[USN-5209-1] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-5209-1 January 06, 2022
linux, linux-aws, linux-aws-hwe, linux-azure-4.15, linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 18.04 LTS – Ubuntu 16.04 ESM – 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-dell300x: Linux kernel for Dell 300x platforms – linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems – linux-kvm: Linux kernel for cloud environments – linux-oracle: Linux kernel for Oracle Cloud systems – linux-raspi2: Linux kernel for Raspberry Pi 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:
Nadav Amit discovered that the hugetlb implementation in the Linux kernel did not perform TLB flushes under certain conditions. A local attacker could use this to leak or alter data from other processes that use huge pages. (CVE-2021-4002)
It was discovered that a race condition existed in the timer implementation in the Linux kernel. A privileged attacker could use this cause a denial of service. (CVE-2021-20317)
It was discovered that a race condition existed in the overlay file system implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-20321)
It was discovered that the NFC subsystem in the Linux kernel contained a use-after-free vulnerability in its NFC Controller Interface (NCI) implementation. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-3760)
It was discovered that an integer overflow could be triggered in the eBPF implementation in the Linux kernel when preallocating objects for stack maps. A privileged local attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2021-41864)
It was discovered that the ISDN CAPI implementation in the Linux kernel contained a race condition in certain situations that could trigger an array out-of-bounds bug. A privileged local attacker could possibly use this to cause a denial of service or execute arbitrary code. (CVE-2021-43389)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04 LTS: linux-image-4.15.0-1033-dell300x 4.15.0-1033.38 linux-image-4.15.0-1085-oracle 4.15.0-1085.93 linux-image-4.15.0-1101-raspi2 4.15.0-1101.108 linux-image-4.15.0-1105-kvm 4.15.0-1105.107 linux-image-4.15.0-1114-gcp 4.15.0-1114.128 linux-image-4.15.0-1118-aws 4.15.0-1118.125 linux-image-4.15.0-1118-snapdragon 4.15.0-1118.127 linux-image-4.15.0-1129-azure 4.15.0-1129.142 linux-image-4.15.0-166-generic 4.15.0-166.174 linux-image-4.15.0-166-generic-lpae 4.15.0-166.174 linux-image-4.15.0-166-lowlatency 4.15.0-166.174 linux-image-aws-lts-18.04 4.15.0.1118.121 linux-image-azure-lts-18.04 4.15.0.1129.102 linux-image-dell300x 4.15.0.1033.35 linux-image-gcp-lts-18.04 4.15.0.1114.133 linux-image-generic 4.15.0.166.155 linux-image-generic-lpae 4.15.0.166.155 linux-image-kvm 4.15.0.1105.101 linux-image-lowlatency 4.15.0.166.155 linux-image-oracle-lts-18.04 4.15.0.1085.95 linux-image-raspi2 4.15.0.1101.99 linux-image-snapdragon 4.15.0.1118.121 linux-image-virtual 4.15.0.166.155
Ubuntu 16.04 ESM: linux-image-4.15.0-1085-oracle 4.15.0-1085.93~16.04.1 linux-image-4.15.0-1114-gcp 4.15.0-1114.128~16.04.1 linux-image-4.15.0-1118-aws 4.15.0-1118.125~16.04.1 linux-image-4.15.0-1129-azure 4.15.0-1129.142~16.04.1 linux-image-4.15.0-166-generic 4.15.0-166.174~16.04.1 linux-image-4.15.0-166-lowlatency 4.15.0-166.174~16.04.1 linux-image-aws-hwe 4.15.0.1118.108 linux-image-azure 4.15.0.1129.120 linux-image-gcp 4.15.0.1114.115 linux-image-generic-hwe-16.04 4.15.0.166.158 linux-image-gke 4.15.0.1114.115 linux-image-lowlatency-hwe-16.04 4.15.0.166.158 linux-image-oem 4.15.0.166.158 linux-image-oracle 4.15.0.1085.73 linux-image-virtual-hwe-16.04 4.15.0.166.158
Ubuntu 14.04 ESM: linux-image-4.15.0-1129-azure 4.15.0-1129.142~14.04.1 linux-image-azure 4.15.0.1129.102
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-5209-1 CVE-2021-20317, CVE-2021-20321, CVE-2021-3760, CVE-2021-4002, CVE-2021-41864, CVE-2021-43389
Package Information: launchpad.net/ubuntu/+source/linux/4.15.0-166.174 launchpad.net/ubuntu/+source/linux-aws/4.15.0-1118.125 launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1129.142 launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1033.38 launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1114.128 launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1105.107 launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1085.93 launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1101.108 launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1118.127