| Name | CVE-2026-46433 |
| Description | lldpd is an implementation of IEEE 802.1ab (LLDP). Prior to version 1.0.22, lldpd_decode() in src/daemon/lldpd.c strips 802.1Q VLAN tags from received Ethernet frames by calling memmove() to shift the frame payload 4 bytes left. The third argument (byte count) is s - 2 * ETHER_ADDR_LEN but should be s - 2 * ETHER_ADDR_LEN - 4, causing a 4-byte heap buffer over-read past the malloc(h_mtu) allocation when the received frame size equals the interface MTU. This issue has been patched in version 1.0.22. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| lldpd (PTS) | bullseye (security), bullseye | 1.0.11-1+deb11u2 | vulnerable |
| bookworm, bookworm (security) | 1.0.16-1+deb12u1 | vulnerable |
| trixie | 1.0.18-1 | vulnerable |
| forky, sid | 1.0.22-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| lldpd | source | (unstable) | 1.0.22-1 | | | |
Notes
[trixie] - lldpd <no-dsa> (Minor issue)
[bookworm] - lldpd <no-dsa> (Minor issue)
[bullseye] - lldpd <postponed> (Minor issue, OOB read / DoS)
https://github.com/lldpd/lldpd/security/advisories/GHSA-2g8p-2h3j-63m3
https://github.com/lldpd/lldpd/pull/787
Fixed by: https://github.com/lldpd/lldpd/commit/ca931be63a9cae0fcd8e9b6ae4e916d49f141cd6 (1.0.22)