CVE-2026-93280 greybus: audio: bound the topology section sizes against the fetched size
A malicious Greybus module can trigger out-of-bounds reads in the Linux kernel audio driver by providing inconsistent topology section sizes.
- 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-2026-93280?
CVE-2026-93280 is a high-severity memory corruption vulnerability in Linux, published on 24 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:
greybus: audio: bound the topology section sizes against the fetched size
gb_audio_gb_get_topology() fetches a topology blob of a module-supplied size, and gbaudio_tplg_parse_data() then walks it by adding the module-supplied size_dais, size_controls and size_widgets fields to form the control, widget and route section offsets. Those le32 sizes are never checked against the fetched blob, so a module reporting a small topology size but large section sizes makes the offsets point past the allocation, and parsing reads out of bounds.
Reject a topology whose section sizes do not fit within the fetched size before it is parsed.
Which versions are affected by CVE-2026-93280?
How do I fix CVE-2026-93280?
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-2026-93280 being exploited?
There is no known exploitation of CVE-2026-93280 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-93280, DEBIAN-CVE-2026-93280, GHSA-mwmc-pxhm-4fx8, UBUNTU-CVE-2026-93280.