SB2022011156 - Red Hat Enterprise Linux Advanced Virtualization 8 update for the virt:av and virt-devel:av modules

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Main Vulnerability Database SB2022011156

SB2022011156 - Red Hat Enterprise Linux Advanced Virtualization 8 update for the virt:av and virt-devel:av modules

Published: January 11, 2022

Security Bulletin ID SB2022011156
Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 secuirty vulnerabilities.


1) Infinite loop (CVE-ID: CVE-2021-20257)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in the e1000 NIC emulator when processing transmits (tx) descriptors in process_tx_desc of QEMU. A remote user can consume all available CPU resources and cause denial of service conditions.


2) Off-by-one (CVE-ID: CVE-2021-3930)

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to an off-by-one error in the SCSI device emulation in QEMU. A remote user on the guest OS can can trigger an off-by-one error while processing MODE SELECT commands in mode_sense_page() if the 'page' argument is set to MODE_PAGE_ALLS (0x3f). Successful exploitation of the vulnerability may result in QEMU crash.


Remediation

Install update from vendor's website.

References