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

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Summary

CVECVE-2026-74377
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:39 UTC
Updated2026-08-15 06:22:39 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8700e3e7c4857d28ebaa824509934556da0b3e76 2e60378fb3c8b51c94103bb40014c4fe38fa5033 git Not specified
CNA Linux Linux affected 8700e3e7c4857d28ebaa824509934556da0b3e76 fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78 git Not specified
CNA Linux Linux affected 8700e3e7c4857d28ebaa824509934556da0b3e76 9fa785137303f7109c23dea779b8dedc67c9b531 git Not specified
CNA Linux Linux affected 8700e3e7c4857d28ebaa824509934556da0b3e76 5420eebf3b3c162bfaf965f30e61cd1d689e5732 git Not specified
CNA Linux Linux affected 8700e3e7c4857d28ebaa824509934556da0b3e76 a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b git Not specified
CNA Linux Linux affected 8700e3e7c4857d28ebaa824509934556da0b3e76 d6ab440240a04b8737ee4c7bb21af9182e451733 git Not specified
CNA Linux Linux affected 4.8 Not specified
CNA Linux Linux unaffected 4.8 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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