CVE-2011-3188

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 6%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
92.1%
KEV
Not listed

Published

May 24, 2012

Last Modified

April 29, 2026

Advisory Details (7)

Auto-updated Apr 29, 2026
Patch available. Sources: redhat.
generic

myF5

https://support.f5.com/csp/article/K15301?utm_source=f5support&amp%3Butm_medium=RSS
generic

crypto: Move md5_transform to lib/md5.c · torvalds/linux@bc0b96b · GitHub

https://github.com/torvalds/linux/commit/bc0b96b54a21246e377122d54569eef71cec535f
generic

net: Compute protocol sequence numbers and fragment IDs using MD5. · torvalds/linux@6e5714e · GitHub

https://github.com/torvalds/linux/commit/6e5714eaf77d79ae1c8b47e3e040ff5411b717ec
redhat Patch Available

732658 – (CVE-2011-3188) CVE-2011-3188 kernel: net: improve sequence number generation

Affected: Red Hat Enterprise Linux 4, 5, 6, and Red Hat Enterprise MRG. It has been addressed in Red Hat Enterprise Linux 5, 6, and Red

https://bugzilla.redhat.com/show_bug.cgi?id=732658
generic

oss-security - Re: CVE request: kernel: change in how tcp seq numbers are generated

http://www.openwall.com/lists/oss-security/2011/08/23/2
generic
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
generic

'[security bulletin] HPSBGN02970 rev.1 - HP Rapid Deployment Pack (RDP) or HP Insight Control Server ' - MARC

http://marc.info/?l=bugtraq&m=139447903326211&w=2

Vendor Advisories for CVE-2011-3188(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.38-1209-omap4 (2.6.38-1209.16) @ natty2026-05-29ubuntu
ubuntulinux-image-2.6.38-12-generic (2.6.38-12.51) @ natty2026-05-29ubuntu
ubuntulinux-image-2.6.32-219-dove (2.6.32-219.37) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.38-12-generic (2.6.38-12.51~lucid1) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.32-419-dove (2.6.32-419.37) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.32-319-ec2 (2.6.32-319.39) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.35-903-omap4 (2.6.35-903.25) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.24-29-lpiacompat (2.6.24-29.95) @ hardy2026-05-29ubuntu
ubuntulinux-image-2.6.35-30-virtual (2.6.35-30.61~lucid1) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.35-30-powerpc (2.6.35-30.61) @ maverick2026-05-29ubuntu
ubuntulinux-image-2.6.31-611-imx51 (2.6.31-611.29) @ lucid2026-05-29ubuntu
ubuntulinux-image-2.6.32-35-386 (2.6.32-35.78) @ lucid2026-05-29ubuntu
redhatkernel-rt-0:2.6.33.9-rt31.79.el6rt2012-01-10redhat
redhatkernel-0:2.6.32-131.21.1.el62011-11-22redhat
redhatkernel-0:2.6.18-238.28.1.el52011-11-01redhat
redhatkernel-0:2.6.18-274.7.1.el52011-10-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(14)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:23 UTCEPSS rescore
  2. 2026-07-06 02:19 UTCEPSS rescore
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  15. 2026-06-25 13:46 UTCEPSS rescore
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  18. 2026-06-23 21:30 UTCEPSS rescore
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  1. 2026-06-18 17:49 UTCEPSS rescore
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  8. 2026-06-13 22:57 UTCEPSS rescore
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  10. 2026-06-12 23:08 UTCEPSS rescore
  11. 2026-06-11 13:56 UTCEPSS rescore
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  18. 2026-06-06 13:45 UTCEPSS rescore
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  25. 2026-06-02 20:10 UTCEPSS rescore
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  27. 2026-06-01 13:49 UTCEPSS rescore
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  29. 2026-05-31 22:28 UTCEPSS rescore
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  35. 2026-05-29 04:29 UTCEG score recompute
  36. 2026-05-29 04:29 UTCVendor advisory
  37. 2026-05-29 04:29 UTCGHSA enrichment
  38. 2026-05-28 13:42 UTCEPSS rescore
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  41. 2026-05-27 13:38 UTCEPSS rescore
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  45. 2026-05-26 07:16 UTCEPSS rescore
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  47. 2026-05-24 16:43 UTCEPSS rescore
  48. 2026-05-22 21:15 UTCEPSS rescore
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  57. 2026-05-18 21:29 UTCEPSS rescore
  58. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(5)

What is CVE-2011-3188?
CVE-2011-3188 is a critical vulnerability published on May 24, 2012. 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…
When was CVE-2011-3188 disclosed?
CVE-2011-3188 was first published in the National Vulnerability Database on May 24, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-3188 actively exploited?
CVE-2011-3188 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2011-3188?
CVE-2011-3188 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2011-3188?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-3188, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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