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Ubuntu 20.04 LTS: USN-5875-1 Critical Kernel Issues and DoS Risks

ubuntu
Calendar Grey February 15, 2023
Dist Ubuntu Esm H88
Critical alerts regarding Linux kernel vulnerabilities in Ubuntu 20.04 LTS with imperative patching instructions for system managers.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gke: Linux kernel for Google Container Engine (GKE) systems

Details:

It was discovered that the NFSD implementation in the Linux kernel did not

properly handle some RPC messages, leading to a buffer overflow. A remote

attacker could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2022-43945)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation

in the Linux kernel contained multiple use-after-free vulnerabilities. A

physically proximate attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Broadcom FullMAC USB WiFi driver in the Linux

kernel did not properly perform bounds checking in some situations. A

physically proximate attacker could use this to craft a malicious USB

device that when inserted, could cause a d...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory buffer overflow critical Ubuntu kernel doS attack GKE

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1094-gke      5.4.0-1094.101
   linux-image-gke                 5.4.0.1094.99
   linux-image-gke-5.4             5.4.0.1094.99

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-5875-1

CVE-2022-3628, CVE-2022-3640, CVE-2022-3643, CVE-2022-3649,

CVE-2022-41849, CVE-2022-41850, CVE-2022-42895, CVE-2022-42896,

CVE-2022-43945, CVE-2022-45934, CVE-2023-20928

Severity
critical
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Critical

February 15, 2023

Topics%20covered

Topics Covered

security advisory buffer overflow critical Ubuntu kernel doS attack GKE

Package Information

https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1094.101

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