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
Information
Published : 2019-12-11 10:16
Updated : 2020-01-03 14:15
NVD link : CVE-2019-19581
Mitre link : CVE-2019-19581
JSON object : View
CWE
CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
Products Affected
xen
- xen
fedoraproject
- fedora