CVE-2011-2699

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-05-24 · updated 2026-06-16

Description

The IPv6 implementation in the Linux kernel before 3.1 does not generate Fragment Identification values separately for each destination, which makes it easier for remote attackers to cause a denial of service (disrupted networking) by predicting these values and sending crafted packets.

Affected products

Linux kernel: before 3.1 — fixed in 3.1
Red Hat Enterprise Linux: 4.0
RedHat Enterprise Mrg: 2.0

How to fix

Upgrade to a fixed version: Linux kernel 3.1. Check the vendor advisory for mitigations.

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=87c48fa3b4630905f98268dde838ee43626a060c
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
http://www.openwall.com/lists/oss-security/2011/07/20/5
http://www.securitytracker.com/id?1027274
https://bugzilla.redhat.com/show_bug.cgi?id=723429
https://github.com/torvalds/linux/commit/87c48fa3b4630905f98268dde838ee43626a060c
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=87c48fa3b4630905f98268dde838ee43626a060c
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
http://www.openwall.com/lists/oss-security/2011/07/20/5
http://www.securitytracker.com/id?1027274

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