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Ubuntu Security Notice USN-6387-2
Ubuntu Security Notice 6387-2 - Jana Hofmann, Emanuele Vannacci, Cedric Fournet, Boris Kopf, and Oleksii Oleksenko discovered that some AMD processors could leak stale data from division operations in certain situations. A local attacker could possibly use this to expose sensitive information. It was discovered that the bluetooth subsystem in the Linux kernel did not properly handle L2CAP socket release, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.
==========================================================================Ubuntu Security Notice USN-6387-2September 26, 2023linux-bluefield, linux-raspi, linux-raspi-5.4 vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 20.04 LTS- Ubuntu 18.04 LTS (Available with Ubuntu Pro)Summary:Several security issues were fixed in the Linux kernel.Software Description:- linux-bluefield: Linux kernel for NVIDIA BlueField platforms- linux-raspi: Linux kernel for Raspberry Pi systems- linux-raspi-5.4: Linux kernel for Raspberry Pi systemsDetails:Jana Hofmann, Emanuele Vannacci, Cedric Fournet, Boris Kopf, and OleksiiOleksenko discovered that some AMD processors could leak stale data fromdivision operations in certain situations. A local attacker could possiblyuse this to expose sensitive information. (CVE-2023-20588)It was discovered that the bluetooth subsystem in the Linux kernel did notproperly handle L2CAP socket release, leading to a use-after-freevulnerability. A local attacker could use this to cause a denial of service(system crash) or possibly execute arbitrary code. (CVE-2023-40283)It was discovered that some network classifier implementations in the Linuxkernel contained use-after-free vulnerabilities. A local attacker could usethis to cause a denial of service (system crash) or possibly executearbitrary code. (CVE-2023-4128)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 20.04 LTS: linux-image-5.4.0-1071-bluefield 5.4.0-1071.77 linux-image-5.4.0-1094-raspi 5.4.0-1094.105 linux-image-bluefield 5.4.0.1071.66 linux-image-raspi 5.4.0.1094.124 linux-image-raspi2 5.4.0.1094.124Ubuntu 18.04 LTS (Available with Ubuntu Pro): linux-image-5.4.0-1094-raspi 5.4.0-1094.105~18.04.1 linux-image-raspi-hwe-18.04 5.4.0.1094.91After 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-6387-2 https://ubuntu.com/security/notices/USN-6387-1 CVE-2023-20588, CVE-2023-40283, CVE-2023-4128Package Information: https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1071.77 https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1094.105
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