CVE-2026-46191 fbcon: Avoid OOB font access if console rotation fails
An out-of-bounds write in the Linux kernel's fbcon module allows attackers to cause memory corruption or denial of service via console rotation.
- 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-2026-46191?
CVE-2026-46191 is a high-severity memory corruption vulnerability in Linux kernel, published on 28 May 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:
fbcon: Avoid OOB font access if console rotation fails
Clear the font buffer if the reallocation during console rotation fails in fbcon_rotate_font(). The putcs implementations for the rotated buffer will return early in this case. See [1] for an example.
Currently, fbcon_rotate_font() keeps the old buffer, which is too small for the rotated font. Printing to the rotated console with a high-enough character code will overflow the font buffer.
v2: - fix typos in commit message
Weakness: CWE-125
Which versions are affected by CVE-2026-46191?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46191?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-46191 being exploited?
There is no known exploitation of CVE-2026-46191 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-89040, BELL-CVE-2026-46191, DEBIAN-CVE-2026-46191, GHSA-8j9w-r5cf-prpv, ROOT-OS-DEBIAN-11-CVE-2026-46191, ROOT-OS-DEBIAN-12-CVE-2026-46191 and 3 more.