SB2022072636 - Denial of service in Xen shadow mode
Published: July 26, 2022
Security Bulletin ID
SB2022072636
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2022-33745)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to an error in code responsible for migration and work around of kernels unaware of L1TF in shadow mode, related to TLB flush. A remote user with access to x86 PV guest can start the migration process to trigger the vulnerability and exhaust all available memory, resulting in a denial of service (DoS) attack.
Remediation
Install update from vendor's website.