CVE-2019-11477

HIGHNVD 7.59.0▲
EchelonGraph scoreMEDIUM confidence

Score elevated to 9.0 because EPSS predicts 99% probability of exploitation within the next 30 days (top 0.1% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Trending — 5 sources updated this weekElevated
7.5
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 99%
CISA-KEV: Not listedEPSS: 99%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit 3b4929f65b0d8249f19a50245cd88ed1a2f78cff.

CVSS v3
7.5
EG Score
9.0(medium)
EG Risk
84(Track)
EG Risk 84/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation99% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
99.9%
KEV
Not listed

Published

June 19, 2019

Last Modified

November 21, 2024

References (58)

Patch Availability(17)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-virtual-lts-xenial (4.4.0.151.133) @ trusty2026-05-27ubuntu
ubuntulinux-image-virtual-hwe-18.04 (4.18.0.22.72) @ bionic2026-05-27ubuntu
redhatredhat-virtualization-host-0:4.3.4-20190620.3.el7_62019-07-08redhat
redhatredhat-virtualization-host-0:4.2-20190618.0.el7_62019-06-25redhat
redhatkernel-alt-0:4.14.0-115.8.2.el7a2019-06-25redhat
redhatkernel-0:2.6.32-754.15.3.el62019-06-17redhat
redhatkernel-rt-0:4.18.0-80.4.2.rt9.152.el8_02019-06-17redhat
redhatkernel-0:2.6.32-431.95.3.el62019-06-17redhat
redhatkernel-rt-0:3.10.0-957.21.3.rt56.935.el72019-06-17redhat
redhatkernel-0:3.10.0-957.21.3.el72019-06-17redhat
redhatkernel-0:3.10.0-862.34.2.el72019-06-17redhat
redhatkernel-rt-1:3.10.0-693.50.3.rt56.644.el6rt2019-06-17redhat
redhatkernel-0:3.10.0-327.79.2.el72019-06-17redhat
redhatkernel-0:3.10.0-693.50.3.el72019-06-17redhat
redhatkernel-0:2.6.32-504.79.3.el62019-06-17redhat
redhatkernel-0:4.18.0-80.4.2.el8_02019-06-17redhat
redhatkernel-0:3.10.0-514.66.2.el72019-06-17redhat

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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(17)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 10× 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. 2026-07-24 14:14 UTCEPSS rescore
  2. 2026-07-24 14:14 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:39 UTCEG score recompute
  5. 2026-07-22 21:29 UTCEG score recompute▲ 1.50
  6. 2026-07-22 21:29 UTCVendor advisory
  7. 2026-07-22 21:29 UTCGHSA enrichment
  8. 2026-07-20 14:34 UTCOSV refresh
  9. 2026-07-06 02:20 UTCEPSS rescore
  10. 2026-07-03 09:56 UTCOSV refresh
  11. 2026-06-25 13:47 UTCEPSS rescore
  12. 2026-06-25 13:47 UTCEPSS rescore
  13. 2026-06-24 14:03 UTCEPSS rescore
  14. 2026-06-24 14:02 UTCEPSS rescore
  15. 2026-06-15 17:45 UTCEPSS rescore
  16. 2026-06-15 00:13 UTCOSV refresh
  17. 2026-06-14 23:15 UTCEPSS rescore
  18. 2026-06-14 23:15 UTCEPSS rescore
  19. 2026-06-13 22:58 UTCEPSS rescore
  20. 2026-06-12 23:09 UTCEPSS rescore
  21. 2026-06-11 13:58 UTCEPSS rescore
  22. 2026-06-11 13:58 UTCEPSS rescore
  23. 2026-06-10 22:16 UTCEPSS rescore
  24. 2026-06-10 13:19 UTCEPSS rescore
  25. 2026-06-08 14:15 UTCEPSS rescore
Show 19 more
  1. 2026-06-08 14:14 UTCEPSS rescore
  2. 2026-06-05 22:45 UTCEPSS rescore
  3. 2026-06-05 22:45 UTCEPSS rescore
  4. 2026-06-05 06:08 UTCEPSS rescore
  5. 2026-06-05 06:08 UTCEPSS rescore
  6. 2026-06-04 13:10 UTCEPSS rescore
  7. 2026-06-04 13:10 UTCEPSS rescore
  8. 2026-06-02 20:11 UTCEPSS rescore
  9. 2026-06-01 13:50 UTCEPSS rescore
  10. 2026-06-01 13:50 UTCEPSS rescore
  11. 2026-05-31 00:14 UTCEPSS rescore
  12. 2026-05-31 00:14 UTCEPSS rescore
  13. 2026-05-29 13:42 UTCEPSS rescore
  14. 2026-05-27 18:14 UTCEG score recompute
  15. 2026-05-27 18:14 UTCVendor advisory
  16. 2026-05-27 18:14 UTCGHSA enrichment
  17. 2026-05-27 13:38 UTCEPSS rescore
  18. 2026-05-26 07:17 UTCEPSS rescore
  19. 2026-05-26 07:17 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCsasqwatch/cve-2019-11477-poc
    First seen Jul 22, 2019
    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-11477?
CVE-2019-11477 is a high vulnerability published on June 19, 2019. Jonathan Looney discovered that the TCPSKBCB(skb)->tcpgsosegs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs). A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182,…
When was CVE-2019-11477 disclosed?
CVE-2019-11477 was first published in the National Vulnerability Database on June 19, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-11477 actively exploited?
CVE-2019-11477 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-11477?
CVE-2019-11477 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
How do I remediate CVE-2019-11477?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11477, 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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