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CVE-2011-3188· NVD / CVE Program· CNA redhat

The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to generate sequence numbers and Fragm

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.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
May 24, 2012
Updated
Jun 16, 2026
EPSS
5.0% · 92th percentile
CWE
—
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JSON

Action score

38

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.0%

Affected systems

VendorProduct
linuxlinux kernel
redhatenterprise linux
f5arx
f5big-ip access policy manager
f5big-ip analytics
f5big-ip application security manager
f5big-ip edge gateway
f5big-ip global traffic manager
f5big-ip link controller
f5big-ip local traffic manager
f5big-ip protocol security module
f5big-ip wan optimization manager

and 3 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • f5 arx6.0.0 and later · up to 6.4.0 inclusive
  • f5 big-ip access policy manager11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip access policy manager10.1.0 and later · up to 10.2.4 inclusive
  • f5 big-ip analytics11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip application security manager11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip application security manager10.0.0 and later · up to 10.2.4 inclusive
  • f5 big-ip edge gateway10.1.0 and later · up to 10.2.4 inclusive
  • f5 big-ip edge gateway11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip global traffic manager11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip global traffic manager10.0.0 and later · up to 10.2.4 inclusive
  • f5 big-ip link controller10.0.0 and later · up to 10.2.4 inclusive
  • f5 big-ip link controller11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip local traffic manager11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip local traffic manager10.0.0 and later · up to 10.2.4 inclusive
  • f5 big-ip protocol security module10.0.0 and later · up to 10.2.4 inclusive
  • f5 big-ip protocol security module11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip wan optimization manager11.0.0 and later · up to 11.1.0 inclusive
  • f5 big-ip wan optimization manager10.0.0 and later · up to 10.2.4 inclusive
  • f5 big-ip webaccelerator10.0.0 and later · up to 10.2.4 inclusive
  • f5 big-ip webaccelerator11.0.0 and later · up to 11.1.0 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:5.0linux-2.6before 2.6.26-26lenny42.6.26-26lenny4
Debian:6.0linux-2.6before 2.6.32-35squeeze12.6.32-35squeeze1
Red Hat:enterprise_linux:5::clientkernelbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debugbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfo-commonbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-docbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAEbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAE-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAE-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-xenbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-xen-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::clientkernel-xen-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::serverkernel-kdumpbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::serverkernel-kdump-debuginfobefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:5::serverkernel-kdump-develbefore 0:2.6.18-274.7.1.el50:2.6.18-274.7.1.el5
Red Hat:enterprise_linux:6::serverkernelbefore 0:2.6.32-131.21.1.el60:2.6.32-131.21.1.el6
Red Hat:enterprise_linux:6::serverkernel-bootwrapperbefore 0:2.6.32-131.21.1.el60:2.6.32-131.21.1.el6
Red Hat:enterprise_linux:6::serverkernel-debugbefore 0:2.6.32-131.21.1.el60:2.6.32-131.21.1.el6
Red Hat:enterprise_linux:6::serverkernel-debug-debuginfobefore 0:2.6.32-131.21.1.el60:2.6.32-131.21.1.el6
Red Hat:enterprise_linux:6::serverkernel-debug-develbefore 0:2.6.32-131.21.1.el60:2.6.32-131.21.1.el6

+47

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux-2.62.6.32-35squeeze1 · Debian:6.0Package registry (OSV)
red hat:kernel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug-debuginfo0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug-devel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debuginfo0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debuginfo-common0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-devel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-doc0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE-debuginfo0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE-devel0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-xen0:2.6.18-274.7.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days-1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

All records