CVE-2011-2534

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-06-22 · updated 2026-06-16
Weakness: CWE-120

Description

Buffer overflow in the clusterip_proc_write function in net/ipv4/netfilter/ipt_CLUSTERIP.c in the Linux kernel before 2.6.39 might allow local users to cause a denial of service or have unspecified other impact via a crafted write operation, related to string data that lacks a terminating '\0' character.

Affected products

Linux kernel: before 2.6.39 — fixed in 2.6.39

How to fix

Upgrade to a fixed version: Linux kernel 2.6.39. Check the vendor advisory for mitigations.

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=961ed183a9fd080cf306c659b8736007e44065a5
http://marc.info/?l=netfilter&m=129978077509888&w=2
http://marc.info/?l=netfilter-devel&m=130036157327564&w=2
http://securityreason.com/securityalert/8284
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
http://www.openwall.com/lists/oss-security/2011/03/18/15
http://www.openwall.com/lists/oss-security/2011/03/21/1
http://www.openwall.com/lists/oss-security/2011/03/21/4
http://www.securityfocus.com/bid/46921
https://bugzilla.redhat.com/show_bug.cgi?id=689337
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=961ed183a9fd080cf306c659b8736007e44065a5
http://marc.info/?l=netfilter&m=129978077509888&w=2

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