Riskcovery

CVE-2026-45952

eth: fbnic: Add validation for MTU changes

State
Published
Severity
Not scored
Published
May 27, 2026
Updated
May 27, 2026
Reserved
May 13, 2026

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 1b0a3950dbd4fa278dc33401a4faba2a23307a16 to before d7eaa006c0444a5d4671be7efe6dbb33ef8b515eAffected
  • 1b0a3950dbd4fa278dc33401a4faba2a23307a16 to before 03399063aa0c67fd8bdfd69467ddb849bb3b97dfAffected
  • 1b0a3950dbd4fa278dc33401a4faba2a23307a16 to before ccd8e87748ad083047d6c8544c5809b7f96cc8dfAffected
LinuxLinux
  • 6.18Affected
  • before 6.18Not affected
  • 6.18.14 through 6.18.*Not affected
  • 6.19.4 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.