CVE-2024-53121

Kernel panic via unlocked FTE active check

Published Dec 2, 2024 · Updated Aug 5, 2026

A race condition in Linux kernel mlx5 flow steering allows local users to trigger a kernel panic during flow-rule deletion. The fs_core deletion path reads an FTE active flag without holding the FTE lock, so a concurrent same-match addition attaches to an entry being removed and clears its hardware deletion callback prematurely. Triggering the race requires concurrent addition and deletion of rules with the same match value on an mlx5-backed flow table; the resulting panic interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux kernel mlx5 flow steering allows local users to trigger a kernel panic during flow-rule deletion. The fs_core deletion path reads an FTE active flag without holding the FTE lock, so a concurrent same-match addition attaches to an entry being removed and clears its hardware deletion callback prematurely. Triggering the race requires concurrent addition and deletion of rules with the same match value on an mlx5-backed flow table; the resulting panic interrupts the host.

The record

CVE
CVE-2024-53121
Published
Dec 2, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 2, 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=5.1
  2. Affected versionversion=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <094d1a2121cee1e85ab07d74388f94809dcfb5b9
  3. Affected versionversion=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <0d568258f99f2076ab02e9234cbabbd43e12f30e
  4. Affected versionversion=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <5b47c2f47c2fe921681f4a4fe2790375e6c04cdd
  5. Affected versionversion=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <933ef0d17f012b653e9e6006e3f50c8d0238b5ed
  6. Affected versionversion=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <9ca314419930f9135727e39d77e66262d5f7bef6
  7. Affected versionversion=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <a508c74ceae2f5a4647f67c362126516d6404ed9
  8. Affected versionversion=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <bfba288f53192db08c68d4c568db9783fb9cb838

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <094d1a2121cee1e85ab07d74388f94809dcfb5b9; version=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <0d568258f99f2076ab02e9234cbabbd43e12f30e; version=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <5b47c2f47c2fe921681f4a4fe2790375e6c04cdd; version=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <933ef0d17f012b653e9e6006e3f50c8d0238b5ed; version=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <9ca314419930f9135727e39d77e66262d5f7bef6; version=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <a508c74ceae2f5a4647f67c362126516d6404ed9; version=718ce4d601dbf73b5dbe024a88c9e34168fe87f2 <bfba288f53192db08c68d4c568db9783fb9cb838

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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

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Your stack

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