gve: DQO: reject TSO packets with an out of range MSS

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Summary

CVECVE-2026-98556
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:07 UTC
Updated2026-10-18 16:17:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: gve: DQO: reject TSO packets with an out of range MSS gve_prep_tso() notes that the device requires the MSS to be <= 9728, but does not enforce it, assuming the 9K MTU enforced by the hypervisor and the 64KB limit on TSO sizes are enough. This does not hold for packets that were not generated locally. A guest behind a tap, or any packet socket user, can provide an arbitrary gso_size in virtio_net_hdr. Layer 2 forwarding does not check the MTU for GSO packets (is_skb_forwardable()), and gso_features_check() only bounds skb->len and gso_segs, never gso_size. Such a packet reaches gve_tx_fill_tso_ctx_desc(), which puts gso_size into the mss field of the TSO context descriptor. This field is 14 bits wide, so a gso_size of 16384 is silently turned into an MSS of zero. Drop these packets from gve_prep_tso(), and make sure that gve_features_check_dqo() leaves their GSO bits alone: skb_segment() splits at gso_size regardless of the MTU, so falling back to software segmentation would give the device non TSO packets bigger than the 9728 bytes it supports. Note that the device can still be given oversized non TSO packets when the stack segments in software for other reasons, for instance after TSO has been disabled with ethtool. This is a generic issue, because the MTU check is skipped for GSO packets in the forwarding path, and is addressed separately.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a57e5de476be0b4b7f42beb6a21c19ad9c577aa3 2dc3ae3942e151fef254b7bbb65c832192ad2069 git Not specified
CNA Linux Linux affected a57e5de476be0b4b7f42beb6a21c19ad9c577aa3 c517e8755960c8c6335ebf7dae6c95c43e5fb085 git Not specified
CNA Linux Linux affected a57e5de476be0b4b7f42beb6a21c19ad9c577aa3 296c83b5ccc808c080865eb20fd7a477b0355bb7 git Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c517e8755960c8c6335ebf7dae6c95c43e5fb085 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2dc3ae3942e151fef254b7bbb65c832192ad2069 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/296c83b5ccc808c080865eb20fd7a477b0355bb7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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