CVE-2011-1093: Linux Kernel

High severity, CVSS 7.8. EPSS: 3.5% chance of exploitation in the next 30 days.

The dccp_rcv_state_process function in net/dccp/input.c in the Datagram Congestion Control Protocol (DCCP) implementation in the Linux kernel before 2.6.38 does not properly handle packets for a CLOSED endpoint, which allows remote attackers to cause a denial of service (NULL pointer dereference and OOPS) by sending a DCCP-Close packet followed by a DCCP-Reset packet.

Affected products

• Linux Linux Kernel: before 2.6.38 (fixed in 2.6.38)
• Red Hat Enterprise Linux Aus: version 5.6 only
• Red Hat Enterprise Linux Desktop: version 5.0 only
• Red Hat Enterprise Linux Eus: version 5.6 only
• Red Hat Enterprise Linux Server: version 5.0 only
• Red Hat Enterprise Linux Workstation: version 5.0 only

Published 2011-07-18. Last modified 2026-06-16.