CVE-2021-28706
8.6
HIGH
CVSS 3.1
EPSS 0.15%
Description
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound.
How to fix CVE-2021-28706
To remediate CVE-2021-28706, upgrade the affected package to a fixed version below.
- —upgrade to 4.13.4-r2 or later
- —upgrade to 4.14.3+32-g9de3671772-1~deb11u1 or later
Is CVE-2021-28706 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 4.13.4-r2
- from 0, < 4.14.3+32-g9de3671772-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |