CVE-2026-72345

Kernel-state corruption via off-by-one LAG rollback

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper rollback in the mlx5 LAG shared-FDB code in Linux allows local users to corrupt kernel state during a rule-installation failure. Following an add failure, mlx5_lag_create_single_fdb() begins reverse cleanup at the failed entry rather than at the preceding successful entry, causing access to uninitialized state or duplicate rule teardown. Reachability requires local access, an mlx5 multiport E-Switch using shared-FDB LAG, and a failure during rule installation; the resulting corruption can interrupt service.

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

Improper rollback in the mlx5 LAG shared-FDB code in Linux allows local users to corrupt kernel state during a rule-installation failure. Following an add failure, mlx5_lag_create_single_fdb() begins reverse cleanup at the failed entry rather than at the preceding successful entry, causing access to uninitialized state or duplicate rule teardown. Reachability requires local access, an mlx5 multiport E-Switch using shared-FDB LAG, and a failure during rule installation; the resulting corruption can interrupt service.

The record

CVE
CVE-2026-72345
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-665
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=6.14
  2. Affected versionversion=ddbb5ddc43ad000a984149db5af1133433938404 <0f0e4ae6975c773f7854fc48932a267f6c79088f
  3. Affected versionversion=ddbb5ddc43ad000a984149db5af1133433938404 <40cc06bf71476932e5d139fa326dcd0372766e16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=ddbb5ddc43ad000a984149db5af1133433938404 <0f0e4ae6975c773f7854fc48932a267f6c79088f; version=ddbb5ddc43ad000a984149db5af1133433938404 <40cc06bf71476932e5d139fa326dcd0372766e16

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H
4.7SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/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-665Improper Initialization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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