CVE-2025-40330

Kernel memory corruption via lingering firmware DMA

Published Dec 9, 2025 · Updated May 11, 2026

Memory corruption in the bnxt_en driver in Linux 6.13 through 6.17.7 allows local users to disrupt a newly booted kernel via kexec. The bnxt_shutdown() path calls netif_close(), which stops packet DMA but leaves firmware trace-logging DMA active across the kernel transition. Exploitation requires a Broadcom bnxt device using firmware trace logging and privileged kexec access; continued DMA can corrupt new-kernel memory and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the bnxt_en driver in Linux 6.13 through 6.17.7 allows local users to disrupt a newly booted kernel via kexec. The bnxt_shutdown() path calls netif_close(), which stops packet DMA but leaves firmware trace-logging DMA active across the kernel transition. Exploitation requires a Broadcom bnxt device using firmware trace logging and privileged kexec access; continued DMA can corrupt new-kernel memory and interrupt service.

The record

CVE
CVE-2025-40330
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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.

  1. Affected versionversion=24d694aec139e9e0a31c60993db79bd8ad575afe <1a8a15c3f71d1199d510ccba4bc201cbd2204048
  2. Affected versionversion=24d694aec139e9e0a31c60993db79bd8ad575afe <bc7208ca805ae6062f353a4753467d913d963bc6
  3. Affected versionversion=6.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=24d694aec139e9e0a31c60993db79bd8ad575afe <1a8a15c3f71d1199d510ccba4bc201cbd2204048; version=24d694aec139e9e0a31c60993db79bd8ad575afe <bc7208ca805ae6062f353a4753467d913d963bc6; version=6.13

Published CVSS scores

5.2OracleCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H
5.5SUSECVSS: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

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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
Privilegesadmin
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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