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CVE-2026-85495 is a pre-authentication global buffer overflow in pppd's construction of LCP Configure-NAK messages. A PPP link peer can supply repeated PAP-AUTHTYPE options that cause pppd to write beyond the fixed 1500-byte nak_buffer. The condition is reported to affect CHAP-only hardening configurations that reject PAP and EAP.
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A critical-severity, network-accessible vulnerability affecting the PPP package on specified Ubuntu LTS and Debian releases. The supplied CVSS v3 vector indicates no privileges or user interaction are required and potential high impact to confidentiality, integrity, and availability.
A pre-authentication global buffer overflow in pppd LCP Configure-NAK processing. Repeated rejected PAP authentication-type options can amplify output and overflow a fixed static NAK buffer, followed by a copy into the input buffer. It can be triggered by an unauthenticated PPP peer when the victim uses a CHAP-only configuration with PAP and EAP refused.
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Cross-references every affected SKU, including bundled OEM variants.
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