5.3

CVE-2026-97561: linux

CVSS: 5.3v4.0MediumReceived
AliasesUBUNTU-CVE-2026-97561DEBIAN-CVE-2026-97561
Published 25-09-2026Last modified 21-10-2026
Open JSON

Vulnerability summary

CVE-2026-97561 is a medium (CVSS 5.3) vulnerability in linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v4.0 (OSV · Ubuntu), selected by version preference
EPSS score
0.20%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12074-1

Timeline

  1. 25-09-2026
    PublishedVulnerability first disclosed.
  2. 21-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202621-10-2026
EPSS score
0.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 7.2.7-1
Linux1 product
  • linux≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < be6eccccec867c22d7c65fab4ea4e91ec3d5b8c6 | ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < bc35de451c128d399ad185d6269f8847e97cd1c9 | ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < 6ac7a29691558bed18e2df1780636b8aa0fd13d5 | ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < e1b74f8f8c1d13190b09fe623b729d36b7ac22a8 | ≥ 9409ae58e0759d010b347e7b19ebc90ab5d4b98f, < 18a72975e9f35aadecc75b031f693f2d1f49308f | 3.0

3 vendors · 171 products

References

8 links