Resource exhaustion in Xen - CVE-2018-7540
Published: February 28, 2018 / Updated: April 2, 2018
Vulnerability identifier: #VU10780
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-7540
CWE-ID: CWE-400
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an adjacent authenticated attacker to cause a DoS condition on the target system.
The weakness exists due to non-preemptable L3/L4 pagetable freeing. An adjacent attacker can exhaust all available CPU resources and cause the service to crash.
The weakness exists due to non-preemptable L3/L4 pagetable freeing. An adjacent attacker can exhaust all available CPU resources and cause the service to crash.
Affected software
Xen
Debian Linux
Gentoo Linux
SUSE Linux
Fedora
xen (Alpine package)
xen
Debian Linux
Gentoo Linux
SUSE Linux
Fedora
xen (Alpine package)
xen
How to mitigate CVE-2018-7540
Install update from vendor's website.
xen (Alpine package) - update to 4.6.6-r4
xen - addressed in versions 4.8.3-3.fc26, 4.9.1-5.fc27
xen - addressed in versions 4.8.3-3.fc26, 4.9.1-5.fc27