CVE-2026-98557

/// Technical description

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 th

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References