CVE-2026-46433
published 2026-06-09CVE-2026-46433: 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…
PriorityP427medium6.5CVSS 3.1
AVAACLPRNUINSUCNINAH
EPSS
0.22%
13.2th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| lldpd | lldpd | < 1.0.22 | 1.0.22 |
| lldpd_project | lldpd | < 1.0.22 | 1.0.22 |
| lldpd_project | lldpd | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat6.5MEDIUM
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Bugzilla
CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames [fedora-all]
bugzilla·2026-06-12·CVSS 6.5
CVE-2026-46433 [MEDIUM] CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames [fedora-all]
CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames
bugzilla·2026-06-09·CVSS 6.5
CVE-2026-46433 [MEDIUM] CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames
CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames
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.
2026-06-09
Published