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Fencer Vulns
medium 6.0

CVE-2026-91203 json

Cockpit-files: cockpit-files: arbitrary file ownership and permission modification via symlink race condition

published 2026-09-18 51 d ago modified 2026-11-06 3 d ago also EUVD-2026-83296

cvss
6.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

A flaw was found in cockpit-files. This vulnerability allows a local attacker to exploit a timing issue, known as a symlink race condition, during privileged file operations such as changing file ownership or permissions. By manipulating directory entries and winning this race, the attacker can redirect these operations to unintended files. This could lead to unauthorized changes in file ownership and permissions on arbitrary files, potentially compromising system integrity and availability by altering system or application states or rendering services unusable.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:36.1-1.el10_2
  • cockpit-files Debian 14 45-1

debian advisories DEBIAN-CVE-2026-91203

  • cockpit-files AlmaLinux 10 36.1-1.el10_2

almalinux advisories ALSA-2026:95570

  • cockpit-files Rocky Linux 10 36.1-1.el10_2

rocky linux advisories RLSA-2026:95570

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-91203 updated cvss 6.0

cockpit-files: cockpit-files: Arbitrary file ownership and permission modification via symlink race condition

  • Red Hat Enterprise Linux 9 cockpit-files
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 10) cockpit-files 36.1-1.el10_2
    fixed: vendor fix RHSA-2026:95570

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
48 d ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2465632 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-363 Race Condition Enabling Link Following

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.