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pppd (ppp) CVE-2026-91838

MEDIUM
2026-09-17 vendor:ubuntu
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Severity by source

vuln.today AI
7.8 HIGH

Local vector since the attacker shapes on-host profile data (AV:L); low-privileged user can inject (PR:L) with no interaction; root pppd execution gives full C/I/A:H.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Lifecycle Timeline

4
Metadata Corrected
Sep 17, 2026 - 08:40 vuln.today
tag: Ubuntu added
Metadata Corrected
Sep 17, 2026 - 08:40 vuln.today
tag: Linux added
Analysis Generated
Sep 17, 2026 - 08:12 vuln.today
CVE Published
Sep 17, 2026 - 00:00 cve.org
MEDIUM

DescriptionCVE.org

[profile data reaches root pppd pty shell]

AnalysisAI

Attacker-influenced connection profile data can be routed into pppd's root-context pty/shell invocation in the ppp package (reported by Ubuntu), potentially letting a local user obtain code execution with the privileges of the pppd process. Our independent assessment scores this CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - local access is required, a connection must be initiated, and the target must actually use pppd for PPP/DSL/dial-up/mobile-broadband/VPN links, so exploitability is limited by how niche PPP is on modern systems; exploitation is not passive against a default configuration. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires local access to a system running pppd (the ppp package) where attacker-influenced profile/connection data is passed into pppd's pty or shell invocation - for example a NetworkManager PPP/DSL/mobile-broadband/VPN connection profile, or a pppd 'pty'/chat script parameter. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Data for this CVE is severely limited: no CVSS score, no CVSS vector, and no CWE were provided, and the only source is an Ubuntu vendor report with a one-line description. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch was identified at time of analysis, so remediation must start with compensating controls. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-91838 vulnerability details – vuln.today

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