eth: fbnic: Add validation for MTU changes

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Summary

CVECVE-2026-45952
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:11 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1b0a3950dbd4fa278dc33401a4faba2a23307a16 d7eaa006c0444a5d4671be7efe6dbb33ef8b515e git Not specified
CNA Linux Linux affected 1b0a3950dbd4fa278dc33401a4faba2a23307a16 03399063aa0c67fd8bdfd69467ddb849bb3b97df git Not specified
CNA Linux Linux affected 1b0a3950dbd4fa278dc33401a4faba2a23307a16 ccd8e87748ad083047d6c8544c5809b7f96cc8df git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.14 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.4 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/03399063aa0c67fd8bdfd69467ddb849bb3b97df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ccd8e87748ad083047d6c8544c5809b7f96cc8df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7eaa006c0444a5d4671be7efe6dbb33ef8b515e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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