xen: guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be...
CVE-2021-28706 is fixed in xen on 1 platform, first by DEBIAN-CVE-2021-28706, released November 24, 2021. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| xen · Debian 12.15 (bookworm) | 4.14.3+32-g9de3671772-1 | DEBIAN-CVE-2021-28706 | Nov 24, 2021 |
| xen · Debian 13.5 (trixie) | 4.14.3+32-g9de3671772-1 | DEBIAN-CVE-2021-28706 | Nov 24, 2021 |
| xen · Debian 14 | 4.14.3+32-g9de3671772-1 | DEBIAN-CVE-2021-28706 | Nov 24, 2021 |
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