CVE-2026-31645 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators should be aware of this vulnerability and take necessary actions to update their systems. The affected operator is the Linux kernel maintainer. The platform impact is high. The vulnerability-management impact is high. The security-team impact is high.

Why it matters

The Linux kernel's lan966x driver has a page pool leak vulnerability that can lead to memory leaks and potential denial-of-service (DoS) attacks. Linux kernel maintainers and users should review and apply the patches provided to update their systems.

• Memory leaks can occur, potentially leading to denial-of-service (DoS) attacks.
• The vulnerability can be used to exhaust system resources, impacting system performance.

Technical summary

The Linux kernel's lan966x driver has a page pool leak vulnerability. The `lan966x_fdma_rx_alloc()` function creates a page pool but fails to destroy it in case of errors, leading to a memory leak. The issue has been resolved with additional `page_pool_destroy()` calls in the error paths. The affected product context is the Linux kernel's lan966x driver. The defensive impact is a denial-of-service (DoS) attack. The source-grounded technical framing is based on the CVE record and NVD entry. The vulnerability-management impact is high.

Defensive priority

Medium priority for Linux kernel maintainers and users, as the vulnerability can lead to memory leaks and potential denial-of-service (DoS) attacks.

Recommended defensive actions

• Review and apply the patches provided by the Linux kernel maintainers.
• Update the Linux kernel to a version that includes the fix.
• Monitor the system for potential memory leaks and performance issues.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• 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.

Evidence notes

The vulnerability was introduced in the Linux kernel and affects various versions. The CVE record and NVD entry provide details on the affected versions and the patch. The evidence limits are based on the available information from the CVE record and NVD entry. Defenders should verify the affected versions and apply the patch to mitigate the vulnerability.

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.