UBUNTU-CVE-2020-29571
See a problem?- Source
- https://ubuntu.com/security/notices/UBUNTU-CVE-2020-29571
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-29571.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-29571
- Related
- Published
- 2020-12-15T17:15:00Z
- Modified
- 2020-12-15T17:15:00Z
- Severity
-
- 6.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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
Affected packages
Ubuntu:Pro:16.04:LTS / xen
Package
- Name
- xen
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Ubuntu:Pro:18.04:LTS / xen
Package
- Name
- xen
Ubuntu:20.04:LTS / xen
Package
- Name
- xen
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected