Resource management error in Xen - CVE-2020-25598
Published: September 23, 2020
Vulnerability identifier: #VU46969
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H]
CVE-ID: CVE-2020-25598
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to missing unlock in XENMEM_acquire_resource error path in Xen. A malicious HVM stubdomain can cause an RCU reference to be leaked. This causes subsequent administration operations, (e.g. CPU offline) to livelock, resulting in a host denial of service.
The vulnerability only affects VMs using HVM stubdomains.
Affected software
Xen
Gentoo Linux
Opensuse
Fedora
xen (Alpine package)
xen
app-emulation/xen
app-emulation/xen-tools
Gentoo Linux
Opensuse
Fedora
xen (Alpine package)
xen
app-emulation/xen
app-emulation/xen-tools
How to mitigate CVE-2020-25598
Install updates from vendor's website.
xen (Alpine package) - update to 4.14.0-r1
xen - addressed in versions 4.12.3-5.fc31, 4.13.1-6.fc32, 4.14.0-5.fc33
app-emulation/xen - update to 4.13.2
app-emulation/xen-tools - update to 4.13.2
xen - addressed in versions 4.12.3-5.fc31, 4.13.1-6.fc32, 4.14.0-5.fc33
app-emulation/xen - update to 4.13.2
app-emulation/xen-tools - update to 4.13.2