CVE-2023-26545

Local crash via stale MPLS sysctl pointer

Published Feb 25, 2023 · Updated Mar 20, 2025

Double free in Linux kernel before 6.1.13 allows local users to crash the kernel while renaming an MPLS-enabled network device. After sysctl registration fails, mpls_dev_sysctl_register leaves mdev->sysctl pointing to freed memory, which unregister cleanup frees again. The path requires low-privileged local access, an MPLS-enabled device rename, and a sysctl-table allocation failure; the documented impact is service interruption.

CVSS severity4.7
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in Linux kernel before 6.1.13 allows local users to crash the kernel while renaming an MPLS-enabled network device. After sysctl registration fails, mpls_dev_sysctl_register leaves mdev->sysctl pointing to freed memory, which unregister cleanup frees again. The path requires low-privileged local access, an MPLS-enabled device rename, and a sysctl-table allocation failure; the documented impact is service interruption.

The record

CVE
CVE-2023-26545
Published
Feb 25, 2023
Updated
Mar 20, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.7OracleCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CISA-ADPCVSS:3.1/AV:L/AC:H/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-415Double Free
T1499.004Application or System Exploitation

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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