CVE-2011-3188

Critical

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.

Package Linux Kernel
Published 2012-05-24
Last modified 2026-04-29
CVSS version 3.1
Patch available
Awaiting data

CVSS 3.1 score

9.1

out of 10
Critical
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
High
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

The following references provide additional information about CVE-2011-3188 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

7 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2011-3188?

    CVE-2011-3188 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.1 out of 10 . CVE-2011-3188 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2011-3188?

    CVE-2011-3188 has a CVSS score of 9.1 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H .

  • Is there a patch available for CVE-2011-3188?

    No patch is currently available for CVE-2011-3188. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

  • Is CVE-2011-3188 actively exploited?

    No — CVE-2011-3188 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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