CVE-2020-35503

Aliases:UBUNTU-CVE-2020-35503DEBIAN-CVE-2020-35503
Advisory lineage Upstream: 0 Downstream: 14
Modified
Published: 02 Jun 2021, 13:22
Last modified:04 Aug 2024, 17:02

Vulnerability Summary

Overall Risk (default)
low
24/100
CVSS Score
6 MEDIUM
v3.1 (nvd)
EPSS Score
0.27% LOW
0% probability +0.25%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

02 Jun 2021, 13:22
Published
Vulnerability first disclosed
04 Aug 2024, 17:02
Last Modified
Vulnerability information updated

Description

A NULL pointer dereference flaw was found in the megasas-gen2 SCSI host bus adapter emulation of QEMU in versions before and including 6.0. This issue occurs in the megasas_command_cancelled() callback function while dropping a SCSI request. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
  • v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.27%• Percentile: 20%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • debian•qemu

    all | all | all | all

  • ubuntu•qemu

    all | all | all | all | all

  • ubuntu•qemu-hwe

    all

  • fedoraproject•fedora

    33

  • qemu•qemu

    ≤ 6.0.0

References (6)