CVE-2024-56621

5.5 · MEDIUM

Published Dec 27, 2024 linux CWE-476 EPSS 0.20% (10th pctl) CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Overview

CVE-2024-56621 is a medium-severity vulnerability affecting linux linux_kernel. It was published on December 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

scsi: ufs: core: Cancel RTC work during ufshcd_remove()

Currently, RTC work is only cancelled during __ufshcd_wl_suspend(). When

ufshcd is removed in ufshcd_remove(), RTC work is not cancelled. Due to

this, any further trigger of the RTC work after ufshcd_remove() would

result in a NULL pointer dereference as below:

Unable to handle kernel NULL pointer dereference at virtual address 00000000000002a4

Workqueue: events ufshcd_rtc_work

Call trace:

_raw_spin_lock_irqsave+0x34/0x8c

pm_runtime_get_if_active+0x24/0xb4

ufshcd_rtc_work+0x124/0x19c

process_scheduled_works+0x18c/0x2d8

worker_thread+0x144/0x280

kthread+0x11c/0x128

ret_from_fork+0x10/0x20

Since RTC work accesses the ufshcd internal structures, it should be cancelled

when ufshcd is removed. So do that in ufshcd_remove(), as per the order in

ufshcd_init().

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

Vendor	Product	Versions	Status
linux	linux_kernel	>= 6.8, < 6.12.5	Affected

References

Ref git.kernel.org/stable/c/1695c4361d35b7bdadd7b34f99c9c07741e181e5 Ref git.kernel.org/stable/c/2e7a3bb0331efb292e0fb022c36bc592137f0520 Ref git.kernel.org/stable/c/57479e37d3f69efee2f0678568274db773284bc8

Frequently Asked Questions

What is CVE-2024-56621?

CVE-2024-56621 is a medium-severity vulnerability affecting linux linux_kernel. It was published on December 27, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-56621?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-56621?

How can CyberStrike help with CVE-2024-56621?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-56621 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

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