[USN-4983-1] Linux kernel (OEM) vulnerabilities

========================================================================== Ubuntu Security Notice USN-4983-1 June 03, 2021
linux-oem-5.10 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description: – linux-oem-5.10: Linux kernel for OEM systems
Details:
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33200)
Piotr Krysiuk and Benedict Schlueter discovered that the eBPF implementation in the Linux kernel performed out of bounds speculation on pointer arithmetic. A local attacker could use this to expose sensitive information. (CVE-2021-29155)
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent speculative loads in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-31829)
Reiji Watanabe discovered that the KVM VMX implementation in the Linux kernel did not properly prevent user space from tampering with an array index value, leading to a potential out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3501)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: linux-image-5.10.0-1029-oem 5.10.0-1029.30 linux-image-oem-20.04 5.10.0.1029.30 linux-image-oem-20.04b 5.10.0.1029.30
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-4983-1 CVE-2021-29155, CVE-2021-31829, CVE-2021-33200, CVE-2021-3501
Package Information: launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1029.30