VulnerabilityPublished 25 Sep 2026Updated 21 Oct 2026

CVE-2026-97561: Linux kernel · smb: client: honor forceuid/forcegid when mapping SIDs to uid/gid

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e1b74f8f8c1d13190b09fe623b729d36b7ac22a8 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e1b74f8f8c1d13190b09fe623b729d36b7ac22a8, be6eccccec867c22d7c65fab4ea4e91ec3d5b8c6, bc35de451c128d399ad185d6269f8847e97cd1c9 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < e1b74f8f8c1d13190b09fe623b729d36b7ac22a8	Fixed in e1b74f8f8c1d13190b09fe623b729d36b7ac22a8
LinuxLinux	Affected ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < be6eccccec867c22d7c65fab4ea4e91ec3d5b8c6	Fixed in be6eccccec867c22d7c65fab4ea4e91ec3d5b8c6
LinuxLinux	Affected ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < bc35de451c128d399ad185d6269f8847e97cd1c9	Fixed in bc35de451c128d399ad185d6269f8847e97cd1c9
LinuxLinux	Affected ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < 18a72975e9f35aadecc75b031f693f2d1f49308f	Fixed in 18a72975e9f35aadecc75b031f693f2d1f49308f
LinuxLinux	Affected ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < 6ac7a29691558bed18e2df1780636b8aa0fd13d5	Fixed in 6ac7a29691558bed18e2df1780636b8aa0fd13d5
LinuxLinux	Affected =3.0	Fixed in–

Description

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.

References

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