CVE catalog

CVE-2026-75883

network-manager-l2tp: CVE-2026-75883

Severity: Medium · CVSS 6.8CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: Sep 17, 2026, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.18% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	ppp	sid	`2.5.2-1+2`	vulnerable
Debian	ppp	forky	`2.5.2-1+2`	vulnerable
Debian	ppp	trixie	`2.5.2-1+1`	vulnerable
Debian	ppp	bookworm	`2.4.9-1+1.1`	not affected

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ppp	source	sid	`(unfixed)`	not yet assigned	Not reported	[1148816]
Debian	ppp	source	forky	`(unfixed)`	not yet assigned	Not reported	[1148816]
Debian	ppp	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1148816]
Debian	ppp	source	bookworm	`Not affected`	unimportant	Not reported	[1148816]

[Debian bug #1148816]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[network-manager-l2tp]Affected
Details (2)
- 1.20.8-1 · amd64 · bookworm
  Affected · Fixed: 1.20.8-1+deb12u1
  dsa · network-manager-l2tp · debian · bookworm
- 1.20.8-1 · arm64 · bookworm
  Affected · Fixed: 1.20.8-1+deb12u1
  dsa · network-manager-l2tp · debian · bookworm
[network-manager-l2tp-gnome]Affected
Source package: [network-manager-l2tp]
Details (2)
- 1.20.8-1 · amd64 · bookworm
  Affected · Fixed: 1.20.8-1+deb12u1
  dsa · network-manager-l2tp · debian · bookworm
- 1.20.8-1 · arm64 · bookworm
  Affected · Fixed: 1.20.8-1+deb12u1
  dsa · network-manager-l2tp · debian · bookworm
[ppp]Not affected
Source package: [ppp]
Details (2)
- 2.4.9-1+1.1+b1 · amd64 · bookworm
  Not affected
  dsa · ppp · debian · bookworm
- 2.4.9-1+1.1+b1 · arm64 · bookworm
  Not affected
  dsa · ppp · debian · bookworm
[ppp-dev]Not affected
Source package: [ppp]
Details (2)
- 2.4.9-1+1.1 · all · bookworm
  Not affected
  dsa · ppp · debian · bookworm
- 2.4.9-1+1.1 · all · bookworm
  Not affected
  dsa · ppp · debian · bookworm

[Debian 13 (Trixie)]

[ppp]Affected
Details (2)
- 2.5.2-1+1 · amd64 · trixie
  Affected
  dsa · ppp · debian · 13
- 2.5.2-1+1 · arm64 · trixie
  Affected
  dsa · ppp · debian · 13
[ppp-dev]Affected
Source package: [ppp]
Details (2)
- 2.5.2-1+1 · all · trixie
  Affected
  dsa · ppp · debian · 13
- 2.5.2-1+1 · all · trixie
  Affected
  dsa · ppp · debian · 13

Observed: Oct 27, 2026, 5:44:30 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]