An issue was discovered in Xen through 4.14.x. A bounds check common to most operation time functions specific to FIFO event channels depends on the CPU observing consistent state. While the producer side uses appropriately ordered writes, the consumer side isn't protected against re-ordered reads, and may hence end up de-referencing a NULL pointer. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. Only Arm systems may be vulnerable. Whether a system is vulnerable depends on the specific CPU. x86 systems are not vulnerable.
References
Configurations
History
10 Dec 2021, 01:57
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Information
Published : 2020-12-15 17:15
Updated : 2024-02-04 21:23
NVD link : CVE-2020-29571
Mitre link : CVE-2020-29571
CVE.ORG link : CVE-2020-29571
JSON object : View
Products Affected
xen
- xen
debian
- debian_linux
fedoraproject
- fedora
CWE
CWE-476
NULL Pointer Dereference