CVE-2009-2698

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2009-08-27 · updated 2026-06-16
Weakness: CWE-476

Description

The udp_sendmsg function in the UDP implementation in (1) net/ipv4/udp.c and (2) net/ipv6/udp.c in the Linux kernel before 2.6.19 allows local users to gain privileges or cause a denial of service (NULL pointer dereference and system crash) via vectors involving the MSG_MORE flag and a UDP socket.

Affected products

Canonical Ubuntu Linux: 6.06, 8.04, 8.10, 9.04 (and their updates)
Fedoraproject Fedora: 10 (and their updates)
Linux kernel: before 2.6.19 — fixed in 2.6.19
RedHat Enterprise Linux Desktop: 4.0, 5.0 (and their updates)
RedHat Enterprise Linux Eus: 4.8, 5.3 (and their updates)
RedHat Enterprise Linux Server: 4.0, 5.0 (and their updates)
RedHat Enterprise Linux Server Aus: 5.3 (and their updates)
RedHat Enterprise Linux Workstation: 4.0, 5.0 (and their updates)
SUSE Linux Enterprise Server 15 SP1: 10-sp2
SUSE Linux Enterprise Server: 10-sp2; 9 (and their updates)
VMware ESXi: 4.0 (and their updates)
VMware vCenter Server: 4.0

How to fix

Upgrade to a fixed version: Linux kernel 2.6.19. Check the vendor advisory for mitigations.

References

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