CVE-2025-39758
A bug in the Linux kernel’s RDMA/siw module caused the system to send too many bytes over the network, potentially leading to crashes. The issue has been fixed in a recent kernel update. Users should update their kernel to the latest version to avoid the problem.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel (RDMA/siw module) – all systems running affected kernel versions.
Real-world impact
An attacker could send crafted network traffic that triggers the bug, causing the kernel to crash and resulting in a denial‑of‑service for the affected system.
Why this severity
The CVSS score of 9.8 reflects the high impact of the bug: it can affect confidentiality, integrity, and availability with no authentication required, and it is exploitable over the network.
What to do about it
- 01Upgrade the Linux kernel to a version that includes the fix (commit c2ff29e99a76 or later).
NVD-referenced vendor advisory
Timeline
- Sep 11, 2025 · Sep 11, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Jul 30, 2026 · 6d 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.