5.5

CVE-2021-3308: fedoraproject fedora

CVSS: 5.5v3.1MediumModified
AliasesALPINE-CVE-2021-3308UBUNTU-CVE-2021-3308DEBIAN-CVE-2021-3308
Published 26-01-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-3308 is a medium (CVSS 5.5) vulnerability in fedoraproject fedora. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 35% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.42%
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 4 · Related 4
SUSE-SU-2021:1023-1SUSE-SU-2021:1028-1SUSE-SU-2021:1460-1SUSE-SU-2021:2955-1

Timeline

  1. 26-01-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Xen 4.12.3 through 4.12.4 and 4.13.1 through 4.14.x. An x86 HVM guest with PCI pass through devices can force the allocation of all IDT vectors on the system by rebooting itself with MSI or MSI-X capabilities enabled and entries setup. Such reboots will leak any vectors used by the MSI(-X) entries that the guest might had enabled, and hence will lead to vector exhaustion on the system, not allowing further PCI pass through devices to work properly. HVM guests with PCI pass through devices can mount a Denial of Service (DoS) attack affecting the pass through of PCI devices to other guests or the hardware domain. In the latter case, this would affect the entire host.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

35%

Versus all other CVEs

30-day change

0.00 pp

From 0.42% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.42%

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

No weakness data has been published for this record.

Affected systems

Alpine1 product
  • xen≥ 4.13.1, < 4.13.2-r4 | ≥ 4.13.1, < 4.14.1-r1 | ≥ 4.13.1, < 4.14.1-r2
Debian1 product
  • xen< 4.14.1+11-gb0b734a8b3-1
Fedoraproject1 product
Ubuntu1 product
  • xen< 4.6.5-0ubuntu1.4 | < 4.9.2-0ubuntu1 | < 4.11.3+24-g14b62ab3e5-1ubuntu2
Xen1 product
  • xen≥ 4.13.1, ≤ 4.14.1 | 4.12.3 | 4.12.4

5 vendors · 5 products

References

9 links