CVE-2026-93061 gpu: host1x: Avoid stack over-read in debug output helpers

Not scored Published 17 Sep 2026 Updated 19 Oct 2026

A local attacker with debugfs access can trigger a stack over-read in Linux kernel host1x debug helpers, potentially leaking sensitive memory contents.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-93061?

CVE-2026-93061 is a vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

gpu: host1x: Avoid stack over-read in debug output helpers

host1x_debug_output() and host1x_debug_cont() used vsnprintf(), which returns the length the formatted string would have reached with an unbounded buffer. That return value was passed straight to o->fn as the number of bytes to emit.

This could cause a read past end of the output buffer if a call to host1x_debug_* produced a string longer than 256 bytes. This only affected the debugfs files as the printk debug sink ignores the number of bytes. In practice, this is very unlikely to occur.

Fix by switching to vscnprintf(), which returns the number of bytes actually written.

Which versions are affected by CVE-2026-93061?

How do I fix CVE-2026-93061?

Apply the vendor's patch.

Is CVE-2026-93061 being exploited?

There is no known exploitation of CVE-2026-93061 in the wild and no public exploit code.

Sources

Also known as AZL-102320, BELL-CVE-2026-93061, DEBIAN-CVE-2026-93061, GHSA-rpw2-4xvh-v843, UBUNTU-CVE-2026-93061.