SB2018062723 - Fedora 27 update for xen
Published: June 27, 2018 Updated: April 24, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Denial of service (CVE-ID: CVE-2018-12891)
The vulnerability allows an adjacent attacker to cause DoS condition on the target system.
The vulnerability exists on x86 systems due to unspecified flaw. An adjacent attacker can invoke certain PV MMU operations to preempt the current vCPU, prevent use of a physical CPU and cause the system to crash.
2) Denial of service (CVE-ID: CVE-2018-12893)
The vulnerability allows an adjacent attacker to cause DoS condition on the target system.
The vulnerability exists on x86 systems due to unspecified flaw. An adjacent attacker can invoke hardware debugging facilities, trigger a debug exception and cause the system to crash.
3) Security restrictions bypass (CVE-ID: CVE-2018-12892)
The vulnerability allows an adjacent attacker with administrative privileges to bypass security restrictions on the target system.
The vulnerability exists on x86 systems due to a flaw in libxl. An adjacent attacker can bypass the read-only restrictions on a SCSI disk image in certain cases.
4) Side-channel attack (CVE-ID: CVE-2018-3665)
The vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists due to utilizing the Lazy FP state restore technique for floating point state when context switching between application processes. A local attacker can conduct cache side-channel attacks and determine register values of other processes.
Note: This vulnerability is known as LazyFP.
Remediation
Install update from vendor's website.