SB20260812122 - Use-after-free in Linux kernel net ppp driver

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Main Vulnerability Database SB20260812122

SB20260812122 - Use-after-free in Linux kernel net ppp driver

Published: August 12, 2026

Security Bulletin ID SB20260812122
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-68398)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service or execute arbitrary code.

The vulnerability exists due to a use-after-free in pppol2tp_recv() and PPP channel handling when processing pppol2tp receive traffic concurrently with channel teardown. A local user can trigger concurrent receive and close operations to cause a denial of service or execute arbitrary code.

The issue is reachable by an unprivileged user and affects a channel that is bound but not attached to a PPP unit and not bridged.


Remediation

Install update from vendor's website.

References