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Ubuntu 20.04: USN-4948-1 Critical: Linux Kernel DoS Threats

ubuntu
Calendar Grey May 11, 2021
Dist Ubuntu Esm H88
Important security alerts for Ubuntu's linux-oem-5.10 highlighting various kernel vulnerabilities necessitating prompt updates.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.10: Linux kernel for OEM systems

Details:

Ryota Shiga discovered that the eBPF implementation in the Linux kernel did

not properly verify that a BPF program only reserved as much memory for a

ring buffer as was allocated. A local attacker could use this to cause a

denial of service (system crash) or execute arbitrary code. (CVE-2021-3489)

Manfred Paul discovered that the eBPF implementation in the Linux kernel

did not properly track bounds on bitwise operations. A local attacker could

use this to cause a denial of service (system crash) or execute arbitrary

code. (CVE-2021-3490)

Billy Jheng Bing-Jhong discovered that the io_uring implementation of the

Linux kernel did not properly enforce the MAX_RW_COUNT limit in some

situations. A local attacker could use this to cause a denial of service

(system crash) or execute arbitrary code. (CVE-2021-3491)

Kiyin (尹亮) ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service ubuntu kernel exploit system crash linux kernel linux-oem

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.10.0-1026-oem     5.10.0-1026.27
  linux-image-oem-20.04b          5.10.0.1026.27

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-4948-1

CVE-2020-25670, CVE-2020-25671, CVE-2020-25672, CVE-2021-28688,

CVE-2021-28951, CVE-2021-28952, CVE-2021-28964, CVE-2021-28971,

CVE-2021-28972, CVE-2021-29264, CVE-2021-29266, CVE-2021-29646,

CVE-2021-29647, CVE-2021-29649, CVE-2021-29650, CVE-2021-29657,

CVE-2021-31916, CVE-2021-3483, CVE-2021-3489, CVE-2021-3490,

CVE-2021-3491

Severity
critical
Lowest
Low
Medium
High
Critical

May 11, 2021

Topics%20covered

Topics Covered

security advisory denial of service ubuntu kernel exploit system crash linux kernel linux-oem

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1026.27

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