Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: Add validation for MTU changes Increasing the MTU beyond the HDS threshold causes the hardware to fragment packets across multiple buffers. If a single-buffer XDP program is attached, the driver will drop all multi-frag frames. While we can't prevent a remote sender from sending non-TCP packets larger than the MTU, this will prevent users from inadvertently breaking new TCP streams. Traditionally, drivers supported XDP with MTU less than 4Kb (packet per page). Fbnic currently prevents attaching XDP when MTU is too high. But it does not prevent increasing MTU after XDP is attached.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.18, < 6.18.14 |
References
- https://git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97dfPatch
- https://git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8dfPatch
- https://git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515ePatch
FAQ
What is CVE-2026-45952?
CVE-2026-45952 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: Add validation for MTU changes Increasing the MTU beyond the HDS threshold causes the hardware to fragment packets acr...
How severe is CVE-2026-45952?
CVE-2026-45952 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45952?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.