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Ubuntu Security Notice USN-6462-2

Ubuntu Security Notice 6462-2 - Seth Jenkins discovered that the Linux kernel did not properly perform address randomization for a per-cpu memory management structure. A local attacker could use this to expose sensitive information or in conjunction with another kernel vulnerability. Yu Hao and Weiteng Chen discovered that the Bluetooth HCI UART driver 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.

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==========================================================================Ubuntu Security Notice USN-6462-2November 10, 2023linux-iot vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 20.04 LTSSummary:Several security issues were fixed in the Linux kernel.Software Description:- linux-iot: Linux kernel for IoT platformsDetails:Seth Jenkins discovered that the Linux kernel did not properly performaddress randomization for a per-cpu memory management structure. A localattacker could use this to expose sensitive information (kernel memory) orin conjunction with another kernel vulnerability. (CVE-2023-0597)Yu Hao and Weiteng Chen discovered that the Bluetooth HCI UART driver inthe Linux kernel contained a race condition, leading to a null pointerdereference vulnerability. A local attacker could use this to cause adenial of service (system crash). (CVE-2023-31083)Lin Ma discovered that the Netlink Transformation (XFRM) subsystem in theLinux kernel contained a null pointer dereference vulnerability in somesituations. A local privileged attacker could use this to cause a denial ofservice (system crash). (CVE-2023-3772)It was discovered that the Siano USB MDTV receiver device driver in theLinux kernel did not properly handle device initialization failures incertain situations, leading to a use-after-free vulnerability. A physicallyproximate attacker could use this cause a denial of service (system crash).(CVE-2023-4132)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 20.04 LTS:   linux-image-5.4.0-1025-iot      5.4.0-1025.26After 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-6462-2   https://ubuntu.com/security/notices/USN-6462-1   CVE-2023-0597, CVE-2023-31083, CVE-2023-3772, CVE-2023-4132Package Information:   https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1025.26

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Ubuntu Security Notice USN-6465-2

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CVE-2023-0597: git/torvalds/linux.git - Linux kernel source tree

A flaw possibility of memory leak in the Linux kernel cpu_entry_area mapping of X86 CPU data to memory was found in the way user can guess location of exception stack(s) or other important data. A local user could use this flaw to get access to some important data with expected location in memory.

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