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CVE-2025-38439

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: bnxt_en: Set DMA unmap len correctly for XDP_REDIRECT When transmitting an XDP_REDIRECT packet, call dma_unmap_len_set() with t…

Published Jul 25, 2025EPSS 0.54%

Overview

CVE-2025-38439 is a critical-severity vulnerability. It was published on July 25, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

bnxt_en: Set DMA unmap len correctly for XDP_REDIRECT

When transmitting an XDP_REDIRECT packet, call dma_unmap_len_set()

with the proper length instead of 0. This bug triggers this warning

on a system with IOMMU enabled:

WARNING: CPU: 36 PID: 0 at drivers/iommu/dma-iommu.c:842 __iommu_dma_unmap+0x159/0x170

RIP: 0010:__iommu_dma_unmap+0x159/0x170

Code: a8 00 00 00 00 48 c7 45 b0 00 00 00 00 48 c7 45 c8 00 00 00 00 48 c7 45 a0 ff ff ff ff 4c 89 45

b8 4c 89 45 c0 e9 77 ff ff ff <0f> 0b e9 60 ff ff ff e8 8b bf 6a 00 66 66 2e 0f 1f 84 00 00 00 00

RSP: 0018:ff22d31181150c88 EFLAGS: 00010206

RAX: 0000000000002000 RBX: 00000000e13a0000 RCX: 0000000000000000

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

RBP: ff22d31181150cf0 R08: ff22d31181150ca8 R09: 0000000000000000

R10: 0000000000000000 R11: ff22d311d36c9d80 R12: 0000000000001000

R13: ff13544d10645010 R14: ff22d31181150c90 R15: ff13544d0b2bac00

FS: 00

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/16ae306602163fcb7ae83f2701b542e43c100ceeRefgit.kernel.org/stable/c/3cdf199d4755d477972ee87110b2aebc88b3cfadRefgit.kernel.org/stable/c/50dad9909715094e7d9ca25e9e0412b875987519Refgit.kernel.org/stable/c/5909679a82cd74cf0343d9e3ddf4b6931aa7e613Refgit.kernel.org/stable/c/8d672a1a6bfc81fef9151925c9c0481f4acf4becRefgit.kernel.org/stable/c/e260f4d49370c85a4701d43c6d16b8c39f8b605fRefgit.kernel.org/stable/c/f154e41e1d9d15ab21300ba7bbf0ebb5cb3b9c2aRefgit.kernel.org/stable/c/f9eaf6d036075dc820520e1194692c0619b7297bReflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38439?

CVE-2025-38439 is a critical-severity vulnerability. It was published on July 25, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-38439?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-38439?

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-2025-38439?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38439 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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