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Ubuntu Security Notice USN-5470-1
Ubuntu Security Notice 5470-1 - It was discovered that the Linux kernel did not properly restrict access to the kernel debugger when booted in secure boot environments. A privileged attacker could use this to bypass UEFI Secure Boot restrictions. Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code.
=========================================================================Ubuntu Security Notice USN-5470-1June 08, 2022linux-oem-5.14 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-oem-5.14: Linux kernel for OEM systemsDetails:It was discovered that the Linux kernel did not properly restrict access tothe kernel debugger when booted in secure boot environments. A privilegedattacker could use this to bypass UEFI Secure Boot restrictions.(CVE-2022-21499)Aaron Adams discovered that the netfilter subsystem in the Linux kernel didnot properly handle the removal of stateful expressions in some situations,leading to a use-after-free vulnerability. A local attacker could use thisto cause a denial of service (system crash) or execute arbitrary code.(CVE-2022-1966)Minh Yuan discovered that the floppy driver in the Linux kernel contained arace condition in some situations, 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-2022-1836)Ziming Zhang discovered that the netfilter subsystem in the Linux kerneldid not properly validate sets with multiple ranged fields. A localattacker could use this to cause a denial of service or execute arbitrarycode. (CVE-2022-1972)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 20.04 LTS: linux-image-5.14.0-1042-oem 5.14.0-1042.47 linux-image-oem-20.04 5.14.0.1042.38 linux-image-oem-20.04b 5.14.0.1042.38 linux-image-oem-20.04c 5.14.0.1042.38 linux-image-oem-20.04d 5.14.0.1042.38After 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-5470-1 CVE-2022-1836, CVE-2022-1966, CVE-2022-1972, CVE-2022-21499Package Information: https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1042.47
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Ubuntu Security Notice 5469-1 - It was discovered that the Linux kernel did not properly restrict access to the kernel debugger when booted in secure boot environments. A privileged attacker could use this to bypass UEFI Secure Boot restrictions. Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code.
Ubuntu Security Notice 5469-1 - It was discovered that the Linux kernel did not properly restrict access to the kernel debugger when booted in secure boot environments. A privileged attacker could use this to bypass UEFI Secure Boot restrictions. Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code.
Ubuntu Security Notice 5467-1 - It was discovered that the Linux kernel did not properly restrict access to the kernel debugger when booted in secure boot environments. A privileged attacker could use this to bypass UEFI Secure Boot restrictions. Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or execute arbitrary code.
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