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CVE-2021-47598

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: sch_cake: do not call cake_destroy() from cake_init() qdiscs are not supposed to call their own destroy() method from init(), b…

Published Jun 19, 2024CWE-416EPSS 0.26%

Overview

CVE-2021-47598 is a high-severity vulnerability. It was published on June 19, 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:

sch_cake: do not call cake_destroy() from cake_init()

qdiscs are not supposed to call their own destroy() method

from init(), because core stack already does that.

syzbot was able to trigger use after free:

DEBUG_LOCKS_WARN_ON(lock->magic != lock)

WARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock_common kernel/locking/mutex.c:586 [inline]

WARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock+0x9ec/0x12f0 kernel/locking/mutex.c:740

Modules linked in:

CPU: 0 PID: 21902 Comm: syz-executor189 Not tainted 5.16.0-rc4-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:586 [inline]

RIP: 0010:__mutex_lock+0x9ec/0x12f0 kernel/locking/mutex.c:740

Code: 08 84 d2 0f 85 19 08 00 00 8b 05 97 38 4b 04 85 c0 0f 85 27 f7 ff ff 48 c7 c6 20 00 ac 89 48 c7 c7 a0 fe ab 89 e8 bf 76 ba ff <0f> 0b e9

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/0d80462fbdcafd536dcad7569e65d3d14a7e9f2fRefgit.kernel.org/stable/c/20ad1ef02f9ad5e1dda9eeb113e4c158b4806986Refgit.kernel.org/stable/c/4e388232e630ebe4f94b4a0715ec98c0e2b314a3Refgit.kernel.org/stable/c/ab443c53916730862cec202078d36fd4008bea79Refgit.kernel.org/stable/c/f6deae2e2d83bd267e1986f5d71d8c458e18fd99Refgit.kernel.org/stable/c/0d80462fbdcafd536dcad7569e65d3d14a7e9f2fRefgit.kernel.org/stable/c/20ad1ef02f9ad5e1dda9eeb113e4c158b4806986Refgit.kernel.org/stable/c/4e388232e630ebe4f94b4a0715ec98c0e2b314a3Refgit.kernel.org/stable/c/ab443c53916730862cec202078d36fd4008bea79Refgit.kernel.org/stable/c/f6deae2e2d83bd267e1986f5d71d8c458e18fd99

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47598?

CVE-2021-47598 is a high-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47598?

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-2021-47598?

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-2021-47598?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47598 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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