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

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

https://cvefeed.io/rssfeed/latest.atom / Fri, 04/03/2026 - 21:10
CVE ID :CVE-2026-31395
Published : April 3, 2026, 4:16 p.m. | 2 hours, 50 minutes ago
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).
Severity: 0.0 | NA
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