CVE-2026-64375 Linux CVE debrief

Who should care

Linux system administrators, security teams, and developers responsible for Linux kernel maintenance or deployment should assess exposure and prioritize patching. This includes those managing Linux systems, maintaining kernel versions, or responsible for vulnerability management and security assessments.

Why it matters

The Linux kernel vulnerability CVE-2026-64375 allows for a race condition that could potentially be exploited for privilege escalation. Linux system administrators and security teams should assess exposure and prioritize patching.

• Privilege escalation is possible if the vulnerability is exploited
• Linux system administrators and security teams need to assess exposure and prioritize patching
• Patching is required to mitigate the vulnerability

Technical summary

The Linux kernel's proc subsystem is vulnerable to a race condition, potentially allowing for privilege escalation. The issue arises from the proc_pid_get_link() and proc_pid_readlink() functions, which perform a ptrace access check on a task looked up from a pid, then look up the task again to perform the actual access. This racy behavior can be mitigated by passing the task to the ->proc_get_link() handler and introducing a new helper call_proc_get_link() that locks the task, performs the access check, and calls ->proc_get_link(). Linux system administrators and security teams should assess exposure and prioritize patching, as this vulnerability has been resolved in various Linux kernel versions.

Defensive priority

Linux system administrators and security teams should assess exposure and prioritize patching, as this vulnerability has been resolved in various Linux kernel versions.

Recommended defensive actions

• Assess exposure and prioritize patching for Linux systems
• Review and apply available patches for the Linux kernel
• Monitor Linux system logs for potential exploitation attempts
• 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
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and associated NVD entry provide details on the vulnerability, including its CVSS score of 7.8 and HIGH severity. Multiple patches are referenced, indicating a comprehensive fix across various Linux kernel versions.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.