Linux Distros Unpatched Vulnerability : CVE-2021-47646

high Nessus Plugin ID 229800

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.

- In the Linux kernel, the following vulnerability has been resolved: Revert Revert block, bfq: honor already-setup queue merges A crash [1] happened to be triggered in conjunction with commit 2d52c58b9c9b (block, bfq: honor already-setup queue merges). The latter was then reverted by commit ebc69e897e17 (Revert block, bfq: honor already-setup queue merges). Yet, the reverted commit was not the one introducing the bug. In fact, it actually triggered a UAF introduced by a different commit, and now fixed by commit d29bd41428cf (block, bfq: reset last_bfqq_created on group change). So, there is no point in keeping commit 2d52c58b9c9b (block, bfq: honor already-setup queue merges) out. This commit restores it.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=214503 (CVE-2021-47646)

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

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 229800

File Name: unpatched_CVE_2021_47646.nasl

Version: 1.1

Type: local

Agent: unix

Family: Misc.

Published: 3/5/2025

Updated: 3/5/2025

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

CVSS Score Source: CVE-2021-47646

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

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

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 2/26/2025

Reference Information

CVE: CVE-2021-47646

Detections

Analytics