CVE-2026-74377

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < 2e60378fb3c8b51c94103bb40014c4fe38fa5033affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < 9fa785137303f7109c23dea779b8dedc67c9b531affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < 5420eebf3b3c162bfaf965f30e61cd1d689e5732affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < a211b7904aed365e4e4f08a48ec6e6dd1ea7b16baffected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < d6ab440240a04b8737ee4c7bb21af9182e451733affected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References