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Ubuntu 18.04 LTS USN-5630-1 Critical Linux Kernel DoS Threat

ubuntu
Calendar Grey September 22, 2022
Dist Ubuntu Esm H88
Remedies addressing various security flaws in the Ubuntu 18.04 LTS Linux kernel related to vulnerabilities in Raspberry Pi systems.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the framebuffer driver on the Linux kernel did

not verify size limits when changing font or screen size, leading to an

out-of-bounds write. A local attacker could use this to cause a denial

of service (system crash) or possibly execute arbitrary code.

(CVE-2021-33655)

Moshe Kol, Amit Klein and Yossi Gilad discovered that the IP

implementation in the Linux kernel did not provide sufficient

randomization when calculating port offsets. An attacker could possibly

use this to expose sensitive information.

(CVE-2022-1012, CVE-2022-32296)

Norbert Slusarek discovered that a race condition existed in the perf

subsystem in the Linux kernel, resulting in a use-after-free

vulnerability. A privileged local attacker could use this to cause a

denial of service (system crash) or possibly execute a...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel linux-raspi

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
   linux-image-5.4.0-1070-raspi    5.4.0-1070.80~18.04.1
   linux-image-raspi-hwe-18.04     5.4.0.1070.70

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-5630-1

CVE-2021-33655, CVE-2022-1012, CVE-2022-1729, CVE-2022-2503,

CVE-2022-32296, CVE-2022-36946

Severity
critical
Lowest
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Critical

September 22, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu linux kernel linux-raspi

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1070.80~18.04.1

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