Detections
Analytics

Linux Distros Unpatched Vulnerability : CVE-2021-20263

low Nessus Plugin ID 223628

Language:

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new 'xattrmap' option may cause the 'security.capability' xattr in the guest to not drop on file write, potentially leading to a modified, privileged executable in the guest. In rare circumstances, this flaw could be used by a malicious user to elevate their privileges within the guest. (CVE-2021-20263)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2021-20263

Plugin Details

Severity: Low

ID: 223628

File Name: unpatched_CVE_2021_20263.nasl

Version: 1.2

Type: local

Agent: unix

Family: Misc.

Published: 3/4/2025

Updated: 8/21/2025

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2021-20263

CVSS v3

Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.9

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:qemu-guest-agent, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-display-virtio-gpu-pci, p-cpe:/a:redhat:enterprise_linux:qemu-img, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-display-virtio-vga, p-cpe:/a:redhat:enterprise_linux:qemu-kvm, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-usb-redirect, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-usb-host, p-cpe:/a:redhat:enterprise_linux:qemu-pr-helper, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-display-virtio-gpu-ccw, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-display-virtio-gpu, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-display-virtio-gpu-pci-gl, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-ui-egl-headless, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-display-virtio-gpu-gl, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-block-blkio, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-device-display-virtio-vga-gl, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-tools, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-audio-pa, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-common

Required KB Items: Host/OS/identifier, Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 12/3/2020

Reference Information

CVE: CVE-2021-20263