CVE-2011-4326: Avaya 96x1 IP Deskphone Firmware

High severity, CVSS 7.1. EPSS: 3.2% chance of exploitation in the next 30 days.

The udp6_ufo_fragment function in net/ipv6/udp.c in the Linux kernel before 2.6.39, when a certain UDP Fragmentation Offload (UFO) configuration is enabled, allows remote attackers to cause a denial of service (system crash) by sending fragmented IPv6 UDP packets to a bridge device.

Affected products

• Avaya 96x1 IP Deskphone Firmware: from 6.0.0, up to and including 6.6.0
• Linux Linux Kernel: before 2.6.39 (fixed in 2.6.39)

Published 2012-05-17. Last modified 2026-06-16.