CVE-2026-43034

System crash via firmware-controlled array index

Published May 1, 2026 · Updated May 1, 2026

Out-of-bounds array access in the Linux Kernel bnxt_en driver allows local users to crash systems through a malformed firmware response. bnxt_hwrm_func_backing_store_qcaps_v2 stores resp->type and later uses it to index fixed ctx_arr and bnxt_bstore_to_trace metadata arrays instead of using the bounded query type. The published record does not identify how a local user causes the firmware mismatch; the reported consequence is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds array access in the Linux Kernel bnxt_en driver allows local users to crash systems through a malformed firmware response. bnxt_hwrm_func_backing_store_qcaps_v2 stores resp->type and later uses it to index fixed ctx_arr and bnxt_bstore_to_trace metadata arrays instead of using the bounded query type. The published record does not identify how a local user causes the firmware mismatch; the reported consequence is limited to availability.

The record

CVE
CVE-2026-43034
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.8
  2. Affected versionversion=6a4d0774f02d61f8c75ffe2e38a8553410fe52e9 <29732b68a6816a815d58e9ab229844c23617e1e0
  3. Affected versionversion=6a4d0774f02d61f8c75ffe2e38a8553410fe52e9 <4ee937107d52f9e5c350e4b5e629760e328b3d9f
  4. Affected versionversion=6a4d0774f02d61f8c75ffe2e38a8553410fe52e9 <c8d53b70166d1dc463ef42adb7293e1a770822c7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.8; version=6a4d0774f02d61f8c75ffe2e38a8553410fe52e9 <29732b68a6816a815d58e9ab229844c23617e1e0; version=6a4d0774f02d61f8c75ffe2e38a8553410fe52e9 <4ee937107d52f9e5c350e4b5e629760e328b3d9f; version=6a4d0774f02d61f8c75ffe2e38a8553410fe52e9 <c8d53b70166d1dc463ef42adb7293e1a770822c7

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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