Out-of-bounds write in Linux kernel - CVE-2026-90069

Vulnerability details

The vulnerability allows a local user to perform an out-of-bounds write.

The vulnerability exists due to insufficient allocation of cloned asynchronous compression request contexts in acomp_request_clone() when cloning a stack-based asynchronous compression request. A local user can trigger use of an asynchronous implementation that writes through acomp_request_ctx() beyond the cloned request allocation to perform an out-of-bounds write.

Only configurations that select an asynchronous compression implementation are affected.

Affected software

How to mitigate CVE-2026-90069

External References

• https://git.kernel.org/stable/c/889fa17a0af09ff93a9166abc82ee7a654faa49b
• https://git.kernel.org/stable/c/d48197cbd5d3476c7deea644972e9ec510865ec2
• https://git.kernel.org/stable/c/ee440d4fc0d2f15894ab1f64c474a3adbc858880

Related Security Bulletins

• Out-of-bounds write in Linux kernel crypto