CVE-2026-99048 Linux CVE debrief

Who should care

Linux kernel developers and administrators responsible for maintaining and securing Linux-based systems should assess exposure and apply the patch if necessary to prevent potential denial of service due to deadlock when disabling XSK pools. They should also verify the Linux kernel version and apply the fix if necessary, and monitor for any potential exploitation attempts.

Why it matters

A deadlock vulnerability in the Linux kernel's gve driver requires attention from Linux kernel developers and administrators to assess exposure and apply the patch.

• Potential denial of service due to deadlock when disabling XSK pools.
• Need to verify Linux kernel version and apply fix if necessary.
• Possible impact on network performance and stability.

Technical summary

The Linux kernel's gve driver has a deadlock vulnerability when attempting to disable XSK pools. This is due to the use of unlocked versions of napi_disable and napi_enable, which can lead to a deadlock when the netdev lock has already been acquired. The issue has been addressed by updating the NAPI calls to use the locked versions. The vulnerability affects Linux versions prior to the fix and requires attention from Linux kernel developers and administrators to assess exposure and apply the patch if necessary to prevent potential denial of service.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch to update the NAPI calls to use the locked versions.
• Verify the Linux kernel version and apply the fix if necessary.
• Monitor for any potential exploitation attempts.
• 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 CVE record and source item provide details on the vulnerability, including its description and affected versions. However, the CVSS score and severity are not provided. The issue was found in production, and the fix involves updating the NAPI calls to use the locked versions. The Linux kernel's gve driver has a deadlock vulnerability when attempting to disable XSK pools due to the use of unlocked versions of napi_disable and napi_enable.

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.