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CVE-2024-56547

4.7 · MEDIUM

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_barr…

Published Dec 27, 2024EPSS 0.21%

Overview

CVE-2024-56547 is a medium-severity vulnerability. 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, 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/224b62028959858294789772d372dcb36cf5f820Refgit.kernel.org/stable/c/2996980e20b7a54a1869df15b3445374b850b155

How CyberStrike helps

Frequently asked questions

What is CVE-2024-56547?

CVE-2024-56547 is a medium-severity vulnerability. 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?

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-2024-56547?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-56547 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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