Linux Kernel OOB Access in bnxt_en Async Event Handler
CVE-2026-31395 Published on April 3, 2026
bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler
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).
Products Associated with CVE-2026-31395
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Affected Versions
Linux:- Version 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 and below 19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8 is affected.
- Version 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 and below b7c7a275447c6d4bf4a36a134682e2e4e20efd4b is affected.
- Version 84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 and below 64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3 is affected.
- Version 6.13 is affected.
- Before 6.13 is unaffected.
- Version 6.18.20, <= 6.18.* is unaffected.
- Version 6.19.10, <= 6.19.* is unaffected.
- Version 7.0-rc5, <= * is unaffected.