CVE-2026-75883
Published: September 17, 2026Last modified: September 26, 2026
Description
The code in pppd that formats a response to a PEAP Request packet in peap_response() copies an entire TLS record of up to 16384 bytes into the fixed global buffer outpacket_buf without checking the available space and without implementing outgoing PEAP fragmentation. Thus a pppd process connecting to a server which requests PEAP authentication can be induced to corrupt global static data following the outpacket_buf array, most likely causing incorrect behavior or a crash.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 6.8 |
| Attack Vector | ADJACENT_NETWORK |
| Attack complexity | HIGH |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | NONE |
| Vector | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | ppp | Not affected (2.4.9-r5) |
| 25 LTS | ppp | Fixed (2.5.4-r0) | |
| Stream | ppp | Fixed (2.5.4-r0) |