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CVE-2024-38667

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: riscv: prevent pt_regs corruption for secondary idle threads Top of the kernel thread stack should be reserved for pt_regs.

Published Jun 24, 2024CWE-787EPSS 0.23%

Overview

CVE-2024-38667 is a high-severity vulnerability. It was published on June 24, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

riscv: prevent pt_regs corruption for secondary idle threads

Top of the kernel thread stack should be reserved for pt_regs. However

this is not the case for the idle threads of the secondary boot harts.

Their stacks overlap with their pt_regs, so both may get corrupted.

Similar issue has been fixed for the primary hart, see c7cdd96eca28

("riscv: prevent stack corruption by reserving task_pt_regs(p) early").

However that fix was not propagated to the secondary harts. The problem

has been noticed in some CPU hotplug tests with V enabled. The function

smp_callin stored several registers on stack, corrupting top of pt_regs

structure including status field. As a result, kernel attempted to save

or restore inexistent V context.

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/0c1f28c32a194303da630fca89481334b9547b80Refgit.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44Refgit.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4afRefgit.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9eRefgit.kernel.org/stable/c/0c1f28c32a194303da630fca89481334b9547b80Refgit.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44Refgit.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4afRefgit.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e

How CyberStrike helps

Frequently asked questions

What is CVE-2024-38667?

CVE-2024-38667 is a high-severity vulnerability. It was published on June 24, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-38667?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-38667?

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-2024-38667?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-38667 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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