Vulnerability · Published Jun 30, 2021 · Assigned by XEN
CVE-2021-28693
Medium 5.5
In plain English
A medium-severity security flaw in xen from Xen. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.3%top 74.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
xen/arm: Boot modules are not scrubbed The bootloader will load boot modules (e.g. kernel, initramfs...) in a temporary area before they are copied by Xen to each domain memory. To ensure sensitive data is not leaked from the modules, Xen must "scrub" them before handing the page over to the allocator. Unfortunately, it was discovered that modules will not be scrubbed on Arm.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | xen | 4.15.0-r1 | ALPINE-CVE-2021-28693 |
| Alpine:v3.21 | xen | 4.15.0-r1 | ALPINE-CVE-2021-28693 |
| Alpine:v3.22 | xen | 4.15.0-r1 | ALPINE-CVE-2021-28693 |
| Alpine:v3.23 | xen | 4.15.0-r1 | ALPINE-CVE-2021-28693 |
| Alpine:v3.24 | xen | 4.15.0-r1 | ALPINE-CVE-2021-28693 |
| Debian:12 | xen | 4.14.2+25-gb6a8c4f72d-1 | DEBIAN-CVE-2021-28693 |
| Debian:13 | xen | 4.14.2+25-gb6a8c4f72d-1 | DEBIAN-CVE-2021-28693 |
| Debian:14 | xen | 4.14.2+25-gb6a8c4f72d-1 | DEBIAN-CVE-2021-28693 |
| Ubuntu:22.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-28693 |
| Ubuntu:24.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-28693 |
| Ubuntu:25.10 | xen | no fix listed | UBUNTU-CVE-2021-28693 |
| Ubuntu:26.04:LTS | xen | no fix listed | UBUNTU-CVE-2021-28693 |
| Ubuntu:26.10 | xen | no fix listed | UBUNTU-CVE-2021-28693 |
Affected products (as reported)
References
- https://xenbits.xenproject.org/xsa/advisory-372.txt x_refsource_MISC
- GLSA-202107-30 vendor-advisory, x_refsource_GENTOO