VDB
ALPINE-CVE-2021-26933
ALPINE-CVE-2021-26933
PUBLISHED
CVSS 5.5 MEDIUM
An issue was discovered in Xen 4.9 through 4.14.x. On Arm, a guest is allowed to control whether memory accesses are bypassing the cache. This means that Xen needs to ensure that all writes (such as the ones during scrubbing) have reached the memory before handing over the page to a guest. Unfortunately, the operation to clean the cache is happening before checking if the page was scrubbed. Therefore there is no guarantee when all the writes will reach the memory.
Risk Scores
CVSS v3.1
5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.16 | xen | 4.4.1-r3, 4.4.1-r4, 4.4.1-r5 |
| Alpine:v3.23 | xen | 4.2.0-r2, 4.2.0-r1, 4.2.0-r0 |
| Alpine:v3.15 | xen | 4.1.2-r8, 4.1.2-r9, 4.1.3-r0 |
| Alpine:v3.11 | xen | 4.2.1-r9, 4.9.1-r3, 4.9.1-r2 |
| Alpine:v3.20 | xen | 4.0.1-r0, 4.0.1-r1, 4.0.1-r2 |
| Alpine:v3.18 | xen | 4.8.1-r1, 4.0.1-r0, 4.0.1-r3 |
| Alpine:v3.21 | xen | 4.8.1-r4, 4.8.1-r3, 4.8.1-r2 |
| Alpine:v3.13 | xen | 4.3.2-r4, 4.9.1-r3, 4.9.1-r2 |
| Alpine:v3.22 | xen | 4.1.1-r1, 0, 4.0.1-r0 |
| Alpine:v3.19 | xen | 0, 4.9.1-r3, 4.9.1-r2 |
| Alpine:v3.17 | xen | 0, 4.0.1-r2, 4.0.1-r3 |
| Alpine:v3.14 | xen | 4.10.0-r0, 4.0.1-r1, 4.0.1-r2 |
| Alpine:v3.12 | xen | 4.6.0-r0, 4.5.1-r3, 4.5.1-r2 |
Timeline
- Feb 17, 2021 CVE Published
- Dec 3, 2025 CVE Updated
- Apr 30, 2026 Distribution Patch