CVE-2026-23099

Kernel memory disclosure via non-Ethernet 802.3ad bonding

Published Feb 4, 2026 · Updated Feb 4, 2026

An out-of-bounds read in affected Linux Kernel branches starting at 2.6.24 allows local users to disclose kernel memory via an invalid bond. bond_enslave accepts a non-Ethernet slave for an 802.3ad bond, after which dev_mc_add uses the slave address length to copy lacpdu_mcast_addr and reads past that global object. Exploitation requires local access and permission to reconfigure network links; the read can disclose adjacent kernel data or interrupt the system.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

An out-of-bounds read in affected Linux Kernel branches starting at 2.6.24 allows local users to disclose kernel memory via an invalid bond. bond_enslave accepts a non-Ethernet slave for an 802.3ad bond, after which dev_mc_add uses the slave address length to copy lacpdu_mcast_addr and reads past that global object. Exploitation requires local access and permission to reconfigure network links; the read can disclose adjacent kernel data or interrupt the system.

The record

CVE
CVE-2026-23099
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.24
  2. Affected versionversion=872254dd6b1f80cb95ee9e2e22980888533fc293 <43dee6f7ef1d228821de1b61c292af3744c8d7da
  3. Affected versionversion=872254dd6b1f80cb95ee9e2e22980888533fc293 <80c881e53a4fa0a80fa4bef7bc0ead0e8e88940d
  4. Affected versionversion=872254dd6b1f80cb95ee9e2e22980888533fc293 <c84fcb79e5dbde0b8d5aeeaf04282d2149aebcf6
  5. Affected versionversion=872254dd6b1f80cb95ee9e2e22980888533fc293 <ef68afb1bee8d35a18896c27d7358079353d8d8a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.24; version=872254dd6b1f80cb95ee9e2e22980888533fc293 <43dee6f7ef1d228821de1b61c292af3744c8d7da; version=872254dd6b1f80cb95ee9e2e22980888533fc293 <80c881e53a4fa0a80fa4bef7bc0ead0e8e88940d; version=872254dd6b1f80cb95ee9e2e22980888533fc293 <c84fcb79e5dbde0b8d5aeeaf04282d2149aebcf6; version=872254dd6b1f80cb95ee9e2e22980888533fc293 <ef68afb1bee8d35a18896c27d7358079353d8d8a

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

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

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo