Stack-based buffer overflow in PPP - #VU151449
Published: September 19, 2026
Vulnerability identifier: #VU151449
CSH Severity: Low
CVSS v4: 7.2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to a stack-based buffer overflow in the radius plugin's stack arrays used to format outgoing RADIUS packets when formatting an outgoing RADIUS packet after processing multiple avpair command-line options. A local user can supply numerous avpair command-line options to escalate privileges.
Exploitation requires pppd to be installed setuid-root and a file under /etc/ppp/peers to enable loading radius.so for an unprivileged user.
Affected software
PPP
Remediation
Install security update from vendor's website.
PPP - update to 2.5.4