Use-after-free in Linux kernel - CVE-2026-99271

Vulnerability details

The vulnerability allows a local user to potentially cause a denial of service by triggering a read from freed kernel memory.

The vulnerability exists due to a use-after-free in the Linux kernel ALSA Line6 USB audio driver when playback accesses a capture buffer after all capture streams have been closed. A local user can trigger playback, such as through the impulse test signal volume control, after the capture buffer is released to cause submit_audio_out_urb() to dereference the stale prev_fbuf pointer, potentially causing a denial of service.

Affected software

How to mitigate CVE-2026-99271

External References

• https://git.kernel.org/stable/c/22c82f33ff0b68d37041adf1dea5533a5863cd31
• https://git.kernel.org/stable/c/862d9268f40a6e10cef24eb226e738fb69ce8aa7
• https://git.kernel.org/stable/c/aa118c8f61d59387961d58ffae831c5259a9f222

Related Security Bulletins

• Use-after-free in Linux kernel usb line6