Vulnerability · Published Dec 15, 2020 · Assigned by mitre
CVE-2020-29570
Medium 6.2
In plain English
A medium-severity security flaw in the xen package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.2Medium
Exploit odds (30 days)0.4%top 67.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.14.1-r0 | ALPINE-CVE-2020-29570 |
| Alpine:v3.21 | xen | 4.14.1-r0 | ALPINE-CVE-2020-29570 |
| Alpine:v3.22 | xen | 4.14.1-r0 | ALPINE-CVE-2020-29570 |
| Alpine:v3.23 | xen | 4.14.1-r0 | ALPINE-CVE-2020-29570 |
| Alpine:v3.24 | xen | 4.14.1-r0 | ALPINE-CVE-2020-29570 |
| Debian:12 | xen | 4.14.0+88-g1d1d1f5391-1 | DEBIAN-CVE-2020-29570 |
| Debian:13 | xen | 4.14.0+88-g1d1d1f5391-1 | DEBIAN-CVE-2020-29570 |
| Debian:14 | xen | 4.14.0+88-g1d1d1f5391-1 | DEBIAN-CVE-2020-29570 |
Affected products (as reported)
References
- https://xenbits.xenproject.org/xsa/advisory-358.html x_refsource_MISC
- DSA-4812 vendor-advisory, x_refsource_DEBIAN
- [oss-security] 20201216 Xen Security Advisory 358 v5 (CVE-2020-29570) - FIFO event channels control block related ordering mailing-list, x_refsource_MLIST
- FEDORA-2020-64859a826b vendor-advisory, x_refsource_FEDORA
- FEDORA-2020-df772b417b vendor-advisory, x_refsource_FEDORA
- GLSA-202107-30 vendor-advisory, x_refsource_GENTOO