CVE-2026-98741 Linux CVE debrief

Who should care

Linux kernel maintainers, ALSA developers, and users of the ua101 driver should assess their exposure and apply patches if necessary. Operators of systems using the Linux kernel with the ALSA ua101 driver should verify their kernel version and update to a patched version if necessary. Vulnerability management and security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Why it matters

The Linux kernel's ALSA ua101 driver vulnerability can lead to a potential security issue if not addressed. Users should verify their kernel version and apply patches to prevent exploitation.

• Verify kernel version and apply patches to prevent potential out-of-bounds writes.
• Monitor system logs for exploitation attempts.
• Review and update Linux kernel configurations to ensure secure settings.

Technical summary

The Linux kernel's ALSA ua101 driver is vulnerable to an out-of-bounds write due to a mismatch in capture and playback packet sizes. The driver fails to properly relate the capture and playback interfaces' wMaxPacketSize and bNrChannels, leading to a potential security issue. This vulnerability can be triggered when a device declares a large capture wMaxPacketSize with few capture channels and a small playback wMaxPacketSize with many playback channels. Genuine UA-101/UA-1000 hardware is unaffected as it declares proportional packet sizes. The bug was identified using KASAN (Kernel Address Sanitizer).

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided kernel patches to ensure the vulnerability is addressed.
• Verify the Linux kernel version and update to a patched version if necessary.
• Monitor system logs for potential exploitation attempts.
• Perform a thorough review of the ALSA ua101 driver configuration to ensure secure settings.
• 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 vulnerability was discovered in the Linux kernel's ALSA ua101 driver. The issue is caused by a mismatch in capture and playback packet sizes, which can lead to an out-of-bounds write. The bug was identified using KASAN (Kernel Address Sanitizer).

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.