Medium 5.5Published Mar 26, 2026

CVE-2026-4897Polkit: polkit: denial of service via unbounded input processing through standard input

Updated under an hour ago (Oct 26, 2026, 8:20 PM ET)

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It affects Red Hat Enterprise Linux 10 and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Red Hat Enterprise Linux 10

Exploited in the last 30 days

A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the `polkit-agent-helper-1` setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.

CVSS: 5.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Modified
Record last updated: Sep 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:125-4.el10_2.1 not affected	CNA record
Red Hat Red Hat Hardened Images redhat:hummingbird	from 127-5.1.hum1 not affected	CNA record
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CNA record
freedesktop polkit freedesktop:polkit	all versions	NVD
redhat openshift_container_platform redhat:openshift_container_platform	4.0	NVD
redhat enterprise_linux redhat:enterprise_linux	6.0; 7.0; 8.0; 9.0; 10.0	NVD

References

References

https://access.redhat.com/errata/RHSA-2026:59997	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:66287	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2026-4897	vdb-entry, x-refsource-redhat, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2451739	issue-tracking, x-refsource-redhat, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.