CVE-2026-73860

Name	CVE-2026-73860
Description	CRIU is a checkpoint and restore tool for Linux. Prior to 4.2.1, CRIU injects a syscall;int3 sequence at the start of the first executable virtual memory area and resumes the target process to execute parasite code. Malicious code in the target process can keep an rseq critical section armed over that injection point so the kernel's restartable-sequence abort redirects execution to an attacker-controlled callback when CRIU resumes the process. In container snapshot environments, the hijacked parasite runs with seccomp disabled and a relaxed AppArmor profile and supplies trusted data to the privileged CRIU process, which can enable higher-privilege code execution. This issue is fixed in version 4.2.1.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
criu (PTS)	bookworm	3.17.1-2+deb12u2	vulnerable
	trixie	4.1.1-1	vulnerable
	forky, sid	4.2.1-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
criu	source	(unstable)	4.2-5

Notes

[trixie] - criu <no-dsa> (Minor issue)
[bookworm] - criu <postponed> (Minor issue)
https://github.com/checkpoint-restore/criu/pull/3097
https://github.com/checkpoint-restore/criu/security/advisories/GHSA-fvqj-jvxf-x3wp
Fixed by: https://github.com/checkpoint-restore/criu/commit/c34355a7c31494a8be65b32b4410a7539f6c2442 (v4.2.1)
Fixed by: https://github.com/checkpoint-restore/criu/commit/f7dafedda5075fd6509bda67fbce1622e0c87a27 (v4.2.1)
Fixed by: https://github.com/checkpoint-restore/criu/commit/3f377985942ef39bc8eb79e17e4ce0e02e69a28b
check, duplicate of CVE-2026-18107 asked both CNAs for which to keep