SB2021031628 - Ubuntu update for linux

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2020-36158)

The vulnerability allows a local privileged user to execute arbitrary code.

The vulnerability exists due to buffer overflow error within the mwifiex_cmd_802_11_ad_hoc_start() function in drivers/net/wireless/marvell/mwifiex/join.c. A local privileged user can execute arbitrary code.

2) Memory corruption (CVE-ID: CVE-2021-20239)

The vulnerability allows a local user to gain access to sensitive information.

A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.

3) Use-after-free (CVE-ID: CVE-2021-3347)

The vulnerability allows a local user to elevate privileges on the system.

The vulnerability exists due to a use-after-free error when handling PI futexes. A local user can run a specially crafted program to trigger a use-after-free error and execute arbitrary code with elevated privileges.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-4878-1