Live › vulnerability › CVE-2026-98557
Go to dashboardThe gve network driver in the Linux kernel computes header length with the TCP header rule even for UDP GSO packets, so segment buffer counts can be wrong. The sources describe a wrong-size header causing either needless GSO disabling or a packet whose segments exceed the driver's descriptor limit.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Systems running Linux with a Google Virtual NIC (gve) driver, typically Google Compute Engine virtual machines, where UDP GSO traffic is sent through the DQO queue format. Hosts without the gve driver, or using other NICs, are not affected. The sources do not say whether the wrong count can be triggered by remote traffic or only by local senders.
No product ranges from the sources yet.
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In the Linux kernel, the following vulnerability has been resolved:
gve: DQO: fix header length used by gve_can_send_tso() for UDP GSO
gve_can_send_tso() computes how many buffers each segment of a GSO packet would span, and for this it needs the length of the headers that the device replicates in front of every segment.
It unconditionally uses skb_tcp_all_headers(), which reads the doff field of the TCP header. SKB_GSO_UDP_L4 packets have no TCP header: tcp_hdrlen() then reads one byte of the UDP payload, and header_len can be anything in [0, 60] instead of the transport offset plus the eight bytes of the UDP header that gve_prep_tso() programs into the TSO context descriptor.
A wrong header length shifts all the segment boundaries computed in the loop, so the number of buffers per segment can be over or under estimated. In the first case, GSO is needlessly disabled for this packet by gve_features_check_dqo() and the stack has to segment it. In the second case, the driver hands the device a packet whose segments span more than GVE_TX_MAX_DATA_DESCS buffers.
Use the UDP header length for SKB_GSO_UDP_L4 packets, matching what gve_prep_tso() does.
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