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Ubuntu: (Multiple Advisories) (CVE-2021-4203): Linux kernel (AWS) vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2021-4203): Linux kernel (AWS) vulnerabilities

Severity

CVSS

(AV:N/AC:M/Au:S/C:P/I:N/A:P)

Published

03/25/2022

Created

05/05/2023

Added

04/10/2023

Modified

04/17/2023

Description

A use-after-free read flaw was found in sock_getsockopt() in net/core/sock.c due to SO_PEERCRED and SO_PEERGROUPS race with listen() (and connect()) in the Linux kernel. In this flaw, an attacker with a user privileges may crash the system or leak internal kernel information.

Solution(s)

ubuntu-upgrade-linux-image-4-4-0-1117-aws
ubuntu-upgrade-linux-image-4-4-0-1118-kvm
ubuntu-upgrade-linux-image-4-4-0-1155-aws
ubuntu-upgrade-linux-image-4-4-0-239-generic
ubuntu-upgrade-linux-image-4-4-0-239-lowlatency
ubuntu-upgrade-linux-image-aws
ubuntu-upgrade-linux-image-generic
ubuntu-upgrade-linux-image-generic-lts-xenial
ubuntu-upgrade-linux-image-kvm
ubuntu-upgrade-linux-image-lowlatency
ubuntu-upgrade-linux-image-lowlatency-lts-xenial
ubuntu-upgrade-linux-image-virtual
ubuntu-upgrade-linux-image-virtual-lts-xenial

References

https://attackerkb.com/topics/cve-2021-4203
CVE - 2021-4203
USN-6001-1
USN-6013-1
USN-6014-1

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