Use-after-free in Linux kernel - CVE-2026-64001

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in snd_pcm_oss_proc_write() and snd_pcm_oss_look_for_setup() when handling proc writes followed by a later OSS device open. A local user can trigger a proc write error that leaves a stale setup_list entry and then open an OSS device to dereference freed memory to cause a denial of service.

The issue arises because a newly allocated setup entry may be linked into setup_list before task name allocation completes.

Affected software

How to mitigate CVE-2026-64001

External References

• https://git.kernel.org/stable/c/4cc54bdd54b337e77115be5b55577d1c58608eae
• https://git.kernel.org/stable/c/8be4efd0dc0093eb7a02ad1aac936bca2a1f04ce
• https://git.kernel.org/stable/c/be387230dc22d870afd0e5d35912b07c2bc323bd
• https://git.kernel.org/stable/c/e13922bb97b4e6f94f8ac02d034f2d4bd65eeb3c

Related Security Bulletins

• Use-after-free in Linux kernel core oss
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia