CVE-2026-97930 Linux CVE debrief

Who should care

Linux kernel maintainers and users should verify if their systems are affected by this vulnerability and apply patches accordingly to prevent potential buffer overflows and system instability. This includes reviewing system logs for potential exploitation attempts and monitoring for unusual activity.

Why it matters

Linux kernel maintainers and users should verify if their systems are affected by this vulnerability and apply patches accordingly to prevent potential buffer overflows and system instability.

• Potential buffer overflow when copying data from in04_buf to in04_last
• Possible system crashes or instability due to out-of-bounds memory access

Technical summary

The Linux kernel's ALSA usbusx2y module has a vulnerability caused by a mismatch between the size of the in04_last array and the in04_buf allocation. The in04_last array is declared as char[24], but in04_buf is allocated as sizeof(struct us428_ctls) which is 21 bytes. This can cause a buffer overflow when copying data from in04_buf to in04_last. The vulnerability can be triggered when ctl_snapshot_last == -2 (initialization path). Linux kernel maintainers and users should verify if their systems are affected by this vulnerability and apply patches accordingly.

Defensive priority

Linux kernel maintainers and users should verify if their systems are affected by this vulnerability and apply patches accordingly.

Recommended defensive actions

• Verify if the Linux kernel version used is affected by this vulnerability
• Apply patches to update the Linux kernel to a version that fixes this vulnerability
• Monitor system logs for potential exploitation attempts
• 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 describes a vulnerability in the Linux kernel's ALSA usbusx2y module. The in04_last array in struct usx2ydev is declared as char[24], but in04_buf is allocated as sizeof(struct us428_ctls) which is 21 bytes. This can cause a buffer overflow when copying data from in04_buf to in04_last. The vulnerability can be triggered when ctl_snapshot_last == -2 (initialization path).

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.