CVE-2026-98757 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems that use the USB cdns3 driver should review and apply the patch, ensure that the Linux kernel is updated to a version that includes the fix, and monitor Linux kernel and USB cdns3 driver security advisories.

Why it matters

This vulnerability requires verification of patch application and kernel version updates. Linux kernel developers and maintainers should review and apply the patch. Linux distribution maintainers and users of Linux-based systems that use the USB cdns3 driver should ensure that the Linux kernel is updated to a version that includes the fix.

• Verify patch application and kernel version updates.
• Monitor Linux kernel and USB cdns3 driver security advisories.

Technical summary

The Linux kernel's USB cdns3 driver has a use-after-free vulnerability. The cdns3_gadget_exit() function does not wait for the pending_status_wq and aligned_buf_wq works to complete before freeing the gadget device and its associated resources. This can cause a use-after-free error when a work queued before the exit runs after the free. Linux kernel developers and maintainers should review and apply the patch. Linux distribution maintainers and users of Linux-based systems that use the USB cdns3 driver should ensure that the Linux kernel is updated to a version that includes the fix.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch provided by the Linux kernel maintainers.
• Ensure that the Linux kernel is updated to a version that includes the fix.
• Monitor the Linux kernel and USB cdns3 driver for any related security advisories or updates.
• Verify patch application and kernel version updates.
• 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 found by an in-house static analysis tool. The CVE record and NVD entry provide details on the vulnerability, but there is limited information on exploitation or impact. Linux kernel developers and maintainers should verify patch application and kernel version updates. Linux distribution maintainers and users of Linux-based systems that use the USB cdns3 driver should ensure that the Linux kernel is updated to a version that includes the fix and monitor Linux kernel and USB cdns3 driver security advisories.

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.