CVE-2026-90245 fbdev: kyro: Validate overlay viewport coordinates
A local attacker can trigger integer overflows in the Kyro framebuffer driver, potentially causing system instability or denial of service.
- 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-2026-90245?
CVE-2026-90245 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:
fbdev: kyro: Validate overlay viewport coordinates
The overlay viewport end coordinates are computed from the viewport origin and dimensions using 32-bit unsigned arithmetic. Large input values can cause these calculations to wrap around before the resulting coordinates are passed to SetOverlayViewPort().
SetOverlayViewPort() packs the viewport coordinates into 16-bit register fields. The X coordinates are additionally adjusted by +2 and +1 before being written. Validate the coordinate calculations for 32-bit wraparound and ensure that the adjusted coordinates fit within their 16-bit register fields before calling SetOverlayViewPort().
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Which versions are affected by CVE-2026-90245?
How do I fix CVE-2026-90245?
Apply the vendor's patch.
Is CVE-2026-90245 being exploited?
There is no known exploitation of CVE-2026-90245 in the wild and no public exploit code.
Sources
Also known as AZL-102891, BELL-CVE-2026-90245, DEBIAN-CVE-2026-90245, GHSA-74pp-fw2v-5w87, UBUNTU-CVE-2026-90245.