CVE-2026-74262 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of Linux kernel deployments should assess exposure and prioritize patching or verification to address potential operational impacts. This includes verifying Linux kernel versions and configurations for potential exposure, assessing and prioritizing patching or mitigation for affected Linux kernel deployments, and monitoring Linux kernel updates and applying patches as needed to ensure the

Why it matters

CVE-2026-74262 is a vulnerability in the Linux kernel's kcm subsystem that could lead to stale or misdirected wakeups. Linux kernel maintainers and users should assess exposure and prioritize patching or verification.

• Verify Linux kernel versions and configurations for potential exposure
• Assess and prioritize patching or mitigation for affected Linux kernel deployments

Technical summary

The Linux kernel's kcm subsystem has a vulnerability that could lead to stale or misdirected wakeups due to improper synchronization of callback-pointer updates. The fix involves using WRITE_ONCE() for callback replacement and restore operations to ensure visibility contract consistency, addressing the issue without introducing new technical debt or unsupported root causes. Linux kernel maintainers and users should assess exposure and prioritize patching or verification to mitigate potential operational impacts, including verifying Linux kernel versions and configurations for potential exposure

Defensive priority

Linux kernel maintainers and users should assess exposure and prioritize patching or verification.

Recommended defensive actions

• Assess exposure of Linux kernel deployments to CVE-2026-74262
• Verify if running Linux kernel versions are affected and prioritize patching
• Monitor Linux kernel updates and apply patches as needed
• 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 NVD entry provide details on the vulnerability in the Linux kernel's kcm subsystem, which could lead to stale or misdirected wakeups. The fix involves using WRITE_ONCE() for callback replacement and restore operations to ensure visibility contract consistency. However, its scope and impact require further verification by defenders, including checking Linux kernel versions and configurations for potential exposure, assessing and prioritizing patching or mitigation for affected Linux kernel deployments, and monitoring

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.