Critical· 9.8official fix available
CVE-2025-38439
A bug in the Linux kernel's bnxt_en driver causes it to incorrectly set the DMA unmap length when transmitting XDP_REDIRECT packets. This error triggers a system warning when IOMMU is enabled.
publishedJul 25, 2025
last modifiedJul 30, 2026
sourcesNVD
severity · cvss
9.8
critical · how bad it is
exploitation · epss
<1%
39th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 29, 2026
An official fix is available, so this entry is kept for 30 days and then removed automatically.
01
Who is affected
Users running the Linux kernel (specifically version 6.16 and Debian 11.0) that utilize the bnxt_en driver with IOMMU enabled.
02
Real-world impact
An attacker could potentially exploit this driver error to cause system instability or warnings on systems using IOMMU.
03
Why this severity
The critical score reflects that this is a network-accessible issue that can impact the confidentiality, integrity, and availability of the system.
04
What to do about it
official fix available
recommended steps
- 01Update the Linux kernel to a version that includes the fix for the bnxt_en driver.
NVD-referenced vendor advisory
05
Timeline
- Jul 25, 2025 · Jul 25, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Jul 30, 2026 · 7d agoAdvisory updatedThe NVD record was last revised.
- Jul 30, 2026 · 6d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
06
How it’s attacked
Attack vectorNetwork (remote)
Attack complexityLow
Privileges requiredNone
User interactionNone needed
ScopeUnchanged
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
07
References & advisories
- git.kernel.org/stable/c/16ae306602163fcb7a…patch
- git.kernel.org/stable/c/3cdf199d4755d47797…patch
- git.kernel.org/stable/c/50dad9909715094e7d…patch
- git.kernel.org/stable/c/5909679a82cd74cf03…patch
- git.kernel.org/stable/c/8d672a1a6bfc81fef9…patch
- git.kernel.org/stable/c/e260f4d49370c85a47…patch
- git.kernel.org/stable/c/f154e41e1d9d15ab21…patch
- git.kernel.org/stable/c/f9eaf6d036075dc820…patch
- lists.debian.org/debian-lts-announce/2025/10…third party advisory
- lists.debian.org/debian-lts-announce/2025/10…third party advisory
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →