checkpoint-restore Criu up to 4.2.0 rseq redirect

Summaryinfo

A vulnerability marked as problematic has been reported in checkpoint-restore Criu up to 4.2.0. This affects an unknown function of the component rseq. This manipulation causes redirect. This vulnerability is handled as CVE-2026-73860. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in checkpoint-restore Criu up to 4.2.0 and classified as problematic. Affected by this vulnerability is an unknown code of the component rseq. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-73860 since 08/13/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/06/2026). MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

Upgrading to version 4.2.1 eliminates this vulnerability.

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Productinfo

Vendor

• checkpoint-restore

Name

• Criu

Version

• 4.0
• 4.1
• 4.2.0

Website

• Product: https://github.com/checkpoint-restore/criu/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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