{"api_version":"1","generated_at":"2026-07-20T14:42:32+00:00","cve":"CVE-2026-64137","urls":{"html":"https://cve.report/CVE-2026-64137","api":"https://cve.report/api/cve/CVE-2026-64137.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64137","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64137"},"summary":{"title":"smb: client: require net admin for CIFS SWN netlink","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: require net admin for CIFS SWN netlink\n\nCIFS_GENL_CMD_SWN_NOTIFY is the userspace witness-notify command.  The\nintended sender is the cifs.witness helper, but the generic-netlink\noperation currently has no capability flag, so any local process can send\nRESOURCE_CHANGE or CLIENT_MOVE notifications to the in-kernel witness\nhandler.\n\nThe same family exposes CIFS_GENL_MCGRP_SWN without multicast-group\ncapability flags.  Register messages sent to that group include the witness\nregistration id and, for NTLM-authenticated mounts, the username, domain,\nand password attributes copied from the CIFS session.  An unprivileged\nlocal process should not be able to join that group and receive those\nmessages.\n\nRequire CAP_NET_ADMIN for incoming SWN_NOTIFY commands with\nGENL_ADMIN_PERM, and require CAP_NET_ADMIN over the network namespace for\njoining the SWN multicast group with GENL_MCAST_CAP_NET_ADMIN.  The\ncifs.witness service runs with the privileges needed for both operations.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:55","updated_at":"2026-07-19 16:17:55"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a3238b09c58f323e40743ce174cd0ab81b5c09ed","name":"https://git.kernel.org/stable/c/a3238b09c58f323e40743ce174cd0ab81b5c09ed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a8d17d22db591099519a89f14dd24810daba74c3","name":"https://git.kernel.org/stable/c/a8d17d22db591099519a89f14dd24810daba74c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9cf7eb8919344932f909b2fac76296f7656fda8d","name":"https://git.kernel.org/stable/c/9cf7eb8919344932f909b2fac76296f7656fda8d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c2397b93fbb6f44a788fff30f99be2c20cc5e50f","name":"https://git.kernel.org/stable/c/c2397b93fbb6f44a788fff30f99be2c20cc5e50f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/969bc6370334a5b4720c5470783295d6484bbc95","name":"https://git.kernel.org/stable/c/969bc6370334a5b4720c5470783295d6484bbc95","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9919021a3b7974ae66a5f9915e3a48c10cfd409b","name":"https://git.kernel.org/stable/c/9919021a3b7974ae66a5f9915e3a48c10cfd409b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d1ebfce2c1d161186a82e77590bf7da2ea1bce91","name":"https://git.kernel.org/stable/c/d1ebfce2c1d161186a82e77590bf7da2ea1bce91","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64137","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64137","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 9cf7eb8919344932f909b2fac76296f7656fda8d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 9919021a3b7974ae66a5f9915e3a48c10cfd409b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 969bc6370334a5b4720c5470783295d6484bbc95 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 a3238b09c58f323e40743ce174cd0ab81b5c09ed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 a8d17d22db591099519a89f14dd24810daba74c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 c2397b93fbb6f44a788fff30f99be2c20cc5e50f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 d1ebfce2c1d161186a82e77590bf7da2ea1bce91 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.11","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.92 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/smb/client/netlink.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"9cf7eb8919344932f909b2fac76296f7656fda8d","status":"affected","version":"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8","versionType":"git"},{"lessThan":"9919021a3b7974ae66a5f9915e3a48c10cfd409b","status":"affected","version":"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8","versionType":"git"},{"lessThan":"969bc6370334a5b4720c5470783295d6484bbc95","status":"affected","version":"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8","versionType":"git"},{"lessThan":"a3238b09c58f323e40743ce174cd0ab81b5c09ed","status":"affected","version":"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8","versionType":"git"},{"lessThan":"a8d17d22db591099519a89f14dd24810daba74c3","status":"affected","version":"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8","versionType":"git"},{"lessThan":"c2397b93fbb6f44a788fff30f99be2c20cc5e50f","status":"affected","version":"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8","versionType":"git"},{"lessThan":"d1ebfce2c1d161186a82e77590bf7da2ea1bce91","status":"affected","version":"fed979a7e082bd9f25f9002c3c4f8740dacd0bc8","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/smb/client/netlink.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.11"},{"lessThan":"5.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.92","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.92","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"5.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: require net admin for CIFS SWN netlink\n\nCIFS_GENL_CMD_SWN_NOTIFY is the userspace witness-notify command.  The\nintended sender is the cifs.witness helper, but the generic-netlink\noperation currently has no capability flag, so any local process can send\nRESOURCE_CHANGE or CLIENT_MOVE notifications to the in-kernel witness\nhandler.\n\nThe same family exposes CIFS_GENL_MCGRP_SWN without multicast-group\ncapability flags.  Register messages sent to that group include the witness\nregistration id and, for NTLM-authenticated mounts, the username, domain,\nand password attributes copied from the CIFS session.  An unprivileged\nlocal process should not be able to join that group and receive those\nmessages.\n\nRequire CAP_NET_ADMIN for incoming SWN_NOTIFY commands with\nGENL_ADMIN_PERM, and require CAP_NET_ADMIN over the network namespace for\njoining the SWN multicast group with GENL_MCAST_CAP_NET_ADMIN.  The\ncifs.witness service runs with the privileges needed for both operations."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:31.045Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9cf7eb8919344932f909b2fac76296f7656fda8d"},{"url":"https://git.kernel.org/stable/c/9919021a3b7974ae66a5f9915e3a48c10cfd409b"},{"url":"https://git.kernel.org/stable/c/969bc6370334a5b4720c5470783295d6484bbc95"},{"url":"https://git.kernel.org/stable/c/a3238b09c58f323e40743ce174cd0ab81b5c09ed"},{"url":"https://git.kernel.org/stable/c/a8d17d22db591099519a89f14dd24810daba74c3"},{"url":"https://git.kernel.org/stable/c/c2397b93fbb6f44a788fff30f99be2c20cc5e50f"},{"url":"https://git.kernel.org/stable/c/d1ebfce2c1d161186a82e77590bf7da2ea1bce91"}],"title":"smb: client: require net admin for CIFS SWN netlink","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64137","datePublished":"2026-07-19T15:40:31.045Z","dateReserved":"2026-07-19T07:54:57.037Z","dateUpdated":"2026-07-19T15:40:31.045Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:55","lastModifiedDate":"2026-07-19 16:17:55","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64137","Ordinal":"1","Title":"smb: client: require net admin for CIFS SWN netlink","CVE":"CVE-2026-64137","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64137","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: require net admin for CIFS SWN netlink\n\nCIFS_GENL_CMD_SWN_NOTIFY is the userspace witness-notify command.  The\nintended sender is the cifs.witness helper, but the generic-netlink\noperation currently has no capability flag, so any local process can send\nRESOURCE_CHANGE or CLIENT_MOVE notifications to the in-kernel witness\nhandler.\n\nThe same family exposes CIFS_GENL_MCGRP_SWN without multicast-group\ncapability flags.  Register messages sent to that group include the witness\nregistration id and, for NTLM-authenticated mounts, the username, domain,\nand password attributes copied from the CIFS session.  An unprivileged\nlocal process should not be able to join that group and receive those\nmessages.\n\nRequire CAP_NET_ADMIN for incoming SWN_NOTIFY commands with\nGENL_ADMIN_PERM, and require CAP_NET_ADMIN over the network namespace for\njoining the SWN multicast group with GENL_MCAST_CAP_NET_ADMIN.  The\ncifs.witness service runs with the privileges needed for both operations.","Type":"Description","Title":"smb: client: require net admin for CIFS SWN netlink"}]}}}