CVE-2026-80706: can: softing: fw_parse(): validate firmware record spans
In the Linux kernel, the following vulnerability has been resolved:
can: softing: fwparse(): validate firmware record spans
fwparse() 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.
Affected Software
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
Systems that use the Linux kernel Softing CAN driver and load firmware through its firmware parser are the relevant exposure scope. The issue concerns processing of firmware records and writes into DPRAM.
What kind of firmware input can trigger the flaw?
A truncated firmware record can cause reads beyond the end of the firmware blob. Firmware-supplied record addresses and lengths can also reach unsafe DPRAM write paths because the generic loader's bounds arithmetic can wrap and the application loader did not bound its staging copy.