Kernel memory corruption via unchecked firmware trace index
Published Apr 3, 2026 · Updated Apr 3, 2026
Out-of-bounds access in the bnxt_en driver in the Linux kernel allows attackers controlling a Broadcom NIC to corrupt memory or crash. The DBG_BUF_PRODUCER branch in bnxt_async_event_process uses a firmware-supplied 16-bit type directly to index bp->bs_trace without checking that it is at most 0xc. Exploitation requires a malicious or compromised NIC that can write the DMA completion ring; the subsequent wrap check dereferences and updates the out-of-range trace entry.
Summary
What happened
Out-of-bounds access in the bnxt_en driver in the Linux kernel allows attackers controlling a Broadcom NIC to corrupt memory or crash. The DBG_BUF_PRODUCER branch in bnxt_async_event_process uses a firmware-supplied 16-bit type directly to index bp->bs_trace without checking that it is at most 0xc. Exploitation requires a malicious or compromised NIC that can write the DMA completion ring; the subsequent wrap check dereferences and updates the out-of-range trace entry.
The record
- CVE
- CVE-2026-31395
- Published
- Apr 3, 2026
- Updated
- Apr 3, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, T1200
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Apr 3, 2026CVE publishedPublication date reported by the CVE source.
- Apr 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.13
- Affected versionversion=84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 <19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8
- Affected versionversion=84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 <64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3
- Affected versionversion=84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9 <b7c7a275447c6d4bf4a36a134682e2e4e20efd4b
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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