CVE-2026-72183 Linux CVE debrief

Who should care

Linux kernel security teams, Linux distribution maintainers, and users of Linux-based systems should review and apply patches for LANDLOCK_SCOPE_SIGNAL bypass vulnerabilities. They should also monitor Linux kernel security advisories for updates and verify Landlock domain recording for non-single-process targets. Additionally, they should ensure that the patch is applied to prevent the bypass of LANDLOCK_SCOPE_SIGNAL protections through asynchronous SIGIO delivery. This includes reviewing compensating controls for exposed systems while remediation is scheduled and verified, and checking relevant monitoring, detection, and logs for exposed assets that need extra review. Linux kernel security teams should prioritize patching and verifying the effectiveness of the patch in their environments. Users of Linux-based systems should also be aware of the potential impact of this vulnerability on their systems and take steps to mitigate it. This may involve working with Linux distribution maintainers to ensure that patches are applied and verifying the effectiveness of the patch in their environments. Overall, a coordinated effort is required to address this vulnerability and prevent potential attacks. The vulnerability highlights the importance of maintaining up-to-date Linux kernel security and monitoring for potential threats. By taking proactive steps, Linux kernel security teams, Linux distribution maintainers, and users of Linux-based systems can reduce the risk of exploitation and protect their systems from potential attacks. It is essential to stay informed about the latest Linux kernel security advisories and updates to ensure the security and integrity of Linux-based systems. This includes reviewing and applying patches, monitoring for potential threats, and verifying the effectiveness of security measures. By working together, we can prevent potential attacks and maintain the security and integrity of Linux-based systems. The Linux kernel security community plays a critical role in addressing this vulnerability and ensuring the security of Linux-based systems. By prioritizing patching, verifying the effectiveness of the patch, and staying informed about the .

Technical summary

The Linux kernel vulnerability CVE-2026-72183 allows a sandboxed process to bypass LANDLOCK_SCOPE_SIGNAL protections through asynchronous SIGIO delivery. A patch has been applied to record the Landlock domain for every non-single-process target and exempt the registrant's thread group. The patch ensures that the scope is enforced against each group member at delivery time, restoring the same-process guarantee while keeping out-of-domain group members blocked. Linux kernel security teams should review and apply patches for LANDLOCK_SCOPE_SIGNAL bypass vulnerabilities.

Defensive priority

Linux kernel security teams should review and apply patches for LANDLOCK_SCOPE_SIGNAL bypass vulnerabilities.

Recommended defensive actions

• Review and apply Linux kernel patches for LANDLOCK_SCOPE_SIGNAL bypass vulnerabilities
• Monitor Linux kernel security advisories for updates
• Verify Landlock domain recording for non-single-process targets
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The Linux kernel vulnerability allows a sandboxed process to bypass LANDLOCK_SCOPE_SIGNAL protections through asynchronous SIGIO delivery. A patch has been applied to record the Landlock domain for every non-single-process target and exempt the registrant's thread group.

Official resources