243 lines
13 KiB
JSON
243 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64137",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.037Z",
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"datePublished": "2026-07-19T15:40:31.045Z",
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"dateUpdated": "2026-08-05T12:39:38.366Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:39:38.366Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Exploitation requires local access via generic-netlink syscalls (socket/bind/sendmsg/setsockopt on NETLINK_GENERIC), not remote SMB or network packet handling.\nAC:L - An unprivileged attacker can reliably join the SWN multicast group and send crafted SWN_NOTIFY commands; registration IDs are exposed in multicast register messages, with no races or uncontrollable conditions.\nPR:L - Before the fix, no capability checks guarded SWN_NOTIFY or multicast group membership, so any unprivileged local user could exploit without CAP_NET_ADMIN or user-namespace tricks.\nUI:N - Exploitation is passive (multicast subscription) or active (netlink injection) and does not require any victim action at attack time beyond pre-existing witness-enabled CIFS mounts.\nS:U - Impact is confined to the local kernel/CIFS client security domain (credential theft and connection manipulation); it does not cross VM, container, or IOMMU boundaries.\nC:H - Multicast register messages disclose NTLM username, domain, and plaintext password from active CIFS witness sessions to any local subscriber.\nI:H - Forged CLIENT_MOVE notifications redirect SMB reconnects to attacker-controlled endpoints, compromising connection integrity and enabling MITM against mounted cluster shares.\nA:H - Forged RESOURCE_CHANGE notifications force CIFS reconnect cycles on all channels, enabling reliable denial-of-service against witness-enabled mounts."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/client/netlink.c"
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],
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"versions": [
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "9cf7eb8919344932f909b2fac76296f7656fda8d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "9919021a3b7974ae66a5f9915e3a48c10cfd409b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "969bc6370334a5b4720c5470783295d6484bbc95",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "a3238b09c58f323e40743ce174cd0ab81b5c09ed",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "a8d17d22db591099519a89f14dd24810daba74c3",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "c2397b93fbb6f44a788fff30f99be2c20cc5e50f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fed979a7e082bd9f25f9002c3c4f8740dacd0bc8",
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"lessThan": "d1ebfce2c1d161186a82e77590bf7da2ea1bce91",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/smb/client/netlink.c"
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],
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"versions": [
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{
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"version": "5.11",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.11",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.210",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.176",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.143",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.92",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.11",
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"versionEndExcluding": "5.15.210"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.11",
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"versionEndExcluding": "6.1.176"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.11",
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"versionEndExcluding": "6.6.143"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.11",
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"versionEndExcluding": "6.12.92"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.11",
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"versionEndExcluding": "6.18.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.11",
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"versionEndExcluding": "7.0.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.11",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/9cf7eb8919344932f909b2fac76296f7656fda8d"
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},
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{
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"url": "https://git.kernel.org/stable/c/9919021a3b7974ae66a5f9915e3a48c10cfd409b"
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},
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{
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"url": "https://git.kernel.org/stable/c/969bc6370334a5b4720c5470783295d6484bbc95"
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},
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{
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"url": "https://git.kernel.org/stable/c/a3238b09c58f323e40743ce174cd0ab81b5c09ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/a8d17d22db591099519a89f14dd24810daba74c3"
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},
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{
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"url": "https://git.kernel.org/stable/c/c2397b93fbb6f44a788fff30f99be2c20cc5e50f"
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},
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{
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"url": "https://git.kernel.org/stable/c/d1ebfce2c1d161186a82e77590bf7da2ea1bce91"
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}
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],
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"title": "smb: client: require net admin for CIFS SWN netlink",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |