CVE-2018-15469: Medium severity XEN Xen vulnerability
An issue was discovered in Xen through 4.11.x. ARM never properly implemented grant table v2, either in the hypervisor or in Linux. Unfortunately, an ARM guest can still request v2 grant tables; they will simply not be properly set up, resulting in subsequent grant-related hypercalls hitting BUG() checks. An unprivileged guest can cause a BUG() check in the hypervisor, resulting in a denial-of-service (crash).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/xento a version that resolves this vulnerability.Fixed in 4.17.5+72-g01140da4e8-1Fixed in 4.17.7-0+deb12u1Fixed in 4.20.3+127-gc42374a105-0+deb13u1Fixed in 4.20.4+39-gf1e1321c87-0+deb13u1Fixed in 4.20.4+39-gf1e1321c87-1
Event History
Frequently Asked Questions
What is the severity of CVE-2018-15469?
CVE-2018-15469 has been rated as high severity due to the potential for denial of service in affected environments.
How do I fix CVE-2018-15469?
To fix CVE-2018-15469, update to a version of Xen later than 4.11.0 that addresses this vulnerability.
Which systems are affected by CVE-2018-15469?
CVE-2018-15469 affects Xen versions up to and including 4.11.0, as well as Debian Linux version 8.0.
What types of attacks can exploit CVE-2018-15469?
CVE-2018-15469 can be exploited by ARM guest systems making improper requests for grant table v2.
Is there a workaround for CVE-2018-15469?
The recommended action is to apply the appropriate patches, as there are no effective workarounds that fully mitigate the risks associated with CVE-2018-15469.