lldpd: Heap OOB Read in VLAN Decapsulation memmove
CVE-2026-46433 is fixed in lldpd on 1 platform, first by DEBIAN-CVE-2026-46433, released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| lldpd · Debian 14 | 1.0.22-1 | DEBIAN-CVE-2026-46433 | May 27, 2026 |
| lldpd · opensuse-leap 16.0 | 1.0.22-bp160.1.1 | OPENSUSE-SU-2026:21146-1 | Jun 22, 2026 |
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