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Ubuntu Security Notice USN-6533-1
Ubuntu Security Notice 6533-1 - Tom Dohrmann discovered that the Secure Encrypted Virtualization implementation for AMD processors in the Linux kernel contained a race condition when accessing MMIO registers. A local attacker in a SEV guest VM could possibly use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the io_uring subsystem in the Linux kernel contained a race condition, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service.
==========================================================================Ubuntu Security Notice USN-6533-1December 05, 2023linux-oem-6.1 vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 22.04 LTSSummary:Several security issues were fixed in the Linux kernel.Software Description:- linux-oem-6.1: Linux kernel for OEM systemsDetails:Tom Dohrmann discovered that the Secure Encrypted Virtualization (SEV)implementation for AMD processors in the Linux kernel contained a racecondition when accessing MMIO registers. A local attacker in a SEV guest VMcould possibly use this to cause a denial of service (system crash) orpossibly execute arbitrary code. (CVE-2023-46813)It was discovered that the io_uring subsystem in the Linux kernel containeda race condition, leading to a null pointer dereference vulnerability. Alocal attacker could use this to cause a denial of service (system crash).(CVE-2023-46862)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 22.04 LTS: linux-image-6.1.0-1027-oem 6.1.0-1027.27 linux-image-oem-22.04 6.1.0.1027.28 linux-image-oem-22.04a 6.1.0.1027.28 linux-image-oem-22.04b 6.1.0.1027.28 linux-image-oem-22.04c 6.1.0.1027.28After a standard system update you need to reboot your computer to makeall the necessary changes.ATTENTION: Due to an unavoidable ABI change the kernel updates havebeen given a new version number, which requires you to recompile andreinstall 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 performthis as well.References: https://ubuntu.com/security/notices/USN-6533-1 CVE-2023-46813, CVE-2023-46862Package Information: https://launchpad.net/ubuntu/+source/linux-oem-6.1/6.1.0-1027.27Related news
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