CVE-2024-56547

4.7 · MEDIUM

Published Dec 27, 2024 linux EPSS 0.21% (11th pctl) CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Overview

CVE-2024-56547 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 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, 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:

rcu/nocb: Fix missed RCU barrier on deoffloading

Currently, running rcutorture test with torture_type=rcu fwd_progress=8

n_barrier_cbs=8 nocbs_nthreads=8 nocbs_toggle=100 onoff_interval=60

test_boost=2, will trigger the following warning:

WARNING: CPU: 19 PID: 100 at kernel/rcu/tree_nocb.h:1061 rcu_nocb_rdp_deoffload+0x292/0x2a0

RIP: 0010:rcu_nocb_rdp_deoffload+0x292/0x2a0

Call Trace:

<TASK>

? __warn+0x7e/0x120

? rcu_nocb_rdp_deoffload+0x292/0x2a0

? report_bug+0x18e/0x1a0

? handle_bug+0x3d/0x70

? exc_invalid_op+0x18/0x70

? asm_exc_invalid_op+0x1a/0x20

? rcu_nocb_rdp_deoffload+0x292/0x2a0

rcu_nocb_cpu_deoffload+0x70/0xa0

rcu_nocb_toggle+0x136/0x1c0

? __pfx_rcu_nocb_toggle+0x10/0x10

kthread+0xd1/0x100

? __pfx_kthread+0x10/0x10

ret_from_fork+0x2f/0x50

? __pfx_kthread+0x10/0x10

ret_from_fork_asm+0x1a/0x30

</TASK>

CPU0 CPU2

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	>= 6.12, < 6.12.2	Affected

References

Ref git.kernel.org/stable/c/224b62028959858294789772d372dcb36cf5f820 Ref git.kernel.org/stable/c/2996980e20b7a54a1869df15b3445374b850b155

Frequently Asked Questions

What is CVE-2024-56547?

CVE-2024-56547 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 4.7 (MEDIUM).

How severe is CVE-2024-56547?

This vulnerability has a CVSS 3.1 base score of 4.7, 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-2024-56547?

How can CyberStrike help with CVE-2024-56547?

CyberStrike's AI-powered security agents can automatically detect CVE-2024-56547 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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