CVE-2026-31395bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler

Official description

In the Linux kernel, the following vulnerability has been resolved: bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler The ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in bnxt_async_event_process() uses a firmware-supplied 'type' field directly as an index into bp->bs_trace[] without bounds validation. The 'type' field is a 16-bit value extracted from DMA-mapped completion ring memory that the NIC writes directly to host RAM. A malicious or compromised NIC can supply any value from 0 to 65535, causing an out-of-bounds access into kernel heap memory. The bnxt_bs_trace_check_wrap() call then dereferences bs_trace->magic_byte and writes to bs_trace->last_offset and bs_trace->wrapped, leading to kernel memory corruption or a crash. Fix by adding a bounds check and defining BNXT_TRACE_MAX as DBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently defined firmware trace types (0x0 through 0xc).

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8
• https://git.kernel.org/stable/c/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b
• https://git.kernel.org/stable/c/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3