Use-after-free in Linux kernel - CVE-2026-93163

Vulnerability details

The vulnerability allows a local user to trigger a use-after-free.

The vulnerability exists due to a use-after-free in the hwrng_register function when handling a hardware random number generator registration failure. A local user can cause registration to fail after the random number generator has been added to the global rng_list and free the associated structure to trigger a use-after-free.

Affected software

How to mitigate CVE-2026-93163

External References

• https://git.kernel.org/stable/c/3a5834db2b1ce25649f330e78efe1ccde78967fd
• https://git.kernel.org/stable/c/bee8d1fcdc8f389b595b0a4cf6fe8440f499458a
• https://git.kernel.org/stable/c/cf293c9c7424de0d04b51367d07f40570ce80231
• https://git.kernel.org/stable/c/de4f1bcb61a73cc896decdbd27d61a34add93b53

Related Security Bulletins

• Use-after-free in Linux kernel char hw_random driver