[USN-5361-1] Linux kernel vulnerabilities


========================================================================== Ubuntu Security Notice USN-5361-1 April 01, 2022
linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– 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-kvm: Linux kernel for cloud environments – linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
Details:
It was discovered that the VFIO PCI driver in the Linux kernel did not properly handle attempts to access disabled memory spaces. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-12888)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation accepted plaintext fragments in certain situations. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145)
It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An attacker could possibly use this to expose sensitive information (WiFi network traffic). (CVE-2020-3702)
It was discovered a race condition existed in the Unix domain socket implementation in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-0920)
It was discovered that the IPv6 implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-0935)
Zygo Blaxell discovered that the btrfs file system implementation in the Linux kernel contained a race condition during certain cloning operations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-28964)
Dan Carpenter discovered that the block device manager (dm) implementation in the Linux kernel contained a buffer overflow in the ioctl for listing devices. A privileged local attacker could use this to cause a denial of service (system crash). (CVE-2021-31916)
It was discovered that the Option USB High Speed Mobile device driver in the Linux kernel did not properly handle error conditions. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-37159)
It was discovered that the network packet filtering implementation in the Linux kernel did not properly initialize information in certain circumstances. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-39636)
Jann Horn discovered a race condition in the Unix domain socket implementation in the Linux kernel that could result in a read-after-free. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-4083)
Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel did not properly perform bounds checking in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-42739)
Brendan Dolan-Gavitt discovered that the Marvell WiFi-Ex USB device driver in the Linux kernel did not properly handle some error conditions. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-43976)
Amit Klein discovered that the IPv4 implementation in the Linux kernel could disclose internal state in some situations. An attacker could possibly use this to expose sensitive information. (CVE-2021-45486)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04 ESM: linux-image-4.4.0-1104-kvm 4.4.0-1104.113 linux-image-4.4.0-1139-aws 4.4.0-1139.153 linux-image-4.4.0-223-generic 4.4.0-223.256 linux-image-4.4.0-223-lowlatency 4.4.0-223.256 linux-image-aws 4.4.0.1139.144 linux-image-generic 4.4.0.223.230 linux-image-kvm 4.4.0.1104.102 linux-image-lowlatency 4.4.0.223.230 linux-image-virtual 4.4.0.223.230
Ubuntu 14.04 ESM: linux-image-4.4.0-1103-aws 4.4.0-1103.108 linux-image-4.4.0-223-generic 4.4.0-223.256~14.04.1 linux-image-4.4.0-223-lowlatency 4.4.0-223.256~14.04.1 linux-image-aws 4.4.0.1103.101 linux-image-generic-lts-xenial 4.4.0.223.194 linux-image-lowlatency-lts-xenial 4.4.0.223.194 linux-image-virtual-lts-xenial 4.4.0.223.194
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-5361-1 CVE-2020-12888, CVE-2020-26141, CVE-2020-26145, CVE-2020-3702, CVE-2021-0920, CVE-2021-0935, CVE-2021-28964, CVE-2021-31916, CVE-2021-37159, CVE-2021-39636, CVE-2021-4083, CVE-2021-42739, CVE-2021-43976, CVE-2021-45486