CVE-2026-53262

Use-after-free via raced PPPoL2TP session access

Published Jun 25, 2026 · Updated Jun 25, 2026

Use-after-free in the Linux Kernel L2TP subsystem allows local users to dereference freed session memory through a raced PPPoL2TP ioctl. The pppol2tp_ioctl() path reads sk_user_data without locking or taking a session reference, then copy_from_user() can sleep while a concurrent close queues the session for deletion. The race requires low-privileged local access to issue the ioctl, delay the copy with a page fault, and close the socket before execution resumes.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux Kernel L2TP subsystem allows local users to dereference freed session memory through a raced PPPoL2TP ioctl. The pppol2tp_ioctl() path reads sk_user_data without locking or taking a session reference, then copy_from_user() can sleep while a concurrent close queues the session for deletion. The race requires low-privileged local access to issue the ioctl, delay the copy with a page fault, and close the socket before execution resumes.

The record

CVE
CVE-2026-53262
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=2.6.35
  2. Affected versionversion=fd558d186df2c13a22455373858bae634a4795af <62f327e287cf7b595ae3f73ba72f5cd2a9e9f39f
  3. Affected versionversion=fd558d186df2c13a22455373858bae634a4795af <78cdfdca88cbf731a92f3b9ee5427c633dd94e28
  4. Affected versionversion=fd558d186df2c13a22455373858bae634a4795af <a213a8950414c684999dcf03edeea6c46ede172e
  5. Affected versionversion=fd558d186df2c13a22455373858bae634a4795af <e251d4cdfc725c9e7d686161e3b775a0e7d95053

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.35; version=fd558d186df2c13a22455373858bae634a4795af <62f327e287cf7b595ae3f73ba72f5cd2a9e9f39f; version=fd558d186df2c13a22455373858bae634a4795af <78cdfdca88cbf731a92f3b9ee5427c633dd94e28; version=fd558d186df2c13a22455373858bae634a4795af <a213a8950414c684999dcf03edeea6c46ede172e; version=fd558d186df2c13a22455373858bae634a4795af <e251d4cdfc725c9e7d686161e3b775a0e7d95053

Published CVSS scores

7.8Linux KernelCVSS: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 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

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

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Your stack

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