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CVE-2024-49926

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb() For kernels built with CONFIG_FORCE_NR_CPUS=y…

Published Oct 21, 2024EPSS 0.24%

Overview

CVE-2024-49926 is a medium-severity vulnerability. It was published on October 21, 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:

rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()

For kernels built with CONFIG_FORCE_NR_CPUS=y, the nr_cpu_ids is

defined as NR_CPUS instead of the number of possible cpus, this

will cause the following system panic:

smpboot: Allowing 4 CPUs, 0 hotplug CPUs

...

setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1

...

BUG: unable to handle page fault for address: ffffffff9911c8c8

Oops: 0000 [#1] PREEMPT SMP PTI

CPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: G W

6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6

RIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0

RSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082

CR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0

Call Trace:

<TASK>

? __die+0x23/0x80

? page_fault_oops+0xa4/0x180

? exc_page_fault+0x152/0x180

? asm_exc_page_fault+0x26/0x40

? rcu_tasks_need_gpcb+0x25d/0x2c0

? __pfx_rcu_tasks_kthread+0x40/0x40

rcu_tasks_o

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/05095271a4fb0f6497121a057f9a2edf386d5d96Refgit.kernel.org/stable/c/3104bddc666ff64b90491868bbc4c7ebdd90aedfRefgit.kernel.org/stable/c/b3b2431ed27f4ebc28e26cdf005c1de42dc60bdfRefgit.kernel.org/stable/c/fd70e9f1d85f5323096ad313ba73f5fe3d15ea41

How CyberStrike helps

Frequently asked questions

What is CVE-2024-49926?

CVE-2024-49926 is a medium-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-49926?

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-2024-49926?

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-2024-49926?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-49926 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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