Use-after-free in PPP - #VU151454
Published: September 19, 2026
Vulnerability identifier: #VU151454
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to use-after-free in the pppd EAP-TLS authentication handling when processing an extra EAP-TLS Ack packet after authentication completes. A remote user can send an extra EAP-TLS Ack packet to cause a denial of service.
Exploitation requires a certificate signed by a CA recognized by the local pppd and successful EAP-TLS authentication.
Affected software
PPP
Remediation
Install security update from vendor's website.
PPP - update to 2.5.4