Ubuntu 20.04 LTS: 5813-1 Critical - Denial of Service via Kernel Overflow

ubuntu

January 19, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

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

- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems

- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors

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...

Read the Full Advisory

Topics Covered

security advisory denial of service buffer overflow software update ubuntu

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1062-gkeop    5.4.0-1062.66
   linux-image-gkeop               5.4.0.1062.60
   linux-image-gkeop-5.4           5.4.0.1062.60

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1113-oracle  4.15.0-1113.124
   linux-image-4.15.0-1144-snapdragon  4.15.0-1144.154
   linux-image-5.4.0-1094-aws      5.4.0-1094.102~18.04.1
   linux-image-5.4.0-137-generic   5.4.0-137.154~18.04.1
   linux-image-5.4.0-137-generic-lpae  5.4.0-137.154~18.04.1
   linux-image-5.4.0-137-lowlatency  5.4.0-137.154~18.04.1
   linux-image-aws                 5.4.0.1094.72
   linux-image-generic-hwe-18.04   5.4.0.137.154~18.04.112
   linux-image-generic-lpae-hwe-18.04  5.4.0.137.154~18.04.112
   linux-image-lowlatency-hwe-18.04  5.4.0.137.154~18.04.112
   linux-image-oem                 5.4.0.137.154~18.04.112
   linux-image-oem-osp1            5.4.0.137.154~18.04.112
   linux-image-oracle-lts-18.04    4.15.0.1113.118
   linux-image-snapdragon          4.15.0.1144.143
   linux-image-snapdragon-hwe-18.04  5.4.0.137.154~18.04.112
   linux-image-virtual-hwe-18.04   5.4.0.137.154~18.04.112

Ubuntu 16.04 ESM:
   linux-image-4.15.0-1113-oracle  4.15.0-1113.124~16.04.1
   linux-image-oracle              4.15.0.1113.95

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.