CVE-2026-72344

Kernel crash via unchecked LAG sequence lookup

Published Aug 15, 2026 · Updated Aug 15, 2026

NULL pointer dereference in the Linux net/mlx5e traffic-control driver in 7.1.0 through 7.1.4 allows local users to crash the kernel. During LAG teardown, mlx5e_tc_del_fdb_peers_flow and mlx5e_tc_clean_fdb_peer_flows use a negative result from mlx5_lag_get_dev_seq as a peer-flow array index instead of rejecting it. The failure requires mlx5 peer flows and a peer outside the LAG or no device marked as master; the bounded consequence is a kernel crash.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux net/mlx5e traffic-control driver in 7.1.0 through 7.1.4 allows local users to crash the kernel. During LAG teardown, mlx5e_tc_del_fdb_peers_flow and mlx5e_tc_clean_fdb_peer_flows use a negative result from mlx5_lag_get_dev_seq as a peer-flow array index instead of rejecting it. The failure requires mlx5 peer flows and a peer outside the LAG or no device marked as master; the bounded consequence is a kernel crash.

The record

CVE
CVE-2026-72344
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=7.1
  2. Affected versionversion=971b28accc09436fe6a6d5afd667dcbfb3ed7e03 <5a95aa0198af75047d98fb72950642c89dab770f
  3. Affected versionversion=971b28accc09436fe6a6d5afd667dcbfb3ed7e03 <7bed4af0ced82948d660205efecd551ef8bc3912

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=7.1; version=971b28accc09436fe6a6d5afd667dcbfb3ed7e03 <5a95aa0198af75047d98fb72950642c89dab770f; version=971b28accc09436fe6a6d5afd667dcbfb3ed7e03 <7bed4af0ced82948d660205efecd551ef8bc3912

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-476NULL Pointer Dereference
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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