{"id":"CVE-2026-74377","title":"RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Copy WQE to local buffer in non-SRQ receive path\n\nFor non-SRQ QPs, the responder reads WQE fields directly from the\nshared queue buffer mapped into userspace.…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 2e60378fb3c8b51c94103bb40014c4fe38fa5033","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 9fa785137303f7109c23dea779b8dedc67c9b531","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 5420eebf3b3c162bfaf965f30e61cd1d689e5732","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b","Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < d6ab440240a04b8737ee4c7bb21af9182e451733","Linux 4.8"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:54:49.610673Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:55:36.323Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74377","references":[{"url":"https://git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033"},{"url":"https://git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78"},{"url":"https://git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531"},{"url":"https://git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732"},{"url":"https://git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b"},{"url":"https://git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02268,"ingestedAt":"2026-10-16T19:46:24.372Z","slug":"CVE-2026-74377","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Copy WQE to local buffer in non-SRQ receive path\n\nFor non-SRQ QPs, the responder reads WQE fields directly from the\nshared queue buffer mapped into userspace. This allows a malicious\nuser to modify fields like num_sge or sge entries while the kernel\nis processing the WQE, leading to out-of-bounds reads in\nrxe_resp_check_length() and copy_data().\n\nIntroduce get_recv_wqe() that validates num_sge and copies the WQE\nto a kernel-local buffer before processing, matching the approach\nalready used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is\nreused since SRQ and non-SRQ paths are mutually exclusive per QP.\n\n## Affected\n\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 2e60378fb3c8b51c94103bb40014c4fe38fa5033`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 9fa785137303f7109c23dea779b8dedc67c9b531`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 5420eebf3b3c162bfaf965f30e61cd1d689e5732`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b`\n- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < d6ab440240a04b8737ee4c7bb21af9182e451733`\n- `Linux 4.8`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}