[USN-4883-1] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-4883-1 March 20, 2021
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 18.04 LTS – Ubuntu 16.04 LTS – Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in the Linux kernel.
Software Description: – linux: Linux kernel – linux-aws: Linux kernel for Amazon Web Services (AWS) systems – linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems – linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems – linux-kvm: Linux kernel for cloud environments – linux-raspi2: Linux kernel for Raspberry Pi (V8) systems – linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors – 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
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 18.04 LTS: linux-image-4.15.0-1081-raspi2 4.15.0-1081.86 linux-image-4.15.0-1087-kvm 4.15.0-1087.89 linux-image-4.15.0-1095-gcp 4.15.0-1095.108 linux-image-4.15.0-1096-aws 4.15.0-1096.103 linux-image-4.15.0-1098-snapdragon 4.15.0-1098.107 linux-image-4.15.0-1110-azure 4.15.0-1110.122 linux-image-4.15.0-139-generic 4.15.0-139.143 linux-image-4.15.0-139-generic-lpae 4.15.0-139.143 linux-image-4.15.0-139-lowlatency 4.15.0-139.143 linux-image-aws-lts-18.04 4.15.0.1096.99 linux-image-azure-lts-18.04 4.15.0.1110.83 linux-image-gcp-lts-18.04 4.15.0.1095.113 linux-image-generic 4.15.0.139.126 linux-image-generic-lpae 4.15.0.139.126 linux-image-kvm 4.15.0.1087.83 linux-image-lowlatency 4.15.0.139.126 linux-image-powerpc-e500mc 4.15.0.139.126 linux-image-powerpc-smp 4.15.0.139.126 linux-image-powerpc64-emb 4.15.0.139.126 linux-image-powerpc64-smp 4.15.0.139.126 linux-image-raspi2 4.15.0.1081.78 linux-image-snapdragon 4.15.0.1098.101 linux-image-virtual 4.15.0.139.126
Ubuntu 16.04 LTS: linux-image-4.15.0-1095-gcp 4.15.0-1095.108~16.04.1 linux-image-4.15.0-1096-aws 4.15.0-1096.103~16.04.1 linux-image-4.15.0-1110-azure 4.15.0-1110.122~16.04.1 linux-image-4.15.0-139-generic 4.15.0-139.143~16.04.1 linux-image-4.15.0-139-generic-lpae 4.15.0-139.143~16.04.1 linux-image-4.15.0-139-lowlatency 4.15.0-139.143~16.04.1 linux-image-4.4.0-1090-kvm 4.4.0-1090.99 linux-image-4.4.0-1124-aws 4.4.0-1124.138 linux-image-4.4.0-1152-snapdragon 4.4.0-1152.162 linux-image-4.4.0-206-generic 4.4.0-206.238 linux-image-4.4.0-206-generic-lpae 4.4.0-206.238 linux-image-4.4.0-206-lowlatency 4.4.0-206.238 linux-image-4.4.0-206-powerpc-e500mc 4.4.0-206.238 linux-image-4.4.0-206-powerpc-smp 4.4.0-206.238 linux-image-4.4.0-206-powerpc64-emb 4.4.0-206.238 linux-image-4.4.0-206-powerpc64-smp 4.4.0-206.238 linux-image-aws 4.4.0.1124.129 linux-image-aws-hwe 4.15.0.1096.89 linux-image-azure 4.15.0.1110.101 linux-image-azure-edge 4.15.0.1110.101 linux-image-gcp 4.15.0.1095.96 linux-image-generic 4.4.0.206.212 linux-image-generic-hwe-16.04 4.15.0.139.134 linux-image-generic-lpae 4.4.0.206.212 linux-image-generic-lpae-hwe-16.04 4.15.0.139.134 linux-image-gke 4.15.0.1095.96 linux-image-kvm 4.4.0.1090.88 linux-image-lowlatency 4.4.0.206.212 linux-image-lowlatency-hwe-16.04 4.15.0.139.134 linux-image-oem 4.15.0.139.134 linux-image-powerpc-e500mc 4.4.0.206.212 linux-image-powerpc-smp 4.4.0.206.212 linux-image-powerpc64-emb 4.4.0.206.212 linux-image-powerpc64-smp 4.4.0.206.212 linux-image-snapdragon 4.4.0.1152.144 linux-image-virtual 4.4.0.206.212 linux-image-virtual-hwe-16.04 4.15.0.139.134
Ubuntu 14.04 ESM: linux-image-4.15.0-1110-azure 4.15.0-1110.122~14.04.1 linux-image-4.4.0-1088-aws 4.4.0-1088.92 linux-image-aws 4.4.0.1088.85 linux-image-azure 4.15.0.1110.83
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: ubuntu.com/security/notices/USN-4883-1 CVE-2021-27363, CVE-2021-27364, CVE-2021-27365
Package Information: launchpad.net/ubuntu/+source/linux/4.15.0-139.143 launchpad.net/ubuntu/+source/linux-aws/4.15.0-1096.103 launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1110.122 launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1095.108 launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1087.89 launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1081.86 launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1098.107 launchpad.net/ubuntu/+source/linux/4.4.0-206.238 launchpad.net/ubuntu/+source/linux-aws/4.4.0-1124.138 launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1096.103~16.04.1 launchpad.net/ubuntu/+source/linux-azure/4.15.0-1110.122~16.04.1 launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1095.108~16.04.1 launchpad.net/ubuntu/+source/linux-hwe/4.15.0-139.143~16.04.1 launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1090.99 launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1152.162