CVE-2026-64560 Linux CVE debrief

Who should care

Linux kernel developers, Linux distribution maintainers, and users of Linux-based systems should be aware of this vulnerability and take steps to mitigate it. Linux kernel developers and maintainers should review the supplied patches and apply them to their systems. Users of Linux-based systems should ensure that their systems are updated with the latest kernel patches. Security teams should review the vulnerability and assess the potential impact on their systems. Vulnerability management teams should prioritize the patching of affected systems. Operators of Linux-based systems should be aware of the potential risks and take steps to mitigate them. Platform administrators should ensure that their systems are updated with the latest kernel patches. Security teams should review the vulnerability and assess the potential impact on their systems. Compliance teams should ensure that their systems are compliant with the latest kernel patches. Asset owners should be aware of the potential risks and take steps to mitigate them. Incident response teams should be prepared to respond to potential attacks. Penetration testers and red teamers should be aware of the vulnerability and test for it in their assessments. Blue teamers and defenders should be aware of the vulnerability and take steps to detect and prevent potential attacks. Auditors and compliance teams should review the vulnerability and assess the potential impact on their systems. Threat hunters should be aware of the vulnerability and take steps to detect potential attacks. Security architects should review the vulnerability and assess the potential impact on their systems. Security engineers should review the vulnerability and take steps to mitigate it. Security researchers should be aware of the vulnerability and take steps to study and mitigate it. System administrators should ensure that their systems are updated with the latest kernel patches. Network administrators should be aware of the potential risks and take steps to mitigate them. Cloud administrators should ensure that their systems are updated with the latest kernel patches. DevOps teams should review the vulnerability and take steps to mitigate它.

Technical summary

The vulnerability arises from a race condition in the posix_cpu_timer_del() and sys_timer_delete() functions in the Linux kernel. This can result in a use-after-free (UAF) vulnerability, allowing an attacker to potentially execute arbitrary code. The issue is related to the handling of posix CPU timers during the execution of a non-leader process. The vulnerability was reported by Wongi and Jungwoo, who decoded a non-leader exec() related race which can result in an UAF. The issue arises from a race condition in the posix_cpu_timer_del() and sys_timer_delete() functions. The vulnerability can be triggered by a non-leader exec() race, which can result in a use-after-free (UAF) vulnerability.

Defensive priority

High

Recommended defensive actions

• Apply the kernel patches provided to address the vulnerability
• Restrict access to sensitive systems and data
• Monitor system logs for suspicious activity
• Implement compensating controls to mitigate potential attacks
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability was reported by Wongi and Jungwoo, who decoded a non-leader exec() related race which can result in an UAF. The issue arises from a race condition in the posix_cpu_timer_del() and sys_timer_delete() functions.

Official resources