SB2021102224 - Ubuntu update for linux, linux-aws, linux-aws-hwe and more

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2021102224

SB2021102224 - Ubuntu update for linux, linux-aws, linux-aws-hwe and more

Published: October 22, 2021 Updated: October 31, 2026

Security Bulletin ID SB2021102224
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Adjecent network
Highest impact Data manipulation

Breakdown by Severity

Medium 25% Low 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Cryptographic Issues (CVE-ID: CVE-2020-3702)

CWE-ID: CWE-310 - Cryptographic Issues

CVSSv4: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:L/SA:N]


The vulnerability allows a remote attacker to gain access top sensitive information.

The vulnerability exists due to improper input validation in WIFI driver(Krook). A remote attacker can temporary disable WPA2 or the WPA/WPA2 mixed-mode encryption and intercept traffic in clear text.


2) Incorrect permission assignment for critical resource (CVE-ID: CVE-2021-38198)

CWE-ID: CWE-732 - Incorrect Permission Assignment for Critical Resource

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to perform a denial of service attack.

The vulnerability exists due to arch/x86/kvm/mmu/paging_tmpl.h incorrectly computes the access permissions of a shadow page. A local user can trigger an error to perform a denial of service attack.

3) Race condition (CVE-ID: CVE-2021-40490)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to a race condition in ext4_write_inline_data_end in fs/ext4/inline.c in the ext4 subsystem in the Linux kernel. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.


4) Out-of-bounds write (CVE-ID: CVE-2021-42008)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to a boundary error in the decode_data() function in drivers/net/hamradio/6pack.c in the Linux kernel. A local user can send input from a process that has the CAP_NET_ADMIN capability and escalate privileges on the system.


Remediation

Install update from vendor's website.

References