Skip to content
Fencer Vulns
low 3.5

CVE-2026-85498 json

Polkit: regression in cve-2026-4897 fix (polkit read_cookie()) - stack buffer underflow

published 2026-10-29 11 d ago modified 2026-11-06 2 d ago also EUVD-2026-112679

cvss
3.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

A flaw was found in polkit. When processing input that begins with a null byte, an arithmetic error in the authentication agent helper causes an integer underflow during buffer length calculation, resulting in an out-of-bounds memory read. An attacker capable of supplying crafted input can trigger this flaw, potentially causing an application crash and resulting in a Denial of Service (DoS).

Patch / fix

  • Red Hat Red Hat Hardened Images 127-5.1.hum1
  • policykit-1 Debian 14 128-1

debian advisories DEBIAN-CVE-2026-85498

  • policykit-1 Ubuntu 22.04 LTS 0.105-33ubuntu0.2
  • policykit-1 Ubuntu 24.04 LTS 124-2ubuntu1.24.04.4
  • policykit-1 Ubuntu 26.04 LTS 127-2ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-85498

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • polkit hummingbird 1 127-5.1.hum1
  • polkit-libs hummingbird 1 127-5.1.hum1

red hat advisories RHSA-2026:66287

  • polkit openSUSE Tumbleweed 128-1.1

opensuse advisories openSUSE-SU-2026:12203-1

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-2026-85498 updated cvss 3.5

polkit: Regression in CVE-2026-4897 fix (polkit read_cookie()) - stack buffer underflow

  • Red Hat Enterprise Linux 6 polkit, polkit-gnome, polkit 125-6.el10, polkit-desktop-policy Red Hat Enterprise Linux 7 polkit, polkit-qt, polkit-kde, polkit 125-6.el10, polkit-pkla-compat Red Hat Enterprise Linux 8 polkit, polkit-libs, polkit 125-6.el10, polkit-pkla-compat Red Hat Enterprise Linux 9 polkit-libs, polkit 125-6.el10, polkit-pkla-compat Red Hat Enterprise Linux 10 polkit 125-6.el10, polkit-pkla-compat Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images polkit 127-5.1.hum1, polkit-libs 127-5.1.hum1
    fixed: vendor fix RHSA-2026:66287

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
none
Automatable
no
Technical impact
partial
Assessed
11 d ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.5 CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness

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.