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CVE-2021-47379

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd KASAN reports a use-after-free report when doing fuzz test…

Published May 21, 2024CWE-416EPSS 0.25%

Overview

CVE-2021-47379 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd

KASAN reports a use-after-free report when doing fuzz test:

[693354.104835] ==================================================================

[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160

[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338

[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147

[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018

[693354.105612] Call Trace:

[693354.105621] dump_stack+0xf1/0x19b

[693354.105626] ? show_regs_print_info+0x5/0x5

[693354.105634] ? printk+0x9c/0xc3

[693354.105638] ? cpumask_weight+0x1f/0x1f

[693354.105648] print_address_description+0x70/0x360

[693354.105654] kasan_report+0x1b2/0x330

[693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160

[693354.105665] ? bfq_io_set_weight_legacy+0xd3/0

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fbRefgit.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2Refgit.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08Refgit.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdfRefgit.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fbRefgit.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2Refgit.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08Refgit.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47379?

CVE-2021-47379 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47379?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47379?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47379?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47379 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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