RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path For non-SRQ QPs, the responder reads WQE fields directly from the shared queue buffer mapped into userspace. This allows a malicious user to modify fields like num_sge or sge entries while the kernel is processing the WQE, leading to out-of-bounds reads in rxe_resp_check_length() and copy_data(). Introduce get_recv_wqe() that validates num_sge and copies the WQE to a kernel-local buffer before processing, matching the approach already used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is reused since SRQ and non-SRQ paths are mutually exclusive per QP.

Timeline

1. Aug 15, 2026, 5:58 AM UTCCVE published
2. Oct 16, 2026, 6:54 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 16, 2026, 6:55 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 2e60378fb3c8b51c94103bb40014c4fe38fa5033; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 9fa785137303f7109c23dea779b8dedc67c9b531; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in 5420eebf3b3c162bfaf965f30e61cd1d689e5732; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b; From 8700e3e7c4857d28ebaa824509934556da0b3e76 · fixed in d6ab440240a04b8737ee4c7bb21af9182e451733

• Linux Linux

  4.8

• KernelLinux

  From 4.8.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 6