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Ubuntu Security Notice USN-6576-1

Ubuntu Security Notice 6576-1 - Lonial Con discovered that the netfilter subsystem in the Linux kernel did not properly handle an expired catchall element in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

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==========================================================================Ubuntu Security Notice USN-6576-1January 10, 2024linux-oem-6.1 vulnerability==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 22.04 LTSSummary:The system could be made to crash or run programs as an administrator.Software Description:- linux-oem-6.1: Linux kernel for OEM systemsDetails:Lonial Con discovered that the netfilter subsystem in the Linux kernel didnot properly handle an expired catchall element in some situations, leadingto a use-after-free vulnerability. A local attacker could use this to causea denial of service (system crash) or possibly execute arbitrary code.Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 22.04 LTS:   linux-image-6.1.0-1028-oem      6.1.0-1028.28   linux-image-oem-22.04           6.1.0.1028.29   linux-image-oem-22.04a          6.1.0.1028.29   linux-image-oem-22.04b          6.1.0.1028.29   linux-image-oem-22.04c          6.1.0.1028.29After 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-6576-1   CVE-2023-6111Package Information:   https://launchpad.net/ubuntu/+source/linux-oem-6.1/6.1.0-1028.28

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CVE-2023-6111

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The function nft_trans_gc_catchall did not remove the catchall set element from the catchall_list when the argument sync is true, making it possible to free a catchall set element many times. We recommend upgrading past commit 93995bf4af2c5a99e2a87f0cd5ce547d31eb7630.

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