CVE-2026-31395

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler<br /> <br /> The ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in<br /> bnxt_async_event_process() uses a firmware-supplied &amp;#39;type&amp;#39; field<br /> directly as an index into bp-&gt;bs_trace[] without bounds validation.<br /> <br /> The &amp;#39;type&amp;#39; field is a 16-bit value extracted from DMA-mapped completion<br /> ring memory that the NIC writes directly to host RAM. A malicious or<br /> compromised NIC can supply any value from 0 to 65535, causing an<br /> out-of-bounds access into kernel heap memory.<br /> <br /> The bnxt_bs_trace_check_wrap() call then dereferences bs_trace-&gt;magic_byte<br /> and writes to bs_trace-&gt;last_offset and bs_trace-&gt;wrapped, leading to<br /> kernel memory corruption or a crash.<br /> <br /> Fix by adding a bounds check and defining BNXT_TRACE_MAX as<br /> DBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently<br /> defined firmware trace types (0x0 through 0xc).