USN-4889-1: Linux kernel vulnerabilities

25 March 2021

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Adam Nichols discovered that heap overflows existed in the iSCSI subsystem
in the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2021-27365)

Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did
not properly restrict access to iSCSI transport handles. A local attacker
could use this to cause a denial of service or expose sensitive information
(kernel pointer addresses). (CVE-2021-27363)

Adam Nichols discovered that an out-of-bounds read existed in the iSCSI
subsystem in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or expose sensitive information (kernel
memory). (CVE-2021-27364)

Update instructions

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

Ubuntu 14.04

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.

Related notices

  • USN-4883-1: linux-image-generic, linux-image-kvm, linux-image-powerpc-smp, linux-hwe, linux-image-virtual-lts-xenial, linux-image-generic-hwe-16.04, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-206-lowlatency, linux-image-oracle-lts-18.04, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1081-raspi2, linux-image-powerpc64-emb-lts-utopic, linux-gcp, linux-image-azure-edge, linux-image-lowlatency-lts-xenial, linux-image-virtual-hwe-16.04-edge, linux-image-gcp, linux-image-4.4.0-1148-raspi2, linux-gcp-4.15, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-1090-kvm, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-139-lowlatency, linux-image-4.4.0-206-powerpc-e500mc, linux-image-4.4.0-1088-aws, linux-image-azure, linux-image-powerpc-smp-lts-vivid, linux-image-aws, linux-image-gke, linux-image-powerpc64-emb-lts-xenial, linux-raspi2, linux-image-4.15.0-139-generic, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-206-powerpc64-emb, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-virtual-lts-utopic, linux-image-4.15.0-139-generic-lpae, linux-oracle, linux-image-snapdragon, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-image-generic-lpae-lts-vivid, linux-image-4.15.0-1095-gcp, linux-image-lowlatency, linux-image-4.4.0-1152-snapdragon, linux-image-oem, linux-image-4.15.0-1110-azure, linux-azure, linux-image-4.15.0-1087-kvm, linux-image-azure-lts-18.04, linux-image-4.4.0-1124-aws, linux-image-generic-lts-xenial, linux-azure-4.15, linux-image-powerpc-e500mc, linux-image-gcp-lts-18.04, linux-image-4.15.0-1067-oracle, linux-image-lowlatency-lts-utopic, linux-image-4.15.0-1098-snapdragon, linux-image-generic-lpae-hwe-16.04-edge, linux-image-powerpc-e500mc-lts-wily, linux-image-generic-lpae-hwe-16.04, linux-image-generic-lts-wily, linux-aws-hwe, linux-image-generic-lpae-lts-utopic, linux-aws, linux-image-generic-hwe-16.04-edge, linux-image-generic-lts-vivid, linux-image-generic-lpae, linux-image-powerpc64-smp-lts-xenial, linux-image-lowlatency-lts-wily, linux-kvm, linux-image-powerpc-e500mc-lts-utopic, linux-image-aws-hwe, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-206-generic, linux-image-powerpc64-smp, linux, linux-image-powerpc64-emb-lts-vivid, linux-image-aws-lts-18.04, linux-snapdragon, linux-image-virtual-lts-wily, linux-image-generic-lts-utopic, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-206-powerpc-smp, linux-image-4.4.0-206-powerpc64-smp, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-oracle, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-utopic, linux-image-4.15.0-1096-aws, linux-image-4.4.0-206-generic-lpae, linux-image-lowlatency-hwe-16.04-edge, linux-image-virtual
  • USN-4887-1: linux-image-virtual-hwe-20.04, linux-image-generic, linux-image-generic-64k-hwe-20.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-kvm, linux-hwe, linux-image-virtual-hwe-20.04-edge, linux-image-5.4.0-1036-kvm, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.3.0-72-lowlatency, linux-gcp, linux-image-azure-edge, linux-image-generic-hwe-20.04, linux-image-5.10.0-1019-oem, linux-gke-5.4, linux-image-gcp, linux-image-5.4.0-70-generic, linux-image-5.8.0-48-generic-64k, linux-image-generic-64k, linux-image-raspi2-hwe-18.04-edge, linux-raspi2-5.3, linux-aws-5.4, linux-image-5.4.0-1012-gkeop, linux-image-azure, linux-image-aws, linux-image-gke, linux-azure-5.4, linux-image-5.8.0-1019-raspi, linux-image-generic-lpae-hwe-20.04, linux-image-generic-hwe-18.04, linux-gkeop, linux-image-gke-5.4, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.4.0-1041-aws, linux-image-5.8.0-1027-aws, linux-image-generic-hwe-18.04-edge, linux-image-oem-osp1, linux-image-gkeop-5.3, linux-image-5.4.0-1040-gcp, linux-oracle, linux-image-5.8.0-48-lowlatency, linux-hwe-5.4, linux-gke-5.3, linux-image-5.8.0-48-generic, linux-image-oracle-edge, linux-oracle-5.4, linux-image-raspi2, linux-image-5.8.0-1026-azure, linux-image-lowlatency, linux-image-5.4.0-70-generic-lpae, linux-oem-5.10, linux-image-oem, linux-gkeop-5.4, linux-azure, linux-image-generic-hwe-20.04-edge, linux-image-5.8.0-48-generic-lpae, linux-image-5.4.0-1043-azure, linux-image-gcp-edge, linux-image-5.4.0-1039-gke, linux-image-raspi-nolpae, linux-raspi, linux-image-oem-20.04b, linux-image-lowlatency-hwe-20.04-edge, linux-image-lowlatency-hwe-18.04, linux-image-5.4.0-70-lowlatency, linux-aws, linux-image-aws-edge, linux-image-5.4.0-1032-raspi, linux-image-generic-lpae-hwe-18.04, linux-image-gkeop-5.4, linux-raspi-5.4, linux-image-snapdragon-hwe-18.04, linux-gcp-5.4, linux-image-virtual-hwe-18.04, linux-image-oem-20.04, linux-image-generic-lpae, linux-kvm, linux-image-raspi-hwe-18.04, linux-image-gkeop, linux, linux-oem-5.6, linux-image-5.8.0-1019-raspi-nolpae, linux-hwe-5.8, linux-image-raspi, linux-image-raspi-hwe-18.04-edge, linux-image-5.3.0-1038-raspi2, linux-image-5.8.0-1026-gcp, linux-image-generic-lpae-hwe-20.04-edge, linux-image-oracle, linux-image-5.3.0-72-generic, linux-image-5.8.0-1024-oracle, linux-image-raspi2-hwe-18.04, linux-image-snapdragon-hwe-18.04-edge, linux-image-virtual-hwe-18.04-edge, linux-image-gke-5.3, linux-image-5.3.0-1041-gke, linux-image-lowlatency-hwe-20.04, linux-image-oem-20.04-edge, linux-image-5.4.0-1041-oracle, linux-image-5.8.0-1022-kvm, linux-image-5.6.0-1052-oem, linux-image-virtual
  • USN-4901-1: linux-image-3.13.0-185-generic, linux-image-generic-lts-trusty, linux-lts-trusty