CVE-2019-11478
MEDIUMCVSS 5.3/10EPSS 94.69%
Last modified
CVE-2019-11478 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 94.69% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.4.182 |
| Linux | Linux Kernel | >= 4.5, < 4.9.182 |
| Linux | Linux Kernel | >= 4.10, < 4.14.127 |
| Linux | Linux Kernel | >= 4.15, < 4.19.52 |
| Linux | Linux Kernel | >= 4.20, < 5.1.11 |
| F5 | Big-Ip Advanced Firewall Manager | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Advanced Firewall Manager | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Advanced Firewall Manager | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Advanced Firewall Manager | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Advanced Firewall Manager | 15.0.0 |
| F5 | Big-Ip Access Policy Manager | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Access Policy Manager | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Access Policy Manager | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Access Policy Manager | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Access Policy Manager | 15.0.0 |
| F5 | Big-Ip Application Acceleration Manager | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Application Acceleration Manager | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Application Acceleration Manager | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Application Acceleration Manager | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Application Acceleration Manager | 15.0.0 |
| F5 | Big-Ip Link Controller | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Link Controller | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Link Controller | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Link Controller | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Link Controller | 15.0.0 |
| F5 | Big-Ip Policy Enforcement Manager | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Policy Enforcement Manager | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Policy Enforcement Manager | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Policy Enforcement Manager | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Policy Enforcement Manager | 15.0.0 |
| F5 | Big-Ip Webaccelerator | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Webaccelerator | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Webaccelerator | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Webaccelerator | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Webaccelerator | 15.0.0 |
| F5 | Big-Ip Application Security Manager | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Application Security Manager | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Application Security Manager | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Application Security Manager | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Application Security Manager | 15.0.0 |
| F5 | Big-Ip Local Traffic Manager | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Local Traffic Manager | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Local Traffic Manager | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Local Traffic Manager | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Local Traffic Manager | 15.0.0 |
| F5 | Big-Ip Fraud Protection Service | >= 11.5.2, <= 11.6.4 |
| F5 | Big-Ip Fraud Protection Service | >= 12.1.0, <= 12.1.4 |
| F5 | Big-Ip Fraud Protection Service | >= 13.1.0, <= 13.1.1 |
| F5 | Big-Ip Fraud Protection Service | >= 14.0.0, <= 14.1.0 |
| F5 | Big-Ip Fraud Protection Service | 15.0.0 |
Showing 50 of 90 affected configurations. See NVD for the full list.
References
- http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.htmlThird Party Advisory, VDB Entry
- https://access.redhat.com/security/vulnerabilities/tcpsackThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2ac66716357066b683fb0baf55f8191a2eMailing List, Patch, Vendor Advisory
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.mdPatch, Third Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193Third Party Advisory
- https://support.f5.com/csp/article/K26618426Third Party Advisory
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanicMitigation, Third Party Advisory
- http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.htmlThird Party Advisory, VDB Entry
- https://access.redhat.com/security/vulnerabilities/tcpsackThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2ac66716357066b683fb0baf55f8191a2eMailing List, Patch, Vendor Advisory
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.mdPatch, Third Party Advisory
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193Third Party Advisory
- https://support.f5.com/csp/article/K26618426Third Party Advisory
- https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanicMitigation, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-11478?
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.
How severe is CVE-2019-11478?
CVE-2019-11478 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 94.69% probability of exploitation in the next 30 days.
How do I fix CVE-2019-11478?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Scan your code nowSource: NVD / NIST