CVE-2026-72089accel/ivpu: Reject firmware log with size smaller than header

Official description

In the Linux kernel, the following vulnerability has been resolved: accel/ivpu: Reject firmware log with size smaller than header fw_log_from_bo() validates the tracing buffer header_size and that the log fits within the BO, but never checks that log->size is at least log->header_size. fw_log_print_buffer() then computes: u32 data_size = log->size - log->header_size; which underflows to a near-U32_MAX value when firmware reports a log whose size is smaller than its header. That huge data_size defeats the log_start/log_end bounds clamps added by commit dd1311bcf0e6 ("accel/ivpu: Add bounds checks for firmware log indices"), so fw_log_print_lines() reads far past the small real data region of the BO. A size of 0 also makes fw_log_from_bo() advance the offset by 0, causing the callers to loop forever on the same header. Reject logs whose size is smaller than the header (which also rejects size == 0).

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5592a207e158b738d9c1d27f208dbbea13ae7606
• https://git.kernel.org/stable/c/dc9a1cda2e46d0254730a6f93cfe48532895f33c
• https://git.kernel.org/stable/c/257321a1c036da417f5d9c47b95c7e58f62bf263
• https://git.kernel.org/stable/c/6920e62be4c969a68ce4ebc59da68c6cbc9512e5
• https://git.kernel.org/stable/c/ddb44baed257560f192b145ed36cf8c0a412de47