CVE-2019-11479: High severity Linux Linux kernel vulnerability

Published Jun 11, 2019
·
Updated

An excessive resource consumption flaw was found in the way the Linux kernel's networking subsystem processed TCP segments. If the Maximum Segment Size (MSS) of a TCP connection was set to low values, such as 48 bytes, it can leave as little as 8 bytes for the user data, which significantly increases the Linux kernel's resource (CPU, Memory, and Bandwidth) utilization. A remote attacker could use this flaw to cause a denial of service (DoS) by repeatedly sending network traffic on a TCP connection with low TCP MSS.

Other sources

An excessive resource consumption issue was found in the way Linux kernel processes TCP segments. If Maximum Segment Size(MSS) of a TCP connection was set to its lowest value of 48 bytes, it leaves merely 8 bytes for the user data. It significantly increases Linux kernel's resource (CPU/Memory/Bandwidth etc.) utilisation leading to a DoS like scenario.

A remote attacker could use this flaw to cause DoS by repeatedly sending network traffic on a TCP connection with lowest value for TCP MSS.

Upstream patch: --------------- -> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=967c05aee439e6e5d7d805e195b3a20ef5c433d6

— Red Hat

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. 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 commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.

Affected Software

189 affected componentsFixes available
redhat/kernel<0:2.6.32-754.15.3.el6
0:2.6.32-754.15.3.el6
redhat/kernel<0:2.6.32-431.95.3.el6
0:2.6.32-431.95.3.el6
redhat/kernel<0:2.6.32-504.79.3.el6
0:2.6.32-504.79.3.el6
redhat/kernel-rt<0:3.10.0-957.21.3.rt56.935.el7
0:3.10.0-957.21.3.rt56.935.el7
redhat/kernel<0:3.10.0-957.21.3.el7
0:3.10.0-957.21.3.el7
redhat/kernel-alt<0:4.14.0-115.8.2.el7a
0:4.14.0-115.8.2.el7a
redhat/kernel<0:3.10.0-327.79.2.el7
0:3.10.0-327.79.2.el7
redhat/kernel<0:3.10.0-514.66.2.el7
0:3.10.0-514.66.2.el7
redhat/kernel<0:3.10.0-693.50.3.el7
0:3.10.0-693.50.3.el7
redhat/kernel<0:3.10.0-862.34.2.el7
0:3.10.0-862.34.2.el7
redhat/kernel-rt<0:4.18.0-80.4.2.rt9.152.el8_0
0:4.18.0-80.4.2.rt9.152.el8_0
redhat/kernel<0:4.18.0-80.4.2.el8_0
0:4.18.0-80.4.2.el8_0
redhat/kernel-rt<1:3.10.0-693.50.3.rt56.644.el6
1:3.10.0-693.50.3.rt56.644.el6
redhat/redhat-release-virtualization-host<0:4.2-11.1.el7
0:4.2-11.1.el7
redhat/redhat-virtualization-host<0:4.2-20190618.0.el7_6
0:4.2-20190618.0.el7_6
redhat/redhat-release-virtualization-host<0:4.3.4-1.el7e
0:4.3.4-1.el7e
redhat/redhat-virtualization-host<0:4.3.4-20190620.3.el7_6
0:4.3.4-20190620.3.el7_6
Linux Linux kernel>=4.4<4.4.182
Linux Linux kernel>=4.9<4.9.182
Linux Linux kernel>=4.14<4.14.127
Linux Linux kernel>=4.19<4.19.52
Linux Linux kernel>=5.1<5.1.11
F5 BIG-IP Advanced Firewall Manager>=11.5.2<11.6.5.1
F5 BIG-IP Advanced Firewall Manager>=12.1.0<12.1.5.1
F5 BIG-IP Advanced Firewall Manager>=13.1.0<13.1.3.2
F5 BIG-IP Advanced Firewall Manager>=14.0.0<14.0.1.1
F5 BIG-IP Advanced Firewall Manager>=14.1.2<14.1.2.1
F5 BIG-IP Advanced Firewall Manager>=15.0.0<15.0.1.1
F5 BIG-IP Access Policy Manager>=11.5.2<11.6.5.1
F5 BIG-IP Access Policy Manager>=12.1.0<12.1.5.1
F5 BIG-IP Access Policy Manager>=13.1.0<13.1.3.2
F5 BIG-IP Access Policy Manager>=14.0.0<14.0.1.1
F5 BIG-IP Access Policy Manager>=14.1.2<14.1.2.1
F5 BIG-IP Access Policy Manager>=15.0.0<15.0.1.1
F5 Big-ip Application Acceleration Manager>=11.5.2<11.6.5.1
F5 Big-ip Application Acceleration Manager>=12.1.0<12.1.5.1
F5 Big-ip Application Acceleration Manager>=13.1.0<13.1.3.2
F5 Big-ip Application Acceleration Manager>=14.0.0<14.0.1.1
F5 Big-ip Application Acceleration Manager>=14.1.2<14.1.2.1
F5 Big-ip Application Acceleration Manager>=15.0.0<15.0.1.1
F5 Big-ip Link Controller>=11.5.2<11.6.5.1
F5 Big-ip Link Controller>=12.1.0<12.1.5.1
F5 Big-ip Link Controller>=13.1.0<13.1.3.2
F5 Big-ip Link Controller>=14.0.0<14.0.1.1
F5 Big-ip Link Controller>=14.1.2<14.1.2.1
F5 Big-ip Link Controller>=15.0.0<15.0.1.1
F5 Big-ip Policy Enforcement Manager>=11.5.2<11.6.5.1
F5 Big-ip Policy Enforcement Manager>=12.1.0<12.1.5.1
F5 Big-ip Policy Enforcement Manager>=13.1.0<13.1.3.2
F5 Big-ip Policy Enforcement Manager>=14.0.0<14.0.1.1
F5 Big-ip Policy Enforcement Manager>=14.1.2<14.1.2.1
F5 Big-ip Policy Enforcement Manager>=15.0.0<15.0.1.1
F5 Big-ip Webaccelerator>=11.5.2<11.6.5.1
F5 Big-ip Webaccelerator>=12.1.0<12.1.5.1
F5 Big-ip Webaccelerator>=13.1.0<13.1.3.2
F5 Big-ip Webaccelerator>=14.0.0<14.0.1.1
F5 Big-ip Webaccelerator>=14.1.2<14.1.2.1
F5 Big-ip Webaccelerator>=15.0.0<15.0.1.1
F5 BIG-IP Application Security Manager>=11.5.2<11.6.5.1
F5 BIG-IP Application Security Manager>=12.1.0<12.1.5.1
F5 BIG-IP Application Security Manager>=13.1.0<13.1.3.2
F5 BIG-IP Application Security Manager>=14.0.0<14.0.1.1
F5 BIG-IP Application Security Manager>=14.1.2<14.1.2.1
F5 BIG-IP Application Security Manager>=15.0.0<15.0.1.1
F5 Big-ip Local Traffic Manager>=11.5.2<11.6.5.1
F5 Big-ip Local Traffic Manager>=12.1.0<12.1.5.1
F5 Big-ip Local Traffic Manager>=13.1.0<13.1.3.2
F5 Big-ip Local Traffic Manager>=14.0.0<14.0.1.1
F5 Big-ip Local Traffic Manager>=14.1.2<14.1.2.1
F5 Big-ip Local Traffic Manager>=15.0.0<15.0.1.1
F5 Big-ip Fraud Protection Service>=11.5.2<11.6.5.1
F5 Big-ip Fraud Protection Service>=12.1.0<12.1.5.1
F5 Big-ip Fraud Protection Service>=13.1.0<13.1.3.2
F5 Big-ip Fraud Protection Service>=14.0.0<14.0.1.1
F5 Big-ip Fraud Protection Service>=14.1.2<14.1.2.1
F5 Big-ip Fraud Protection Service>=15.0.0<15.0.1.1
F5 Big-ip Global Traffic Manager>=11.5.2<11.6.5.1
F5 Big-ip Global Traffic Manager>=12.1.0<12.1.5.1
F5 Big-ip Global Traffic Manager>=13.1.0<13.1.3.2
F5 Big-ip Global Traffic Manager>=14.0.0<14.0.1.1
F5 Big-ip Global Traffic Manager>=14.1.2<14.1.2.1
F5 Big-ip Global Traffic Manager>=15.0.0<15.0.1.1
F5 BIG-IP Analytics>=11.5.2<11.6.5.1
F5 BIG-IP Analytics>=12.1.0<12.1.5.1
F5 BIG-IP Analytics>=13.1.0<13.1.3.2
F5 BIG-IP Analytics>=14.0.0<14.0.1.1
F5 BIG-IP Analytics>=14.1.2<14.1.2.1
F5 BIG-IP Analytics>=15.0.0<15.0.1.1
F5 BIG-IP Edge Gateway>=11.5.2<11.6.5.1
F5 BIG-IP Edge Gateway>=12.1.0<12.1.5.1
F5 BIG-IP Edge Gateway>=13.1.0<13.1.3.2
F5 BIG-IP Edge Gateway>=14.0.0<14.0.1.1
F5 BIG-IP Edge Gateway>=14.1.2<14.1.2.1
F5 BIG-IP Edge Gateway>=15.0.0<15.0.1.1
F5 Big-ip Domain Name System>=11.5.2<11.6.5.1
F5 Big-ip Domain Name System>=12.1.0<12.1.5.1
F5 Big-ip Domain Name System>=13.1.0<13.1.3.2
F5 Big-ip Domain Name System>=14.0.0<14.0.1.1
F5 Big-ip Domain Name System>=14.1.2<14.1.2.1
F5 Big-ip Domain Name System>=15.0.0<15.0.1.1
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=18.10
Canonical Ubuntu Linux=19.04
redhat Enterprise Linux=7.0
F5 BIG-IQ Centralized Management>=5.1.0<=5.4.0
F5 BIG-IQ Centralized Management>=6.0.0<=6.1.0
F5 Enterprise Manager=3.1.1
F5 iWorkflow=2.3.0
F5 Traffix Signaling Delivery Controller>=5.0.0<=5.1.0
redhat Virtualization Host=4.0
redhat Enterprise Linux=7.0
Siemens CloudConnect 712<1.1.5
1.1.5
Siemens ROX II<2.13.3
2.13.3
Siemens RUGGEDCOM APE 1404 Linux: All versions prior to Debian 9 Linux Image 2019-12-13
Siemens RUGGEDCOM RM1224 (6GK6108-4AM00)<6.2
6.2
Siemens RUGGEDCOM RX 1400 VPE Debian Linux: All versions prior to Debian 9 Linux Image 2019-12-13
Siemens RUGGEDCOM RX 1400 VPE Linux CloudConnect: All versions prior to Debian 9 Linux Image 2019-12-13 13 (only affected by CVE-2019-11479)
Siemens SCALANCE M804PB (6GK5804-0AP00-2AA2)<6.2
6.2
Siemens SCALANCE M812-1 ADSL-Router (Annex A) (6GK5812-1AA00-2AA2)<6.2
6.2
Siemens SCALANCE M812-1 ADSL-Router (Annex B) (6GK5812-1BA00-2AA2)<6.2
6.2
Siemens SCALANCE M816-1 ADSL-Router (Annex A) (6GK5816-1AA00-2AA2)<6.2
6.2
Siemens SCALANCE M816-1 ADSL-Router (Annex B) (6GK5816-1BA00-2AA2)<6.2
6.2
Siemens SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2)<6.2
6.2
Siemens SCALANCE M874-2 (6GK5874-2AA00-2AA2)<6.2
6.2
Siemens SCALANCE M874-3 (6GK5874-3AA00-2AA2)<6.2
6.2
Siemens SCALANCE M875
Siemens SCALANCE M876-3 (6GK5876-3AA02-2BA2)<6.2
6.2
Siemens SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2)<6.2
6.2
Siemens SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2)<6.2
6.2
Siemens SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2)<6.2
6.2
Siemens SCALANCE S602<4.1
4.1
Siemens SCALANCE S612<4.1
4.1
Siemens SCALANCE S615 (6GK5615-0AA00-2AA2)<6.2
6.2
Siemens SCALANCE S623<4.1
4.1
Siemens SCALANCE S627-2M<4.1
4.1
Siemens SCALANCE SC622-2C (6GK5622-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC632-2C (6GK5632-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC636-2C (6GK5636-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC642-2C (6GK5642-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE SC646-2C (6GK5646-2GS00-2AC2)<2.0.1
2.0.1
Siemens SCALANCE W1750D<8.6.0
8.6.0
Siemens SCALANCE W-700 IEEE 802.11n family<6.4
6.4
Siemens SCALANCE W-1700 IEEE 802.11ac family<2.0
2.0
Siemens SCALANCE WLC711
Siemens SCALANCE WLC712
Siemens SIMATIC CM 1542-1<3.0
3.0
Siemens SIMATIC CP 343-1 Advanced (incl. SIPLUS variants)
All of the following
redhat Virtualization Host=4.0
redhat Enterprise Linux=7.0
ubuntu/linux-aws<4.4.0-1054.58
4.4.0-1054.58
ubuntu/linux-azure<4.15.0-1059.64~14.04.1
4.15.0-1059.64~14.04.1
ubuntu/linux-lts-xenial<4.4.0-164.192~14.04.1
4.4.0-164.192~14.04.1
ubuntu/linux*
ubuntu/linux<4.4.0-154.181
4.4.0-154.181
ubuntu/linux-aws<4.4.0-1087.98
4.4.0-1087.98
ubuntu/linux-aws-hwe<4.15.0-1043.45~16.04.1
4.15.0-1043.45~16.04.1
ubuntu/linux-azure<4.15.0-1049.54
4.15.0-1049.54
ubuntu/linux-gcp<4.15.0-1036.38~16.04.1
4.15.0-1036.38~16.04.1
ubuntu/linux-hwe<4.15.0-54.58~16.04.1
4.15.0-54.58~16.04.1
ubuntu/linux-kvm<4.4.0-1051.58
4.4.0-1051.58
ubuntu/linux-oracle<4.15.0-1017.19~16.04.2
4.15.0-1017.19~16.04.2
ubuntu/linux-raspi2<4.4.0-1114.123
4.4.0-1114.123
ubuntu/linux-snapdragon<4.4.0-1118.124
4.4.0-1118.124
ubuntu/linux-fips<4.4.0-1013.17
4.4.0-1013.17
ubuntu/linux<4.15.0-54.58
4.15.0-54.58
ubuntu/linux-aws<4.15.0-1043.45
4.15.0-1043.45
ubuntu/linux-azure<4.18.0-1023.24~18.04.1
4.18.0-1023.24~18.04.1
ubuntu/linux-gcp<4.15.0-1036.38
4.15.0-1036.38
ubuntu/linux-gcp-edge<4.18.0-1015.16~18.04.1
4.18.0-1015.16~18.04.1
ubuntu/linux-gke-4.15<4.15.0-1036.38
4.15.0-1036.38
ubuntu/linux-hwe<4.18.0-25.26~18.04.1
4.18.0-25.26~18.04.1
ubuntu/linux-hwe-edge<5.0.0-20.21~18.04.1
5.0.0-20.21~18.04.1
ubuntu/linux-kvm<4.15.0-1038.38
4.15.0-1038.38
ubuntu/linux-oem<4.15.0-1045.50
4.15.0-1045.50
ubuntu/linux-oracle<4.15.0-1017.19
4.15.0-1017.19
ubuntu/linux-raspi2<4.15.0-1040.43
4.15.0-1040.43
ubuntu/linux-snapdragon<4.15.0-1057.62
4.15.0-1057.62
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.15*
ubuntu/linux-gke*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-raspi-realtime*
debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.15-17.3.3-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-754.15.3.el6
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-431.95.3.el6
  3. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:2.6.32-504.79.3.el6
  4. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.21.3.rt56.935.el7
  5. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.21.3.el7
  6. Upgrade

    Upgrade redhat/kernel-alt to a version that resolves this vulnerability.

    Fixed in 0:4.14.0-115.8.2.el7a
  7. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-327.79.2.el7
  8. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-514.66.2.el7
  9. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-693.50.3.el7
  10. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-862.34.2.el7
  11. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-80.4.2.rt9.152.el8_0
  12. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-80.4.2.el8_0
  13. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 1:3.10.0-693.50.3.rt56.644.el6
  14. Upgrade

    Upgrade redhat/redhat-release-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.2-11.1.el7
  15. Upgrade

    Upgrade redhat/redhat-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.2-20190618.0.el7_6
  16. Upgrade

    Upgrade redhat/redhat-release-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.3.4-1.el7e
  17. Upgrade

    Upgrade redhat/redhat-virtualization-host to a version that resolves this vulnerability.

    Fixed in 0:4.3.4-20190620.3.el7_6
  18. Upgrade

    Upgrade Siemens Simatic Cloud Connect 7 CC712 to a version that resolves this vulnerability.

    Fixed in 1.1.5
  19. Upgrade

    Upgrade Siemens ROX to a version that resolves this vulnerability.

    Fixed in 2.13.3
  20. Upgrade

    Upgrade Siemens RUGGEDCOM RM1224 to a version that resolves this vulnerability.

    Fixed in 6.2
  21. Upgrade

    Upgrade Siemens SCALANCE M804PB to a version that resolves this vulnerability.

    Fixed in 6.2
  22. Upgrade

    Upgrade Siemens Scalance M812-1 ADSL Router to a version that resolves this vulnerability.

    Fixed in 6.2
  23. Upgrade

    Upgrade Siemens Scalance M816-1 ADSL-Router Firmware to a version that resolves this vulnerability.

    Fixed in 6.2
  24. Upgrade

    Upgrade Siemens SCALANCE M826-2 SHDSL-Router to a version that resolves this vulnerability.

    Fixed in 6.2
  25. Upgrade

    Upgrade Siemens SCALANCE M874-2 to a version that resolves this vulnerability.

    Fixed in 6.2
  26. Upgrade

    Upgrade Siemens SCALANCE M874-3 to a version that resolves this vulnerability.

    Fixed in 6.2
  27. Upgrade

    Upgrade Siemens SCALANCE M876-3 to a version that resolves this vulnerability.

    Fixed in 6.2
  28. Upgrade

    Upgrade Siemens SCALANCE M876-4 to a version that resolves this vulnerability.

    Fixed in 6.2
  29. Upgrade

    Upgrade Siemens Scalance S602 Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  30. Upgrade

    Upgrade Siemens Scalance S612 Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  31. Upgrade

    Upgrade Siemens SCALANCE S615 to a version that resolves this vulnerability.

    Fixed in 6.2
  32. Upgrade

    Upgrade Siemens Scalance S623 Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  33. Upgrade

    Upgrade Siemens Scalance S627-2M Firmware to a version that resolves this vulnerability.

    Fixed in 4.1
  34. Upgrade

    Upgrade Siemens SCALANCE SC622-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  35. Upgrade

    Upgrade Siemens SCALANCE SC632-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  36. Upgrade

    Upgrade Siemens SCALANCE SC636-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  37. Upgrade

    Upgrade Siemens SCALANCE SC642-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  38. Upgrade

    Upgrade Siemens SCALANCE SC646-2C to a version that resolves this vulnerability.

    Fixed in 2.0.1
  39. Upgrade

    Upgrade Siemens Scalance W1750D Firmware to a version that resolves this vulnerability.

    Fixed in 8.6.0
  40. Upgrade

    Upgrade Siemens SCALANCE W-700 to a version that resolves this vulnerability.

    Fixed in 6.4
  41. Upgrade

    Upgrade Siemens SCALANCE W1700 IEEE 802.11ac to a version that resolves this vulnerability.

    Fixed in 2.0
  42. Upgrade

    Upgrade Siemens SIMATIC CM 1542-1 Firmware to a version that resolves this vulnerability.

    Fixed in 3.0
  43. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1054.58
  44. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1059.64~14.04.1
  45. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-164.192~14.04.1
  46. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-154.181
  47. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1087.98
  48. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1043.45~16.04.1
  49. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.15.0-1049.54
  50. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1036.38~16.04.1
  51. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-54.58~16.04.1
  52. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1051.58
  53. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1017.19~16.04.2
  54. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1114.123
  55. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.4.0-1118.124
  56. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.4.0-1013.17
  57. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-54.58
  58. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1043.45
  59. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.18.0-1023.24~18.04.1
  60. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1036.38
  61. Upgrade

    Upgrade ubuntu/linux-gcp-edge to a version that resolves this vulnerability.

    Fixed in 4.18.0-1015.16~18.04.1
  62. Upgrade

    Upgrade ubuntu/linux-gke-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1036.38
  63. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.18.0-25.26~18.04.1
  64. Upgrade

    Upgrade ubuntu/linux-hwe-edge to a version that resolves this vulnerability.

    Fixed in 5.0.0-20.21~18.04.1
  65. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1038.38
  66. Upgrade

    Upgrade ubuntu/linux-oem to a version that resolves this vulnerability.

    Fixed in 4.15.0-1045.50
  67. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1017.19
  68. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1040.43
  69. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.15.0-1057.62
  70. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.15-1Fixed in 7.3.3-1
  71. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 4.4.182
  72. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 4.9.182
  73. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 4.14.127
  74. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 4.19.52
  75. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 5.1.11
  76. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Patch 967c05aee439e6e5d7d805e195b3a20ef5c433d6
  77. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Patch 5f3e2bf008c2221478101ee72f5cb4654b9fc363
  78. Configuration

    Disable the net.ipv4.tcp_mtu_probing sysctl.

    Linux kernel networking net.ipv4.tcp_mtu_probing = disabled
  79. Compensating control

    Drop TCP packets specifying an MSS from 1 through 500 with: sudo iptables -A INPUT -p tcp -m tcpmss --mss 1:500 -j DROP

Event History

Jun 11, 2019
Data Sourced
via Red Hat·06:45 AM
DescriptionSeverityAffected Software
Jun 17, 2019
CVE Published
via OSV·05:00 PM
Data Sourced
via OSV·05:00 PM
DescriptionSeverityAffected Software
Jun 18, 2019
CVE Published
via MITRE·11:34 PM
Data Sourced
via MITRE·11:34 PM
DescriptionSeverityWeakness
Jun 19, 2019
Data Sourced
via NVD·12:15 AM
RemedyDescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2019-11479?

CVE-2019-11479 is classified as a medium severity vulnerability due to the excessive resource consumption that can disrupt legitimate traffic.

2

How do I fix CVE-2019-11479?

To mitigate CVE-2019-11479, update the Linux kernel or affected software to the latest version that includes the required fixes.

3

Which systems are affected by CVE-2019-11479?

CVE-2019-11479 affects various versions of the Linux kernel across multiple distributions, including Red Hat and Ubuntu.

4

Can CVE-2019-11479 lead to a denial of service?

Yes, CVE-2019-11479 can lead to a denial of service by consuming excessive resources that may affect network performance.

5

Is there a patch for CVE-2019-11479?

Yes, patches are available and should be applied to vulnerable systems to address the issues presented by CVE-2019-11479.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203