CVE-2019-11477
A public proof of concept exists; no exploitation attested.
- Published2019-06-19
- WeaknessCWE-190
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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.
Timeline
dates in UTC- 2019-06-1900:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-11477?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-11477?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 12.4 | = 12.04 | no fix published | NVD |
| 14.4 | = 14.04 | no fix published | NVD |
| 16.4 | = 16.04 | no fix published | NVD |
| 18.4 | = 18.04 | no fix published | NVD |
| 18.10 | = 18.10 | no fix published | NVD |
| 19.4 | = 19.04 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.1 | ≥ 4.20, < 5.1.11 | 5.1.11 | NVD |
| 4.x | ≥ 4.15, < 4.19.52 | 4.19.52 | NVD |
| 4.x | ≥ 4.10, < 4.14.127 | 4.14.127 | NVD |
| 4.x | ≥ 4.5, < 4.9.182 | 4.9.182 | NVD |
| 4.4 | ≥ 3.17, < 4.4.182 | 4.4.182 | NVD |
| 3.16 | ≥ 2.6.29, < 3.16.69 | 3.16.69 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 11.x | ≥ 11.5.2, ≤ 11.6.4 | no fix published | NVD |
| 12.1 | ≥ 12.1.0, ≤ 12.1.4 | no fix published | NVD |
| 13.1 | ≥ 13.1.0, ≤ 13.1.1 | no fix published | NVD |
| 14.x | ≥ 14.0.0, ≤ 14.1.0 | no fix published | NVD |
| 15.0 | = 15.0.0 | no fix published | NVD |
21 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- git.kernel.orgPatch · Vendor Advisory
- github.comPatch
- wiki.ubuntu.comMitigation
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- NVDCVSS 3.17.5read 2026-10-23
- CNACVSS 3.07.5read 2026-10-23
- NVDCVSS 2.07.8read 2026-10-23
- CNAweakness (CWE)CWE-190read 2026-10-23
- NVDweakness (CWE)CWE-190read 2026-10-23
- FIRST EPSSEPSS score98.7 %read 2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2019-06-19
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2019-11477?
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What is the CVSS score for CVE-2019-11477?
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