smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid

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Summary

CVECVE-2026-97561
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:06 UTC
Updated2026-09-28 06:16:38 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001890000 probability, percentile 0.076590000 (date 2026-09-29)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9409ae58e0759d010b347e7b19ebc90ab5d4b98f e1b74f8f8c1d13190b09fe623b729d36b7ac22a8 git Not specified
CNA Linux Linux affected 9409ae58e0759d010b347e7b19ebc90ab5d4b98f 18a72975e9f35aadecc75b031f693f2d1f49308f git Not specified
CNA Linux Linux affected 3.0 Not specified
CNA Linux Linux unaffected 3.0 semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e1b74f8f8c1d13190b09fe623b729d36b7ac22a8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/18a72975e9f35aadecc75b031f693f2d1f49308f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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