Answer in brief
CVE-2026-64137 records a High severity (CVSS 7.8) vulnerability in smb: client: require net admin for CIFS SWN netlink. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 <9cf7eb8919344932f909b2fac76296f7656fda8d || >=fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 <9919021a3b7974ae66a5f9915e3a48c10cfd409b || >=fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 <969bc6370334a5b4720c5470783295d6484bbc95 || >=fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 <a3238b09c58f323e40743ce174cd0ab81b5c09ed || >=fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 <a8d17d22db591099519a89f14dd24810daba74c3 || >=fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 <c2397b93fbb6f44a788fff30f99be2c20cc5e50f || >=fed979a7e082bd9f25f9002c3c4f8740dacd0bc8 <d1ebfce2c1d161186a82e77590bf7da2ea1bce91 | 9cf7eb8919344932f909b2fac76296f7656fda8d, 9919021a3b7974ae66a5f9915e3a48c10cfd409b, 969bc6370334a5b4720c5470783295d6484bbc95, a3238b09c58f323e40743ce174cd0ab81b5c09ed, a8d17d22db591099519a89f14dd24810daba74c3, c2397b93fbb6f44a788fff30f99be2c20cc5e50f, d1ebfce2c1d161186a82e77590bf7da2ea1bce91 |
| Linux/Linuxgeneric | 5.11 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: smb: client: require net admin for CIFS SWN netlink CIFS_GENL_CMD_SWN_NOTIFY is the userspace witness-notify command. The intended sender is the cifs.witness helper, but the generic-netlink operation currently has no capability flag, so any local process can send RESOURCE_CHANGE or CLIENT_MOVE notifications to the in-kernel witness handler. The same family exposes CIFS_GENL_MCGRP_SWN without multicast-group capability flags. Register messages sent to that group include the witness registration id and, for NTLM-authenticated mounts, the username, domain, and password attributes copied from the CIFS session. An unprivileged local process should not be able to join that group and receive those messages. Require CAP_NET_ADMIN for incoming SWN_NOTIFY commands with GENL_ADMIN_PERM, and require CAP_NET_ADMIN over the network namespace for joining the SWN multicast group with GENL_MCAST_CAP_NET_ADMIN. The cifs.witness service runs with the privileges needed for both operations.
Quoted source text, attributed separately from HOL analysis.