7.8

CVE-2021-28709: debian debian_linux

CVSS: 7.8v3.1HighModified
AliasesALPINE-CVE-2021-28709UBUNTU-CVE-2021-28709DEBIAN-CVE-2021-28709
Published 24-11-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-28709 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 11
DSA-5017-1OPENSUSE-SU-2021:1543-1OPENSUSE-SU-2021:3968-1SUSE-SU-2021:14848-1SUSE-SU-2021:3813-1SUSE-SU-2021:3842-1

Timeline

  1. 24-11-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

issues with partially successful P2M updates on x86 T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] x86 HVM and PVH guests may be started in populate-on-demand (PoD) mode, to provide a way for them to later easily have more memory assigned. Guests are permitted to control certain P2M aspects of individual pages via hypercalls. These hypercalls may act on ranges of pages specified via page orders (resulting in a power-of-2 number of pages). In some cases the hypervisor carries out the requests by splitting them into smaller chunks. Error handling in certain PoD cases has been insufficient in that in particular partial success of some operations was not properly accounted for. There are two code paths affected - page removal (CVE-2021-28705) and insertion of new pages (CVE-2021-28709). (We provide one patch which combines the fix to both issues.)

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

0.00 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
Alpine1 product
  • xen≥ 3.4.0, < 4.14.3-r2 | ≥ 3.4.0, < 4.15.1-r2
Fedoraproject1 product
Ubuntu1 product
  • xenAll versions (No fix recorded)
Xen1 product
  • xen≥ 4.14.0, < 4.15.0 | ≥ 4.12.0, < 4.13.0 | ≥ 4.15.0, < 4.16.0 | xen-unstable | ≥ 4.13.0, < 4.14.0 | ≥ 3.4.0, ≤ 4.12.4 | ≥ 4.13.0, ≤ 4.13.4 | ≥ 4.14.0, ≤ 4.14.3 | 4.15.0 | 4.15.1

5 vendors · 6 products

References

10 links