USN-4017-1: Linux kernel vulnerabilities

Releases

• Ubuntu 19.04
• Ubuntu 18.10
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-hwe - Linux hardware enablement (HWE) kernel
• linux-kvm - Linux kernel for cloud environments
• linux-oem - Linux kernel for OEM processors
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

Jonathan Looney discovered that the TCP retransmission queue implementation
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. (CVE-2019-11478)

Jonathan Looney discovered that an integer overflow existed in the Linux
kernel when handling TCP Selective Acknowledgments (SACKs). A remote
attacker could use this to cause a denial of service (system crash).
(CVE-2019-11477)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.04

• linux-image-5.0.0-1008-aws - 5.0.0-1008.8
• linux-image-5.0.0-1008-gcp - 5.0.0-1008.8
• linux-image-5.0.0-1008-kvm - 5.0.0-1008.8
• linux-image-5.0.0-1010-raspi2 - 5.0.0-1010.10
• linux-image-5.0.0-1014-snapdragon - 5.0.0-1014.14
• linux-image-5.0.0-17-generic - 5.0.0-17.18
• linux-image-5.0.0-17-generic-lpae - 5.0.0-17.18
• linux-image-5.0.0-17-lowlatency - 5.0.0-17.18
• linux-image-aws - 5.0.0.1008.8
• linux-image-gcp - 5.0.0.1008.8
• linux-image-generic - 5.0.0.17.18
• linux-image-generic-lpae - 5.0.0.17.18
• linux-image-gke - 5.0.0.1008.8
• linux-image-kvm - 5.0.0.1008.8
• linux-image-lowlatency - 5.0.0.17.18
• linux-image-raspi2 - 5.0.0.1010.7
• linux-image-snapdragon - 5.0.0.1014.7
• linux-image-virtual - 5.0.0.17.18

Ubuntu 18.10

• linux-image-4.18.0-1013-gcp - 4.18.0-1013.14
• linux-image-4.18.0-1014-kvm - 4.18.0-1014.14
• linux-image-4.18.0-1016-raspi2 - 4.18.0-1016.18
• linux-image-4.18.0-1018-aws - 4.18.0-1018.20
• linux-image-4.18.0-1020-azure - 4.18.0-1020.20
• linux-image-4.18.0-22-generic - 4.18.0-22.23
• linux-image-4.18.0-22-generic-lpae - 4.18.0-22.23
• linux-image-4.18.0-22-lowlatency - 4.18.0-22.23
• linux-image-4.18.0-22-snapdragon - 4.18.0-22.23
• linux-image-aws - 4.18.0.1018.18
• linux-image-azure - 4.18.0.1020.21
• linux-image-gcp - 4.18.0.1013.13
• linux-image-generic - 4.18.0.22.23
• linux-image-generic-lpae - 4.18.0.22.23
• linux-image-gke - 4.18.0.1013.13
• linux-image-kvm - 4.18.0.1014.14
• linux-image-lowlatency - 4.18.0.22.23
• linux-image-raspi2 - 4.18.0.1016.13
• linux-image-snapdragon - 4.18.0.22.23
• linux-image-virtual - 4.18.0.22.23

Ubuntu 18.04

• linux-image-4.15.0-1015-oracle - 4.15.0-1015.17
• linux-image-4.15.0-1034-gcp - 4.15.0-1034.36
• linux-image-4.15.0-1036-kvm - 4.15.0-1036.36
• linux-image-4.15.0-1038-raspi2 - 4.15.0-1038.40
• linux-image-4.15.0-1041-aws - 4.15.0-1041.43
• linux-image-4.15.0-1043-oem - 4.15.0-1043.48
• linux-image-4.15.0-1055-snapdragon - 4.15.0-1055.59
• linux-image-4.15.0-52-generic - 4.15.0-52.56
• linux-image-4.15.0-52-generic-lpae - 4.15.0-52.56
• linux-image-4.15.0-52-lowlatency - 4.15.0-52.56
• linux-image-4.18.0-1020-azure - 4.18.0-1020.20~18.04.1
• linux-image-4.18.0-22-generic - 4.18.0-22.23~18.04.1
• linux-image-4.18.0-22-generic-lpae - 4.18.0-22.23~18.04.1
• linux-image-4.18.0-22-lowlatency - 4.18.0-22.23~18.04.1
• linux-image-4.18.0-22-snapdragon - 4.18.0-22.23~18.04.1
• linux-image-aws - 4.15.0.1041.40
• linux-image-azure - 4.18.0.1020.19
• linux-image-gcp - 4.15.0.1034.36
• linux-image-generic - 4.15.0.52.54
• linux-image-generic-hwe-18.04 - 4.18.0.22.72
• linux-image-generic-lpae - 4.15.0.52.54
• linux-image-generic-lpae-hwe-18.04 - 4.18.0.22.72
• linux-image-kvm - 4.15.0.1036.36
• linux-image-lowlatency - 4.15.0.52.54
• linux-image-lowlatency-hwe-18.04 - 4.18.0.22.72
• linux-image-oem - 4.15.0.1043.47
• linux-image-oracle - 4.15.0.1015.18
• linux-image-raspi2 - 4.15.0.1038.36
• linux-image-snapdragon - 4.15.0.1055.58
• linux-image-snapdragon-hwe-18.04 - 4.18.0.22.72
• linux-image-virtual - 4.15.0.52.54
• linux-image-virtual-hwe-18.04 - 4.18.0.22.72

Ubuntu 16.04

• linux-image-4.15.0-1015-oracle - 4.15.0-1015.17~16.04.1
• linux-image-4.15.0-1034-gcp - 4.15.0-1034.36~16.04.1
• linux-image-4.15.0-1041-aws - 4.15.0-1041.43~16.04.1
• linux-image-4.15.0-1047-azure - 4.15.0-1047.51
• linux-image-4.15.0-52-generic - 4.15.0-52.56~16.04.1
• linux-image-4.15.0-52-generic-lpae - 4.15.0-52.56~16.04.1
• linux-image-4.15.0-52-lowlatency - 4.15.0-52.56~16.04.1
• linux-image-4.4.0-1048-kvm - 4.4.0-1048.55
• linux-image-4.4.0-1085-aws - 4.4.0-1085.96
• linux-image-4.4.0-1111-raspi2 - 4.4.0-1111.120
• linux-image-4.4.0-1115-snapdragon - 4.4.0-1115.121
• linux-image-4.4.0-151-generic - 4.4.0-151.178
• linux-image-4.4.0-151-generic-lpae - 4.4.0-151.178
• linux-image-4.4.0-151-lowlatency - 4.4.0-151.178
• linux-image-4.4.0-151-powerpc-e500mc - 4.4.0-151.178
• linux-image-4.4.0-151-powerpc-smp - 4.4.0-151.178
• linux-image-4.4.0-151-powerpc64-emb - 4.4.0-151.178
• linux-image-4.4.0-151-powerpc64-smp - 4.4.0-151.178
• linux-image-aws - 4.4.0.1085.88
• linux-image-aws-hwe - 4.15.0.1041.41
• linux-image-azure - 4.15.0.1047.51
• linux-image-gcp - 4.15.0.1034.48
• linux-image-generic - 4.4.0.151.159
• linux-image-generic-hwe-16.04 - 4.15.0.52.73
• linux-image-generic-lpae - 4.4.0.151.159
• linux-image-generic-lpae-hwe-16.04 - 4.15.0.52.73
• linux-image-gke - 4.15.0.1034.48
• linux-image-kvm - 4.4.0.1048.48
• linux-image-lowlatency - 4.4.0.151.159
• linux-image-lowlatency-hwe-16.04 - 4.15.0.52.73
• linux-image-oem - 4.15.0.52.73
• linux-image-oracle - 4.15.0.1015.9
• linux-image-powerpc-e500mc - 4.4.0.151.159
• linux-image-powerpc-smp - 4.4.0.151.159
• linux-image-powerpc64-emb - 4.4.0.151.159
• linux-image-powerpc64-smp - 4.4.0.151.159
• linux-image-raspi2 - 4.4.0.1111.111
• linux-image-snapdragon - 4.4.0.1115.107
• linux-image-virtual - 4.4.0.151.159
• linux-image-virtual-hwe-16.04 - 4.15.0.52.73

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

• CVE-2019-11477
• CVE-2019-11478
• https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic

Related notices

• USN-4017-2