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Ubuntu Security Notice USN-6056-1
Ubuntu Security Notice 6056-1 - It was discovered that a race condition existed in the Xen transport layer implementation for the 9P file system protocol in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or expose sensitive information.
==========================================================================Ubuntu Security Notice USN-6056-1May 05, 2023linux-oem-6.1 vulnerability==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 22.04 LTSSummary:The guest VM system could be made to crash or expose sensitive information.Software Description:- linux-oem-6.1: Linux kernel for OEM systemsDetails:It was discovered that a race condition existed in the Xen transport layerimplementation for the 9P file system protocol in the Linux kernel, leadingto a use-after-free vulnerability. A local attacker could use this to causea denial of service (guest crash) or expose sensitive information (guestkernel memory).Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 22.04 LTS: linux-image-6.1.0-1010-oem 6.1.0-1010.10 linux-image-oem-22.04c 6.1.0.1010.10After 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-6056-1 CVE-2023-1859Package Information: https://launchpad.net/ubuntu/+source/linux-oem-6.1/6.1.0-1010.10Related news
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A use-after-free flaw was found in xen_9pfs_front_removet in net/9p/trans_xen.c in Xen transport for 9pfs in the Linux Kernel. This flaw could allow a local attacker to crash the system due to a race problem, possibly leading to a kernel information leak.
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