CVE-2024-43864

Kernel panic via failed modify-header replacement

Published Aug 20, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel mlx5e driver allows local users to crash the system through a connection-tracking entry update. When replacement modify-header allocation fails, the update path retains an error pointer for later deallocation and loses the old context. Reachability requires local low-privileged access, mlx5e connection tracking, and exhaustion of the firmware's modify-header capacity; the reported consequence is a kernel panic.

CVSS severity9.8
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel mlx5e driver allows local users to crash the system through a connection-tracking entry update. When replacement modify-header allocation fails, the update path retains an error pointer for later deallocation and loses the old context. Reachability requires local low-privileged access, mlx5e connection tracking, and exhaustion of the firmware's modify-header capacity; the reported consequence is a kernel panic.

The record

CVE
CVE-2024-43864
Published
Aug 20, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=6.3
  2. Affected versionversion=94ceffb48eac7692677d8093dcde6965b70c4b35 <025f2b85a5e5a46df14ecf162c3c80a957a36d0b
  3. Affected versionversion=94ceffb48eac7692677d8093dcde6965b70c4b35 <89064d09c56b44c668509bf793c410484f63f5ad
  4. Affected versionversion=94ceffb48eac7692677d8093dcde6965b70c4b35 <daab2cc17b6b6ab158566bba037e9551fd432b59

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=94ceffb48eac7692677d8093dcde6965b70c4b35 <025f2b85a5e5a46df14ecf162c3c80a957a36d0b; version=94ceffb48eac7692677d8093dcde6965b70c4b35 <89064d09c56b44c668509bf793c410484f63f5ad; version=94ceffb48eac7692677d8093dcde6965b70c4b35 <daab2cc17b6b6ab158566bba037e9551fd432b59

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

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