CVE-2026-97561smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid When the administrator mounts with forceuid or forcegid (uid=/gid= mount options), they expect all files to appear owned by the specified user/group. However, several code paths unconditionally called sid_to_id() to overwrite cf_uid/cf_gid with server-provided values, ignoring the administrator's explicit override: - smb311_posix_info_to_fattr() (stat via POSIX extensions) - cifs_posix_to_fattr() (readdir via POSIX extensions) - parse_sec_desc() (CIFS ACL ownership mapping) This allowed an untrusted server to dictate local file ownership even when the mount was configured to force specific uid/gid values. Fix all three call sites to check CIFS_MOUNT_OVERR_UID and CIFS_MOUNT_OVERR_GID before calling sid_to_id(), following the same pattern already used by cifs_unix_basic_to_fattr() for unix extensions.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 9409ae58e0759d010b347e7b19ebc90ab5d4b98f builds before 6ac7a29691558bed18e2df1780636b8aa0fd13d5; from 9409ae58e0759d010b347e7b19ebc90ab5d4b98f before e1b74f8f8c1d13190b09fe623b729d36b7ac22a8; 9409ae58e0759d010b347e7b19ebc90ab5d4b98f builds before 18a72975e9f35aadecc75b031f693f2d1f49308f | CNA record |
References
- https://git.kernel.org/stable/c/6ac7a29691558bed18e2df1780636b8aa0fd13d5
- https://git.kernel.org/stable/c/e1b74f8f8c1d13190b09fe623b729d36b7ac22a8
- https://git.kernel.org/stable/c/18a72975e9f35aadecc75b031f693f2d1f49308f
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.