{"id":"CVE-2026-43239","state":"PUBLISHED","title":"smb: client: prevent races in ->query_interfaces()","description":"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 checking and updating iface_last_update under\niface_lock.","publishedAt":"2026-05-06T11:28:33.623Z","updatedAt":"2026-10-30T12:25:14.475Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"de3c1653510d566a245cc54ac4bb9e50ebc5faa8","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"93e8e3ee165ae4609a1222b516b573837103d2c3","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"ab6564f416a6eaf1199200b6100952407b438f7d","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"6287eefaf21ec805d42f941bd368018cf397a7f5","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"76cc4faba0343c6db945b8dc75425b33d633e1b8","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"c3c06e42e1527716c54f3ad2ced6a034b5f3a489","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":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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/de3c1653510d566a245cc54ac4bb9e50ebc5faa8","https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3","https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d","https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5","https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8","https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-30T12:42:04.495Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43239.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43239","state":"PUBLISHED","datePublished":"2026-05-06T11:28:33.623Z","dateUpdated":"2026-10-30T12:25:14.475Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.995Z"},"containers":{"cna":{"title":"smb: client: prevent races in ->query_interfaces()","descriptions":[{"lang":"en","value":"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 checking and updating iface_last_update under\niface_lock."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"de3c1653510d566a245cc54ac4bb9e50ebc5faa8","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"93e8e3ee165ae4609a1222b516b573837103d2c3","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"ab6564f416a6eaf1199200b6100952407b438f7d","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"6287eefaf21ec805d42f941bd368018cf397a7f5","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"76cc4faba0343c6db945b8dc75425b33d633e1b8","versionType":"git"},{"version":"aa45dadd34e44fcd6a9df4b395bee5b5633b4cec","status":"affected","lessThan":"c3c06e42e1527716c54f3ad2ced6a034b5f3a489","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":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.128","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.75","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.16","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.6","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","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/de3c1653510d566a245cc54ac4bb9e50ebc5faa8"},{"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"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable SMB client code processes FSCTL_QUERY_NETWORK_INTERFACE_INFO responses supplied by a remote SMB server over the network.\nAC:L - The required SMB3/multichannel capability and response timing can be controlled by a malicious server, and concurrent interface queries can be induced through normal mounted-session refresh/reconnect behavior.\nPR:N - The attacker needs no privileges on the victim system; a malicious or compromised SMB server can supply the responses once the client connects.\nUI:R - Exploitation requires the victim system or user to mount/connect to the SMB share, which is user interaction under the provided guidance.\nS:U - The impact is within the client kernel that contains the vulnerable SMB client component, without crossing a separate security authority such as a VM boundary.\nC:H - The race can corrupt the kernel-maintained cifs_server_iface linked list/refcount state, and kernel heap/list corruption is defensibly treated as potentially exposing arbitrary kernel memory.\nI:H - The same kernel list corruption can plausibly be leveraged beyond a simple fault into kernel memory corruption or code execution, so integrity impact is high under the required higher-severity rule.\nA:H - Even without full exploitation, the race can corrupt interface-list state and trigger kernel oops/panic or hang in the SMB client path."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:25:14.475Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.128"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-43239","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:16:00.528244Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:16:25.161Z"}}]}}}