Bug 2487363 (CVE-2026-46433) - CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read when processing VLAN-tagged Ethernet frames
Summary: CVE-2026-46433 lldpd: lldpd: Denial of Service due to heap buffer over-read w...
Keywords:
Status: NEW
Alias: CVE-2026-46433
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2488318 2488321
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-09 23:02 UTC by OSIDB Bzimport
Modified: 2026-06-12 11:12 UTC (History)
2 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-09 23:02:36 UTC 
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.
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