CVE-2026-80706 can: softing: fw_parse(): validate firmware record spans
A missing bounds check in the Linux kernel CAN softing driver allows out-of-bounds reads and writes via crafted firmware, potentially leading to code execution or crashes.
- 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-2026-80706?
CVE-2026-80706 is a high-severity memory corruption vulnerability in Linux, published on 28 Aug 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:
can: softing: fw_parse(): validate firmware record spans
fw_parse() reads a fixed record header, a firmware-provided payload, and a trailing checksum without knowing the end of the firmware blob. A truncated record can therefore make those reads exceed the blob.
The same record also supplies addresses and lengths for writes into DPRAM. The generic loader uses wrap-prone mixed signed arithmetic for its bounds check, while the application loader does not bound the staging copy at all.
Pass the firmware end to the parser and validate the full source record. Use a signed wide offset for generic DPRAM records and validate the application staging span against the mapped DPRAM before copying.
Which versions are affected by CVE-2026-80706?
How do I fix CVE-2026-80706?
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-2026-80706 being exploited?
There is no known exploitation of CVE-2026-80706 in the wild and no public exploit code.
Sources
Also known as AZL-98099, BELL-CVE-2026-80706, DEBIAN-CVE-2026-80706, GHSA-q4rv-gqhg-3pm9, UBUNTU-CVE-2026-80706.