CVE-2020-27672

Advisory lineage Upstream: 0 Downstream: 21
Modified
Published: 22 Oct 2020, 20:33
Last modified:04 Aug 2024, 16:18

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7 HIGH
v3.1 (nvd)
EPSS Score
0.04% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 Oct 2020, 20:33
Published
Vulnerability first disclosed
04 Aug 2024, 16:18
Last Modified
Vulnerability information updated

Description

An issue was discovered in Xen through 4.14.x allowing x86 guest OS users to cause a host OS denial of service, achieve data corruption, or possibly gain privileges by exploiting a race condition that leads to a use-after-free involving 2MiB and 1GiB superpages.

CVSS Metrics

  • v3.1•HIGH•Score: 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  • v2.0•MEDIUM•Score: 6.9AV:L/AC:M/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 0.04%• Percentile: 12%

Techniques & Countermeasures

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • debian•debian_linux

    10.0

  • fedoraproject•fedora

    31

  • opensuse•leap

    15.1 | 15.2

  • xen•xen

    ≥ 3.2.0, ≤ 4.14.0

References (8)