# CVE-2026-73860: CRIU: Parasite hijack triggered by snapshot of malicious software

Status: published. Published: 2026-11-06. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- checkpoint-restore / criu: < 4.2.1 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 5.4 (medium); CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-705

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/checkpoint-restore/criu/security/advisories/GHSA-fvqj-jvxf-x3wp (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/checkpoint-restore/criu/pull/3098 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/checkpoint-restore/criu/commit/c34355a7c31494a8be65b32b4410a7539f6c2442 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/checkpoint-restore/criu/commit/f7dafedda5075fd6509bda67fbce1622e0c87a27 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/checkpoint-restore/criu/releases/tag/v4.2.1 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-73860; retrieved 2026-11-06; source updated 2026-11-06

Revision: 8441873f61f96d69b134262b501d9a05802dea7a2b90524f1ce1b5a62eadeb7f

Canonical: https://y2.dev/cve/CVE-2026-73860

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