Vulnerability · Published Oct 22, 2020 · Assigned by mitre
CVE-2020-27674
Medium 5.3
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 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.3Medium
Exploit odds (30 days)0.4%top 70.4% 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 allowing x86 PV guest OS users to gain guest OS privileges by modifying kernel memory contents, because invalidation of TLB entries is mishandled during use of an INVLPG-like attack technique.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.14.0-r2 | ALPINE-CVE-2020-27674 |
| Alpine:v3.21 | xen | 4.14.0-r2 | ALPINE-CVE-2020-27674 |
| Alpine:v3.22 | xen | 4.14.0-r2 | ALPINE-CVE-2020-27674 |
| Alpine:v3.23 | xen | 4.14.0-r2 | ALPINE-CVE-2020-27674 |
| Alpine:v3.24 | xen | 4.14.0-r2 | ALPINE-CVE-2020-27674 |
| Debian:12 | xen | 4.14.0+80-gd101b417b7-1 | DEBIAN-CVE-2020-27674 |
| Debian:13 | xen | 4.14.0+80-gd101b417b7-1 | DEBIAN-CVE-2020-27674 |
| Debian:14 | xen | 4.14.0+80-gd101b417b7-1 | DEBIAN-CVE-2020-27674 |
Affected products (as reported)
References
- https://xenbits.xen.org/xsa/advisory-286.html x_refsource_MISC
- GLSA-202011-06 vendor-advisory, x_refsource_GENTOO
- FEDORA-2020-5398bfb466 vendor-advisory, x_refsource_FEDORA
- FEDORA-2020-ec84c1565b vendor-advisory, x_refsource_FEDORA
- FEDORA-2020-6dd36a716c vendor-advisory, x_refsource_FEDORA
- DSA-4804 vendor-advisory, x_refsource_DEBIAN
- [oss-security] 20210119 Xen Security Advisory 286 v6 (CVE-2020-27674) - x86 PV guest INVLPG-like flushes may leave stale TLB entries mailing-list, x_refsource_MLIST