What’s Vulnerable › Vulnerabilities
CVE-2011-3188
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 5.0% 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 (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to generate sequence numbers and Fragment Identification values, which makes it easier for remote attackers to cause a denial of service (disrupted networking) or hijack network sessions by predicting these values and sending crafted packets.
Affected products
- F5 Arx: from 6.0.0 through 6.4.0
- F5 BIG-IP APM: from 10.1.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Big-Ip Analytics: from 11.0.0 through 11.1.0
- BIG-IP ASM: from 10.0.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Big-Ip Edge Gateway: from 10.1.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Big-Ip Global Traffic Manager: from 10.0.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Big-Ip Link Controller: from 10.0.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 BIG-IP (LTM): from 10.0.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Big-Ip Protocol Security Module: from 10.0.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Big-Ip Wan Optimization Manager: from 10.0.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Big-Ip Webaccelerator: from 10.0.0 through 10.2.4; from 11.0.0 through 11.1.0
- F5 Networks, Inc. Enterprise Manager: from 2.1.0 through 2.3.0; 3.0.0
- F5 Firepass: from 6.0.0 through 6.1.0; 7.0.0
- Linux kernel: before 3.1 — fixed in 3.1
- Red Hat Enterprise Linux: 4.0
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=6e5714eaf77d79ae1c8b47e3e040ff5411b717ec
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=bc0b96b54a21246e377122d54569eef71cec535f
- http://marc.info/?l=bugtraq&m=139447903326211&w=2
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
- http://www.openwall.com/lists/oss-security/2011/08/23/2
- https://bugzilla.redhat.com/show_bug.cgi?id=732658
- https://github.com/torvalds/linux/commit/6e5714eaf77d79ae1c8b47e3e040ff5411b717ec
- https://github.com/torvalds/linux/commit/bc0b96b54a21246e377122d54569eef71cec535f
- https://support.f5.com/csp/article/K15301?utm_source=f5support&%3Butm_medium=RSS
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=6e5714eaf77d79ae1c8b47e3e040ff5411b717ec
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=bc0b96b54a21246e377122d54569eef71cec535f
- http://marc.info/?l=bugtraq&m=139447903326211&w=2
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