Use-after-free in Linux kernel - CVE-2026-80661

Vulnerability details

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

The vulnerability exists due to a use-after-free in TP_printk() handling in drivers/ufs/core/ufs_trace.h when reading UFS trace events from the tracing subsystem after the saved pointer has become invalid. A local user can read the trace file and trigger dereferencing of a freed pointer to cause a denial of service.

The issue occurs because the trace event stored a pointer and TP_printk() dereferenced it later when the event was read, potentially long after the original object had been freed.

Affected software

How to mitigate CVE-2026-80661

External References

• https://git.kernel.org/stable/c/2510434307a224078302019e52ab3c863fbe87fb
• https://git.kernel.org/stable/c/535fcf4b8a261fbb8cc4f91e4597343c135a90f2
• https://git.kernel.org/stable/c/e497fef9ad7e913f52de6f97e818f56915e96164

Related Security Bulletins

• Use-after-free in Linux kernel ufs core driver