CVE-2026-80778 Linux CVE debrief

Who should care

Linux system administrators and users should assess exposure and apply kernel updates to address potential use-after-free issues in the Linux kernel's futex subsystem. Linux kernel developers and maintainers should review the fix and ensure it is properly integrated into the kernel codebase. Security teams and vulnerability researchers should review the CVE record and NVD entry for additional information on the vulnerability and its impact. IT teams and Cy

Why it matters

A vulnerability in the Linux kernel's futex subsystem has been addressed. The issue involves private futex owners and potential use-after-free problems. The fix validates that private futex owners and waiters share the same memory management context.

• Verify Linux kernel versions to ensure the fix is applied.
• Monitor system logs for suspicious futex subsystem activity.

Technical summary

The Linux kernel's futex subsystem has been updated to reject cross-memory management private futex owners. This change prevents potential use-after-free issues when a private futex key's waiter's memory management context is freed while still in use by the owner's PI state. The fix involves validating that private futex owners and waiters share the same memory management context. This update addresses a use-after-free vulnerability in the futex subsystem that could be exploited by an attacker to potentially execute arbitrary code or cause a denial-of-service.

Defensive priority

Apply kernel updates to address potential use-after-free issues in the Linux kernel's futex subsystem.

Recommended defensive actions

• Apply kernel updates to address potential use-after-free issues in the Linux kernel's futex subsystem.
• Review system logs for suspicious futex subsystem activity.
• Ensure systems are running with the latest Linux kernel updates.
• Verify Linux kernel versions to ensure the fix is applied.
• Monitor system logs for suspicious futex subsystem activity.
• Perform regular vulnerability assessments to identify potential exposure.
• Track and review relevant security advisories for the Linux kernel.

Evidence notes

The CVE record and NVD entry provide details on the Linux kernel vulnerability and its fix. Multiple source references from kernel.org are available. The fix was applied to the Linux kernel to address the use-after-free issue. The vulnerability was identified and addressed through the collaborative efforts of the Linux kernel development community and vulnerability researchers. The CVE record and NVD entry provide additional information on the vulnerability and its impact.

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.