CVE-2026-98938 Linux CVE debrief

Who should care

Linux kernel maintainers, developers, and users of affected versions should assess exposure and apply patches. The vulnerability affects Linux kernel versions 6.18 and 7.2.10 or earlier. Affected operator, platform, vulnerability-management, and security-team impact should be carefully evaluated to prioritize patching for critical systems.

Why it matters

A vulnerability in the Linux kernel's Rust implementation has been addressed. The issue involves passing RegistrationInner as a cookie to request_irq. This change was made to fix a problem where accessing registration.inner.device() in the IRQ callback could read uninitialized memory due to a race condition. Linux kernel maintainers, developers, and users of affected versions should assess exposure and apply patches.

• Verify patch application for Linux kernel versions 6.18 and 7.2.10 or earlier
• Assess exposure for specific Linux kernel deployments
• Prioritize patching for critical systems

Technical summary

The Linux kernel's Rust implementation had a vulnerability where accessing registration.inner.device() in the IRQ callback could read uninitialized memory. This was fixed by passing RegistrationInner as a cookie to request_irq, ensuring that the RegistrationInner fields are initialized before the IRQ is enabled. The fix prevents the read of uninitialized memory and addresses the race condition in the Devres implementation. Linux kernel maintainers, developers, and users of affected versions should assess exposure and apply patches.

Defensive priority

Assess exposure and apply patches for Linux kernel versions 6.18 and 7.2.10 or earlier.

Recommended defensive actions

• Assess exposure for Linux kernel versions 6.18 and 7.2.10 or earlier
• Apply patches for affected Linux kernel versions
• Verify vulnerability status for specific deployments
• 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 source item provide details on the vulnerability and its fix. The NVD entry is currently empty. The vulnerability was introduced due to a race condition in the Devres implementation, which was fixed by passing RegistrationInner as a cookie to request_irq. The fix was applied to address the issue in the Linux kernel's Rust implementation.

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.