CVE-2026-93077 cxl/features: Clamp Get Feature output size to the remaining buffer
A buffer overflow in the Linux kernel CXL feature driver allows local attackers to corrupt memory and potentially execute code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93077?
CVE-2026-93077 is a memory corruption 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:
cxl/features: Clamp Get Feature output size to the remaining buffer
cxl_get_feature() reads a feature in a loop but passes a fixed size_out as the output capacity every iteration. On the last partial iteration the buffer has less room left, so a device that returns more than asked can overflow feat_out.
Use the per-iter size data_to_rd_size, which already tracks the remaining room, as the output capacity.
Which versions are affected by CVE-2026-93077?
How do I fix CVE-2026-93077?
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-2026-93077 being exploited?
There is no known exploitation of CVE-2026-93077 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93077, DEBIAN-CVE-2026-93077, GHSA-qp96-h2xq-qgj3, UBUNTU-CVE-2026-93077.