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CVE-2021-47536

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net/smc: fix wrong list_del in smc_lgr_cleanup_early smc_lgr_cleanup_early() meant to delete the link group from the link group…

Published May 24, 2024CWE-787EPSS 0.59%

Overview

CVE-2021-47536 is a critical-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

net/smc: fix wrong list_del in smc_lgr_cleanup_early

smc_lgr_cleanup_early() meant to delete the link

group from the link group list, but it deleted

the list head by mistake.

This may cause memory corruption since we didn't

remove the real link group from the list and later

memseted the link group structure.

We got a list corruption panic when testing:

[  231.277259] list_del corruption. prev->next should be ffff8881398a8000, but was 0000000000000000

[  231.278222] ------------[ cut here ]------------

[  231.278726] kernel BUG at lib/list_debug.c:53!

[  231.279326] invalid opcode: 0000 [#1] SMP NOPTI

[  231.279803] CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.10.46+ #435

[  231.280466] Hardware name: Alibaba Cloud ECS, BIOS 8c24b4c 04/01/2014

[  231.281248] Workqueue: events smc_link_down_work

[  231.281732] RIP: 0010:__list_del_entry_valid+0x70/0x90

[  231.282258] Code: 4c 60 82 e8 7d cc 6a 00 0f 0b 48 89 fe 48 c

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/77731fede297a23d26f2d169b4269466b2c82529Refgit.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0baRefgit.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66cRefgit.kernel.org/stable/c/77731fede297a23d26f2d169b4269466b2c82529Refgit.kernel.org/stable/c/789b6cc2a5f9123b9c549b886fdc47c865cfe0baRefgit.kernel.org/stable/c/95518fe354d712dca6f431cf2a11b8f63bc9a66c

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47536?

CVE-2021-47536 is a critical-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2021-47536?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47536?

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-2021-47536?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47536 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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