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Ubuntu 20.04 LTS USN-5096-1 Critical: Kernel Security Updates

ubuntu
Calendar Grey September 29, 2021
Dist Ubuntu Esm H88
This Ubuntu 20.04 LTS advisory highlights critical kernel vulnerabilities, recent updates improve system security and stability for users
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.13: Linux kernel for OEM systems

Details:

Valentina Palmiotti discovered that the io_uring subsystem in the Linux

kernel could be coerced to free adjacent memory. A local attacker could use

this to execute arbitrary code. (CVE-2021-41073)

Benedict Schlueter discovered that the BPF subsystem in the Linux kernel

did not properly protect against Speculative Store Bypass (SSB) side-

channel attacks in some situations. A local attacker could possibly use

this to expose sensitive information. (CVE-2021-34556)

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not

properly protect against Speculative Store Bypass (SSB) side-channel

attacks in some situations. A local attacker could possibly use this to

expose sensitive information. (CVE-2021-35477)

Murray McAllister discovered that the joystick device interface in the

Linux kernel did not properly validate data passed via...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel arbitrary code ubuntu risk mitigation memory exposure

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.13.0-1014-oem     5.13.0-1014.18
  linux-image-oem-20.04c          5.13.0.1014.18

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-5096-1

CVE-2021-34556, CVE-2021-35477, CVE-2021-3612, CVE-2021-3679,

CVE-2021-37159, CVE-2021-3732, CVE-2021-38160, CVE-2021-38166,

CVE-2021-38199, CVE-2021-38201, CVE-2021-38202, CVE-2021-38203,

CVE-2021-38204, CVE-2021-38205, CVE-2021-40490, CVE-2021-41073

Severity
critical
Lowest
Low
Medium
High
Critical

September 29, 2021

Topics%20covered

Topics Covered

security advisory denial of service kernel arbitrary code ubuntu risk mitigation memory exposure

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.13/5.13.0-1014.18

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