USN-5470-1: Linux kernel (OEM) vulnerabilities
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Ubuntu Security Notice USN-5470-1
June 08, 2022
linux-oem-5.14 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux-oem-5.14: Linux kernel for OEM systems
Details:
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.
(CVE-2022-21499)
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 (system crash) or execute arbitrary code.
(CVE-2022-1966)
Minh Yuan discovered that the floppy driver in the Linux kernel contained a
race condition in some situations, leading to a use-after-free
vulnerability. 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 kernel
did not properly validate sets with multiple ranged fields. A local
attacker could use this to cause a denial of service or execute arbitrary
code. (CVE-2022-1972)
Update instructions:
The problem can be corrected by updating your system to the following
package 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 5.14.0.1042.38
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall 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 perform
this as well.
References:
https://ubuntu.com/security/notices/USN-5470-1
CVE-2022-1836, CVE-2022-1966, CVE-2022-1972, CVE-2022-21499
Package Information:
https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1042.47
A Linux kernel security update has been released for Ubuntu Linux 20.04 LTS.
