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CVE-2025-22048

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Don't override subprog's return value The verifier test `calls: div by 0 in subprog` triggers a panic at the ld…

Published Apr 16, 2025EPSS 0.21%

Overview

CVE-2025-22048 is a high-severity vulnerability. It was published on April 16, 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:

LoongArch: BPF: Don't override subprog's return value

The verifier test `calls: div by 0 in subprog` triggers a panic at the

ld.bu instruction. The ld.bu insn is trying to load byte from memory

address returned by the subprog. The subprog actually set the correct

address at the a5 register (dedicated register for BPF return values).

But at commit 73c359d1d356 ("LoongArch: BPF: Sign-extend return values")

we also sign extended a5 to the a0 register (return value in LoongArch).

For function call insn, we later propagate the a0 register back to a5

register. This is right for native calls but wrong for bpf2bpf calls

which expect zero-extended return value in a5 register. So only move a0

to a5 for native calls (i.e. non-BPF_PSEUDO_CALL).

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/223d565d8892481684091cfbaf3466f2b0e289d3Refgit.kernel.org/stable/c/60f3caff1492e5b8616b9578c4bedb5c0a88ed14Refgit.kernel.org/stable/c/780628a780b622759d9e5adc76d15432144da1a3Refgit.kernel.org/stable/c/7df2696256a034405d3c5a71b3a4c54725de4404Refgit.kernel.org/stable/c/996e90ab446641553e8e21707b38b9709605e0e0

How CyberStrike helps

Frequently asked questions

What is CVE-2025-22048?

CVE-2025-22048 is a high-severity vulnerability. It was published on April 16, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-22048?

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-2025-22048?

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-2025-22048?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-22048 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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