CVE-2026-98643: bpf: Fix out-of-bounds read of rtt_min in sock_ops
bpf: Fix out-of-bounds read of rttmin in sockops
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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Fixed in 6.6.159.1-1 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 7.0.0-42.42.1 - Compensating control
In the Linux kernel sock_ops context rewrite, read rtt_min through SOCK_OPS_GET_FIELD() instead of the hand-computed tcp_sock offset, so is_locked_tcp_sock is checked and 0 is returned for non-full sockets.
Event History
Frequently Asked Questions
Which workloads can trigger the out-of-bounds read?
A BPF program of type sockops can trigger it when it reads skops->rtt_min during the BPF_SOCK_OPS_RWND_INIT operation. On the tcp_conn_request() path, sock_ops->sk is a request_sock rather than a full TCP socket.
What information may be exposed by the read?
The read can return adjacent kernel memory rather than the intended RTT value. One observed value contained the high half of a leaked kernel pointer.
How does the fix change the result for non-full sockets?
The fix reads rtt_min through SOCK_OPS_GET_FIELD(), which checks whether the socket is a locked full TCP socket. If it is not, the field access returns 0 instead of reading beyond the request_sock.