-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:60.ppp Security Advisory The FreeBSD Project Topic: Multiple vulnerabilities in ppp(8) Category: core Module: ppp Announced: 2026-08-25 Credits: Robert Morris Credits: Décio Brandão (0xDBJ) Credits: Joshua Rogers Credits: Reo Shiseki Affects: All supported versions of FreeBSD. Corrected: 2026-08-24 18:47:44 UTC (stable/15, 15.1-STABLE) 2026-08-25 16:01:27 UTC (releng/15.1, 15.1-RELEASE-p3) 2026-08-25 16:01:07 UTC (releng/15.0, 15.0-RELEASE-p13) 2026-08-24 18:49:06 UTC (stable/14, 14.4-STABLE) 2026-08-25 16:00:28 UTC (releng/14.4, 14.4-RELEASE-p9) CVE Name: CVE-2026-58095, CVE-2026-58096, CVE-2026-58097 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background ppp(8) is a user-space Point-to-Point Protocol (PPP) implementation used to establish network connections over serial and dial-up links. It supports the Multilink PPP (MP) extension, which uses endpoint discriminators to identify individual links within a bundle. The ppp(8) executable is installed setuid root. However, unprivileged users must belong to the "network" group in order to execute it. II. Problem Description ppp(8) contained three memory safety errors in its handling of multilink endpoint discriminator options. mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, allowing a received endpoint option to overflow a global result buffer. [CVE-2026-58095] LcpDecodeConfig() did not validate the length of received endpoint discriminator options against the minimum required by RFC 1717. Undersized options would trigger an out-of-bounds write. [CVE-2026-58096] mp_SetEnddisc() copied a user-supplied PSN endpoint value without length validation, allowing a buffer overflow via the ppp(8) command interface. [CVE-2026-58097] III. Impact A malicious PPP peer can exploit CVE-2026-58095 and CVE-2026-58096 to crash ppp(8) or potentially execute arbitrary code as root. A local user with access to the ppp(8) command interface can exploit CVE-2026-58097 similarly. IV. Workaround No workaround is available. Systems that do not use ppp(8) are not affected. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Restart any running ppp(8) instances, or reboot the system. Perform one of the following: 1) To update your vulnerable system installed from base system packages: Systems running a 15.0-RELEASE or later version of FreeBSD on the amd64 or arm64 platforms, which were installed using base system packages, can be updated via the pkg(8) utility: # pkg upgrade -r FreeBSD-base 2) To update your vulnerable system installed from binary distribution sets: Systems running a RELEASE version of FreeBSD on the amd64 or arm64 platforms which were not installed using base system packages can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-26:60/ppp.patch # fetch https://security.FreeBSD.org/patches/SA-26:60/ppp.patch.asc # gpg --verify ppp.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch -E -p0 < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in . Restart any running ppp(8) instances, or reboot the system. VI. Correction details This issue is corrected as of the corresponding Git commit hash in the following stable and release branches: Branch/path Hash Revision - ------------------------------------------------------------------------- stable/15/ dd2da2552346 stable/15-n285097 releng/15.1/ 5c00c1e02276 releng/15.1-n283607 releng/15.0/ 4ad6d3b4ccb3 releng/15.0-n281110 stable/14/ 55ee29bf3515 stable/14-n275008 releng/14.4/ 8544e4ce677f releng/14.4-n273762 - ------------------------------------------------------------------------- Run the following command to see which files were modified by a particular commit: # git show --stat Or visit the following URL, replacing NNNNNN with the hash: To determine the commit count in a working tree (for comparison against nNNNNNN in the table above), run: # git rev-list --count --first-parent HEAD VII. References The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- iQJPBAEBCgA5FiEEthUnfoEIffdcgYM7bljekB8AGu8FAmqN3YQbFIAAAAAABAAO bWFudTIsMi41KzEuMTIsMCwzAAoJEG5Y3pAfABrvvPYQANXkWvyq4g1fp8gBmB2u M7YUa9Q63BC9Ys0UbZfXlJ0xLpb3xXpmhz4C47xPU6FdgSdt9pQmAk9UydAprP+h 6Zn6WFBwbwwOqq2mBpw1Y3TE5HJOM43AlvzyoA7aFcZRZCMJFelFxn1RMo75LCXI lF6b23xPgNgw+VXNBFusazZR5EiN7P+RX0eNNr9RFfbGa3oUXUgxZosa2cKDofnl FIYFbIldADtbhQ5V15GKppMcnWcwuNiYmpccjf8uzncfyPeVJvqb4g9WCDTA19aB CATPJFzv18tIR8FS4AV8HHt8Rxf88D8GlAfC26xYpF99Etu6lRgfAR15U1VznkBP defcxFlmPUNBCWSoSGeSecCSUxnxaRLVTzXfrmnUYSKjgnCh62AAV4KT9R0PxoAs rM65OozSHWYkSYDn4l4e/vwqkLMzti5fW8NBoT7z5q3ylFg4bCCeTwS7dCfAn7kZ zrVasxzMsyxVi3O5VspKHw4lYhdTnfsbMBV4tg7B64FojU+p+vbMIbiOT6rW35pH aoEDv3t3b2zorWoqLfYlVY/NPedWzRQMAH6sos5xC/y1Ik4ebSeS3oR3W8p82uCW dFFAuKda6quDN2VaER0QmSRj8GFpgNV9IoE+2U9UIdha9YPODeW6ni1g9p8YuivV +IzXdn1MTSsUdC7+f84Ti8kW =+RRe -----END PGP SIGNATURE-----