HOME VULNERABILITIESCVE-2019-11478

MEDIUM

CVE-2019-11478

CWE-770Published: June 19, 2019· Updated: Jun 17, 2026

5.3

CVSS v3.1

Official Description

Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. 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 f070ef2ac66716357066b683fb0baf55f8191a2e.

Technical Analysis

CVE-2019-11478 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Affected Vendors & Products

Canonical1 product(s)

ubuntu linux

f514 product(s)

big-ip advanced firewall managerbig-ip access policy managerbig-ip application acceleration managerbig-ip link controllerbig-ip policy enforcement managerbig-ip webacceleratorbig-ip application security managerbig-ip local traffic managerbig-ip fraud protection servicebig-ip global traffic managerbig-ip analyticsbig-ip edge gateway+2

ivanti1 product(s)

connect secure

Linux1 product(s)

linux kernel

pulsesecure2 product(s)

pulse policy securepulse secure virtual application delivery controller

Red Hat5 product(s)

enterprise linux atomic hostenterprise linuxenterprise linux ausenterprise linux eusenterprise mrg

Source: NVD CPE · 47 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2ac66716357066b683fb0baf55f8191a2e

PATCHhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md

PATCHhttps://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2ac66716357066b683fb0baf55f8191a2e

PATCHhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md

ADVISORYhttp://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html

ADVISORYhttps://access.redhat.com/security/vulnerabilities/tcpsack

ADVISORYhttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193

ADVISORYhttps://support.f5.com/csp/article/K26618426

ADVISORYhttps://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic

ADVISORYhttp://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html

ADVISORYhttps://access.redhat.com/security/vulnerabilities/tcpsack

ADVISORYhttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193

ADVISORYhttps://support.f5.com/csp/article/K26618426

ADVISORYhttps://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic

All References (58)

→

http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.htmlThird Party Advisory · VDB Entry

→

http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html

→

http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html

→

http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt

→

http://www.openwall.com/lists/oss-security/2019/06/28/2

→

http://www.openwall.com/lists/oss-security/2019/07/06/3

→

http://www.openwall.com/lists/oss-security/2019/07/06/4

→

http://www.openwall.com/lists/oss-security/2019/10/24/1

→

http://www.openwall.com/lists/oss-security/2019/10/29/3

→

http://www.vmware.com/security/advisories/VMSA-2019-0010.html

→

https://access.redhat.com/errata/RHSA-2019:1594

→

https://access.redhat.com/errata/RHSA-2019:1602

→

https://access.redhat.com/errata/RHSA-2019:1699

→

https://access.redhat.com/security/vulnerabilities/tcpsackThird Party Advisory

→

https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf

Quick Facts

CVE IDCVE-2019-11478

CVSS Score5.3 / 10

SeverityMEDIUM

WeaknessCWE-770

CISA KEVNo

Affected6 vendor(s)

PublishedJun 19, 2019

Related CVEs (CWE-770)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2019-11478 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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