CVE-2026-45952

MEDIUM EPSS 2.6%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 2

VendorProductVersionRange
linuxlinux_kernel*≥6.18  –  <6.18.14
linuxlinux_kernel*≥6.19  –  <6.19.4

References 3

  • git.kernel.org https://git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97df
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8df
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515e
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97df
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8df
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515e
    Patch