CVE-2026-4897

Name	CVE-2026-4897
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1132234

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
policykit-1 (PTS)	bullseye (security), bullseye	0.105-31+deb11u1	vulnerable
	bookworm	122-3	vulnerable
	trixie	126-2	vulnerable
	forky, sid	127-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
policykit-1	source	(unstable)	(unfixed)			1132234

Notes

https://bugzilla.redhat.com/show_bug.cgi?id=2451739
Fixed by: https://github.com/polkit-org/polkit/commit/7e122c8a5120c2aae2d9d44a26796dc18f5b677c
Introduced with (part of the fixes for CVE-2015-4625):
https://github.com/polkit-org/polkit/commit/ea544ffc18405237ccd95d28d7f45afef49aca17 (0.113)