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CVE-2025-38586

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fix fp initialization for exception boundary In the ARM64 BPF JIT when prog->aux->exception_boundary is set for a B…

Published Aug 19, 2025CWE-476EPSS 0.17%

Overview

CVE-2025-38586 is a high-severity vulnerability. It was published on August 19, 2025 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:

bpf, arm64: Fix fp initialization for exception boundary

In the ARM64 BPF JIT when prog->aux->exception_boundary is set for a BPF

program, find_used_callee_regs() is not called because for a program

acting as exception boundary, all callee saved registers are saved.

find_used_callee_regs() sets `ctx->fp_used = true;` when it sees FP

being used in any of the instructions.

For programs acting as exception boundary, ctx->fp_used remains false

even if frame pointer is used by the program and therefore, FP is not

set-up for such programs in the prologue. This can cause the kernel to

crash due to a pagefault.

Fix it by setting ctx->fp_used = true for exception boundary programs as

fp is always saved in such programs.

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/0dbef493cae7d451f740558665893c000adb2321Refgit.kernel.org/stable/c/1ce30231e0a2c8c361ee5f8f7f265fc17130adceRefgit.kernel.org/stable/c/b114fcee766d5101eada1aca7bb5fd0a86c89b35Refgit.kernel.org/stable/c/e23184725dbb72d5d02940222eee36dbba2aa422

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38586?

CVE-2025-38586 is a high-severity vulnerability. It was published on August 19, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38586?

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-2025-38586?

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-2025-38586?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38586 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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