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 93e8e3ee165ae4609a1222b516b573837103d2c3","Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < ab6564f416a6eaf1199200b6100952407b438f7d","Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 6287eefaf21ec805d42f941bd368018cf397a7f5","Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 76cc4faba0343c6db945b8dc75425b33d633e1b8","Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < c3c06e42e1527716c54f3ad2ced6a034b5f3a489","Linux 5.19"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:16:00.528244Z"},"published":"2026-05-06","updated":"2026-10-19","sourceUpdated":"2026-10-19T19:16:25.161Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43239","references":[{"url":"https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3"},{"url":"https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d"},{"url":"https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5"},{"url":"https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8"},{"url":"https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43239.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-43239"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2467195"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43239"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43239"},{"url":"https://lore.kernel.org/linux-cve-announce/2026050659-CVE-2026-43239-f862@gregkh/T"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00273,"epssPercentile":0.19596,"scores":{"cna":8.8,"vendor":6.5},"ingestedAt":"2026-10-16T17:24:46.689Z","slug":"CVE-2026-43239","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: prevent races in ->query_interfaces()\n\nIt was possible for two query interface works to be concurrently trying\nto update the interfaces.\n\nPrevent this by checking and updating iface_last_update under\niface_lock.\n\n## Affected\n\n- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 93e8e3ee165ae4609a1222b516b573837103d2c3`\n- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < ab6564f416a6eaf1199200b6100952407b438f7d`\n- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 6287eefaf21ec805d42f941bd368018cf397a7f5`\n- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 76cc4faba0343c6db945b8dc75425b33d633e1b8`\n- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < c3c06e42e1527716c54f3ad2ced6a034b5f3a489`\n- `Linux 5.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43239.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":225121,"id":"CVE-2026-43239","ts":1792438760615,"field":"cvss","old":"6.5","new":"8.8"},{"seq":225120,"id":"CVE-2026-43239","ts":1792438760615,"field":"severity","old":"medium","new":"high"},{"seq":223584,"id":"CVE-2026-43239","ts":1792238324951,"field":"cvss","old":"8.8","new":"6.5"},{"seq":223583,"id":"CVE-2026-43239","ts":1792238324951,"field":"severity","old":"high","new":"medium"}]}