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CVE-2026-80706: can: softing: fw_parse(): validate firmware record spans

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-10-16

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.

Affected products

• Linux kernel: 2.6.38 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2ee477e541a6d5e434d6a4041c6b677ab42e1d82
• https://git.kernel.org/stable/c/808ed899dcf8bdef66894fda5eb7ee4bb0eb8dc1
• https://git.kernel.org/stable/c/84c850b08fc0d671c245144b619683129b55690a
• https://git.kernel.org/stable/c/856d6cb04e5407523566b075841dcd6423757d1c
• https://git.kernel.org/stable/c/ad331e26fd213a19fee0de18cdacd67b7ff5b478
• https://git.kernel.org/stable/c/ae588e5b9cc268de1aabf30f939f0870717ca164
• https://git.kernel.org/stable/c/d0eac0ea7cf493e787fd7b4a556e43ef03cb4b50
• https://git.kernel.org/stable/c/f6d9a6a9512430b395a1940d7b216394fd02d30b

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