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CVE-2019-11477· NVD / CVE Program· CNA canonical

Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs

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.

HighCVSS 7.5 · v3.1—Proof of concept Fix available
Published
Jun 18, 2019
Updated
Jun 16, 2026
EPSS
98.7% · 100th percentile
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JSON

Action score

60

This week

Don’t wait for the next maintenance window.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
30 / 30 · 98.7%

CNA vs NVD score

NVD
7.5
CNA · canonical
7.5
agree

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
linuxlinux kernel
f5big-ip advanced firewall manager
f5big-ip access policy manager
f5big-ip application acceleration manager
f5big-ip link controller
f5big-ip policy enforcement manager
f5big-ip webaccelerator
f5big-ip application security manager
f5big-ip local traffic manager
f5big-ip fraud protection service
f5big-ip global traffic manager
f5big-ip analytics

and 12 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • ivanti connect secureall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (canonical). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux kernel

    • 4.4 and later · before 4.4.182affected
    • 4.9 and later · before 4.9.182affected
    • 4.14 and later · before 4.14.127affected
    • 4.19 and later · before 4.19.52affected
    • 5.1 and later · before 5.1.11affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 4.19.37-44.19.37-4
Debian:8linuxbefore 3.16.68-23.16.68-2
Debian:8linux-4.9before 4.9.168-1+deb9u3~deb8u14.9.168-1+deb9u3~deb8u1
Debian:9linuxbefore 4.9.168-1+deb9u34.9.168-1+deb9u3
openSUSE:Leap 15.0kernel-debugbefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-defaultbefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-docsbefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-kvmsmallbefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-obs-buildbefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-obs-qabefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-sourcebefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-symsbefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.0kernel-vanillabefore 4.12.14-lp150.12.64.14.12.14-lp150.12.64.1
openSUSE:Leap 15.1kernel-debugbefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-defaultbefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-docsbefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-kvmsmallbefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-obs-buildbefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-obs-qabefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-sourcebefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-symsbefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
openSUSE:Leap 15.1kernel-vanillabefore 4.12.14-lp151.28.7.14.12.14-lp151.28.7.1
Red Hat:enterprise_linux:6::clientkernelbefore 0:2.6.32-754.15.3.el60:2.6.32-754.15.3.el6
Red Hat:enterprise_linux:6::clientkernel-abi-whitelistsbefore 0:2.6.32-754.15.3.el60:2.6.32-754.15.3.el6

+96

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    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now
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    77This week
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    77This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Debian:linux4.19.37-4 · Debian:12Package registry (OSV)
Debian:linux-4.94.9.168-1+deb9u3~deb8u1 · Debian:8Package registry (OSV)
openSUSE:kernel-debug4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-default4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-docs4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-kvmsmall4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-obs-build4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-obs-qa4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-source4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-syms4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
openSUSE:kernel-vanilla4.12.14-lp151.28.7.1 · openSUSE:Leap 15.1Package registry (OSV)
Red Hat:bpftool0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:bpftool-debuginfo0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-abi-whitelists0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-core0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-debug0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-debug-core0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-debug-debuginfo0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-debug-devel0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-debug-modules0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-debug-modules-extra0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
Red Hat:kernel-debuginfo0:4.18.0-80.4.2.el8_0 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
SUSE:kernel-azure4.4.180-4.31.1 · SUSE:Linux Enterprise Server 12 SP3Package registry (OSV)
SUSE:kernel-bigmem3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)
SUSE:kernel-default3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)
SUSE:kernel-ec23.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)
SUSE:kernel-pae3.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)
SUSE:kernel-ppc643.0.101-108.95.2 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)
SUSE:kernel-source3.0.101-108.95.1 · SUSE:Linux Enterprise Server 11 SP4-LTSSPackage registry (OSV)

+5

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:82019-07-22

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoC+33 d
  3. TodaySep 29, 2026+2660 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

All records