Vulnerability identifier: #VU44040

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-2699

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 3.0 - 3.0.101

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External links
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=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
http://bugzilla.redhat.com/show_bug.cgi?id=723429
http://github.com/torvalds/linux/commit/87c48fa3b4630905f98268dde838ee43626a060c

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.