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Ubuntu Security Notice USN-6602-1

Ubuntu Security Notice 6602-1 - 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 a race condition existed in the Linux kernel when performing operations with kernel objects, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service or execute arbitrary code.

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==========================================================================Ubuntu Security Notice USN-6602-1January 25, 2024linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 16.04 LTS (Available with Ubuntu Pro)- Ubuntu 14.04 LTS (Available with Ubuntu Pro)Summary:Several security issues were fixed in the Linux kernel.Software Description:- linux: Linux kernel- linux-kvm: Linux kernel for cloud environments- linux-aws: Linux kernel for Amazon Web Services (AWS) systems- linux-lts-xenial: Linux hardware enablement kernel from Xenial for TrustyDetails: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 a race condition existed in the Linux kernel whenperforming operations with kernel objects, leading to an out-of-boundswrite. A local attacker could use this to cause a denial of service (systemcrash) or execute arbitrary code. (CVE-2023-45863)It was discovered that the CIFS network file system implementation in theLinux kernel did not properly validate the server frame size in certainsituation, leading to an out-of-bounds read vulnerability. An attackercould use this to construct a malicious CIFS image that, when operated on,could cause a denial of service (system crash) or possibly expose sensitiveinformation. (CVE-2023-6606)Budimir Markovic, Lucas De Marchi, and Pengfei Xu discovered that the perfsubsystem in the Linux kernel did not properly validate all event sizeswhen attaching new events, leading to an out-of-bounds write vulnerability.A local attacker could use this to cause a denial of service (system crash)or possibly execute arbitrary code. (CVE-2023-6931)It was discovered that the IGMP protocol implementation in the Linux kernelcontained a race condition, leading to a use-after-free vulnerability. Alocal attacker could use this to cause a denial of service (system crash)or possibly execute arbitrary code. (CVE-2023-6932)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 16.04 LTS (Available with Ubuntu Pro):   linux-image-4.4.0-1128-kvm      4.4.0-1128.138   linux-image-4.4.0-250-generic   4.4.0-250.284   linux-image-4.4.0-250-lowlatency  4.4.0-250.284   linux-image-generic             4.4.0.250.256   linux-image-generic-lts-xenial  4.4.0.250.256   linux-image-kvm                 4.4.0.1128.125   linux-image-lowlatency          4.4.0.250.256   linux-image-lowlatency-lts-xenial  4.4.0.250.256   linux-image-virtual             4.4.0.250.256   linux-image-virtual-lts-xenial  4.4.0.250.256Ubuntu 14.04 LTS (Available with Ubuntu Pro):   linux-image-4.4.0-1127-aws      4.4.0-1127.133   linux-image-4.4.0-250-generic   4.4.0-250.284~14.04.1   linux-image-4.4.0-250-lowlatency  4.4.0-250.284~14.04.1   linux-image-aws                 4.4.0.1127.124   linux-image-generic-lts-xenial  4.4.0.250.217   linux-image-lowlatency-lts-xenial  4.4.0.250.217   linux-image-virtual-lts-xenial  4.4.0.250.217After 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-6602-1   CVE-2023-20588, CVE-2023-45863, CVE-2023-6606, CVE-2023-6931,   CVE-2023-6932

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Ubuntu Security Notice USN-6387-1

Ubuntu Security Notice 6387-1 - 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-6384-1

Ubuntu Security Notice 6384-1 - 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. Lonial Con discovered that the netfilter subsystem in the Linux kernel contained a memory leak when handling certain element flush operations. A local attacker could use this to expose sensitive information.

Ubuntu Security Notice USN-6383-1

Ubuntu Security Notice 6383-1 - 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 ARM64 KVM implementation in the Linux kernel did not properly restrict hypervisor memory access. An attacker in a guest VM could use this to execute arbitrary code in the host OS.

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