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.
CVE-2011-3188
“—” beside the score: it is equal to NVD's CVSS score.
Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.1; sources differ by 0.0.
Also known asEUVD-2011-3153 (ENISA EUVD) · GHSA-93rr-wh56-p8fw (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 9.1
- EG Score
- 9.1CRITICALmedium confidence
- EG Risk
- 43EG Risk 43/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity91% × 45%Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation5.0% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 5.0%
- EPSS %ILE
- 92nd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 5.0% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
May 24, 2012
Last Modified
April 29, 2026
Advisory Details (7)
Auto-updated Aug 1, 2026commit bc0b96b54a21 (torvalds/linux)
Fix landed in torvalds/linux commit bc0b96b54a21 — awaiting tagged release
https://github.com/torvalds/linux/commit/bc0b96b54a21246e377122d54569eef71cec535fcommit 6e5714eaf77d (torvalds/linux)
Fix landed in torvalds/linux commit 6e5714eaf77d — awaiting tagged release
https://github.com/torvalds/linux/commit/6e5714eaf77d79ae1c8b47e3e040ff5411b717ec732658 – (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=732658oss-security - Re: CVE request: kernel: change in how tcp seq numbers are generated
http://www.openwall.com/lists/oss-security/2011/08/23/2'[security bulletin] HPSBGN02970 rev.1 - HP Rapid Deployment Pack (RDP) or HP Insight Control Server ' - MARC
http://marc.info/?l=bugtraq&m=139447903326211&w=2Vendor 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)
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.
Affected Packages
(2 across 2 ecosystems)
Debian:5.0(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| linux-2.6 | 2.6.26-13 ... 2.6.26-26lenny3 (40 versions) |
| — |
Debian:6.0(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| linux-2.6 | 2.6.32-30 ... 2.6.32-35~bpo50+1 (10 versions) |
| — |
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.
- Red HatRHSA-2011:1465MODERATE2011-08-07
RHSA-2011:1465 — Moderate
- Red HatRHSA-2012:0010MODERATE2011-08-07
RHSA-2012:0010 — Moderate
- UbuntuUSN-1220-1MEDIUM
Linux kernel (OMAP4) vulnerabilities
- UbuntuUSN-1228-1MEDIUM
Linux kernel (OMAP4) vulnerabilities
- UbuntuUSN-1236-1MEDIUM
Linux kernel vulnerabilities
- UbuntuUSN-1239-1MEDIUM
Linux kernel (EC2) vulnerabilities
- UbuntuUSN-1240-1MEDIUM
Linux kernel (Marvell DOVE) vulnerabilities
- UbuntuUSN-1241-1MEDIUM
Linux kernel (i.MX51) vulnerabilities
- UbuntuUSN-1242-1MEDIUM
Linux kernel (Maverick backport) vulnerabilities
- UbuntuUSN-1243-1MEDIUM
Linux kernel vulnerabilities
- UbuntuUSN-1245-1MEDIUM
Linux kernel (Marvell DOVE) vulnerabilities
- UbuntuUSN-1246-1MEDIUM
Linux kernel vulnerabilities
- UbuntuUSN-1253-1MEDIUM
Linux kernel vulnerabilities
- UbuntuUSN-1256-1MEDIUM
Linux kernel (Natty backport) vulnerabilities
Data Freshness Timeline
(refreshed 25× in last 7d / 87× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 215 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 115 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-11-01 13:41 UTCEG score recompute
- 2026-11-01 13:41 UTCVendor advisory
- 2026-11-01 13:40 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-31 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-31 11:56 UTCEG score recompute
- 2026-10-31 11:56 UTCVendor advisory
- 2026-10-31 11:56 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-30 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-30 10:12 UTCEG score recompute
- 2026-10-30 10:12 UTCVendor advisory
- 2026-10-30 10:12 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-29 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-29 08:28 UTCEG score recompute
- 2026-10-29 08:28 UTCVendor advisory
- 2026-10-29 08:27 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-28 16:25 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-28 06:40 UTCEG score recompute
- 2026-10-28 06:40 UTCVendor advisory
- 2026-10-28 06:40 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-27 16:25 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-27 04:57 UTCEG score recompute
- 2026-10-27 04:57 UTCVendor advisory
- 2026-10-27 04:57 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-26 16:25 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
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- 2026-10-25 23:04 UTCVendor advisory
- 2026-10-25 23:04 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-25 20:15 UTCEG score recompute
- 2026-10-25 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-24 21:20 UTCEG score recompute
- 2026-10-24 21:20 UTCVendor advisory
- 2026-10-24 21:19 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-24 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-23 19:35 UTCEG score recompute
- 2026-10-23 19:35 UTCVendor advisory
- 2026-10-23 19:35 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-23 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-22 17:45 UTCEG score recompute
- 2026-10-22 17:45 UTCVendor advisory
- 2026-10-22 17:44 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-22 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-21 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-21 15:57 UTCEG score recompute
- 2026-10-21 15:57 UTCVendor advisory
- 2026-10-21 15:57 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-20 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-20 14:13 UTCEG score recompute
- 2026-10-20 14:13 UTCVendor advisory
- 2026-10-20 14:13 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-19 16:25 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-19 12:28 UTCEG score recompute
- 2026-10-19 12:28 UTCVendor advisory
- 2026-10-19 12:27 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-18 16:25 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-18 10:42 UTCEG score recompute
- 2026-10-18 10:42 UTCVendor advisory
- 2026-10-18 10:41 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-17 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-17 08:57 UTCEG score recompute
- 2026-10-17 08:57 UTCVendor advisory
- 2026-10-17 08:57 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-16 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-16 07:11 UTCEG score recompute
- 2026-10-16 07:11 UTCVendor advisory
- 2026-10-16 07:11 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-15 16:25 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-15 05:27 UTCEG score recompute
- 2026-10-15 05:27 UTCVendor advisory
- 2026-10-15 05:27 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-14 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-14 01:08 UTCEG score recompute
- 2026-10-14 01:08 UTCVendor advisory
- 2026-10-14 01:08 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-13 16:26 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-12 21:16 UTCEG score recompute
- 2026-10-12 21:16 UTCVendor advisory
- 2026-10-12 21:15 UTCGHSA enrichmentGHSA-93rr-wh56-p8fw · GitHub severity CRITICAL · GitHub CVSS 9.1
- 2026-10-12 16:27 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-12 01:42 UTCEG score recompute
- 2026-10-11 13:38 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-10 19:54 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-09 20:00 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-08 16:34 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-07 23:38 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-06 15:10 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-05 17:37 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-10-04 23:16 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
- 2026-09-30 14:58 UTCEPSS rescoreEPSS 5.0% · 91st percentile
- 2026-09-29 08:21 UTCEG score recompute
- 2026-09-28 13:44 UTCEPSS rescoreEPSS 5.0% · 91st percentile
- 2026-09-27 13:39 UTCEPSS rescoreEPSS 5.0% · 91st percentile
- 2026-09-26 15:52 UTCEPSS rescoreEPSS 5.1% · 92nd percentile
- 2026-09-24 13:57 UTCEPSS rescoreEPSS 5.1% · 92nd percentile
- 2026-09-16 13:58 UTCEPSS rescoreEPSS 5.0% · 91st percentile
- 2026-09-15 03:04 UTCEPSS rescoreEPSS 5.0% · 91st percentile
- 2026-09-13 16:40 UTCEPSS rescoreEPSS 5.0% · 91st percentile
- 2026-09-12 14:54 UTCEPSS rescoreEPSS 5.0% · 91st percentile
- 2026-09-06 13:41 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-09-04 13:55 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
Related CVEs(same product + same vendor)
Same product
10 shownDebian:5.0:linux-2.6
Same vendor
10 shownredhat:RHSA-2011:1386 · redhat:RHSA-2011:1465 · ubuntu:USN-1220-1
Frequently asked(5)
What is CVE-2011-3188?
When was CVE-2011-3188 made public?
Is CVE-2011-3188 actively exploited?
What is the CVSS score of CVE-2011-3188?
How do I remediate CVE-2011-3188?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2011-3188
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