Detections
Analytics
CVE-2019-19581
medium
Description
An issue was discovered in Xen through 4.12.x allowing 32-bit Arm guest OS users to cause a denial of service (out-of-bounds access) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On 32-bit Arm accesses to bitmaps with bit a count which is a multiple of 32, an out of bounds access may occur. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. 32-bit Arm systems are vulnerable. 64-bit Arm systems are not vulnerable.
References
https://xenbits.xen.org/xsa/advisory-307.html
https://www.debian.org/security/2020/dsa-4602
https://security.gentoo.org/glsa/202003-56
https://seclists.org/bugtraq/2020/Jan/21
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00011.html