{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64137", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.037Z", "datePublished": "2026-07-19T15:40:31.045Z", "dateUpdated": "2026-07-19T15:40:31.045Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:40:31.045Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/netlink.c"], "versions": [{"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8", "lessThan": "9cf7eb8919344932f909b2fac76296f7656fda8d", "status": "affected", "versionType": "git"}, {"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8", "lessThan": "9919021a3b7974ae66a5f9915e3a48c10cfd409b", "status": "affected", "versionType": "git"}, {"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8", "lessThan": "969bc6370334a5b4720c5470783295d6484bbc95", "status": "affected", "versionType": "git"}, {"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8", "lessThan": "a3238b09c58f323e40743ce174cd0ab81b5c09ed", "status": "affected", "versionType": "git"}, {"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8", "lessThan": "a8d17d22db591099519a89f14dd24810daba74c3", "status": "affected", "versionType": "git"}, {"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8", "lessThan": "c2397b93fbb6f44a788fff30f99be2c20cc5e50f", "status": "affected", "versionType": "git"}, {"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8", "lessThan": "d1ebfce2c1d161186a82e77590bf7da2ea1bce91", "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/netlink.c"], "versions": [{"version": "5.11", "status": "affected"}, {"version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.210", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.92", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "5.11", "versionEndExcluding": "5.15.210"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.176"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.1"}]}]}], "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"}}}}

{}

{}

{"bugzilla": {"description": "kernel: smb: client: require net admin for CIFS SWN netlink", "id": "2502600", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502600"}, "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-280", "details": ["A flaw was found in the Linux kernel's Common Internet File System (CIFS) client. This vulnerability allows an unprivileged local user to send witness notifications or join a specific multicast group without proper administrative privileges. Exploiting this flaw could lead to information disclosure, as sensitive data such as usernames, domains, and passwords from NTLM-authenticated mounts might be exposed to the unauthorized process. This issue arises from missing capability checks in the generic netlink operations for CIFS witness notifications."], "name": "CVE-2026-64137", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64137\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64137\nhttps://lore.kernel.org/linux-cve-announce/2026071928-CVE-2026-64137-f080@gregkh/T"], "threat_severity": "Important"}

{}