SB20250916407 - Fedora 43 update for xen
Published: September 16, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) NULL pointer dereference (CVE-ID: CVE-2025-27466)
The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error when updating the reference TSC area. A malicious guest can perform a denial of service (DoS) attack against the hypervisor.
2) NULL pointer dereference (CVE-ID: CVE-2025-58142)
The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error by assuming the SIM page is mapped when a synthetic timer message has to be delivered. A malicious guest can perform a denial of service (DoS) attack against the hypervisor.
3) Race condition (CVE-ID: CVE-2025-58143)
The vulnerability allows a malicious guest to compromise the hypervisor.
The vulnerability exists due to a race condition in the mapping of the reference TSC page. A malicious guest can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.
4) NULL pointer dereference (CVE-ID: CVE-2025-58144)
The vulnerability allows a malicious guest to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error when mapping pages belonging to other domains. A malicious guest can perform a denial of service (DoS) attack.
Note, the vulnerability affects ARM-based systems.
5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2025-58145)
The vulnerability allows a malicious guest to gain access to sensitive information.
The vulnerability exists due to incorrect implementation of the P2M lock when obtaining page references. A malicious guest can gain access to sensitive information and escalate privileges on the hypervisor.
Note, the vulnerability affects ARM-based systems.
Remediation
Install update from vendor's website.