{"id":"CVE-2026-74378","revision":"a5a7e2b7d30b432282e2e256069622e7","records":[{"revision":"a5a7e2b7d30b432282e2e256069622e7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74378","aliases":[],"title":"RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe\n\nget_srq_wqe() reads wqe->dma.num_sge from the shared receive queue\nbuffer, which is mapped into userspace. It validates num_sge against\nmax_sge, but then re-reads the same field to calculate the memcpy\nsize. A concurrent userspace thread can modify num_sge between\nvalidation and use, causing a heap buffer overflow when copying the\nWQE into qp->resp.srq_wqe.\n\nRead num_sge into a local variable and use it for both the bounds\ncheck and the size calculation.","state":0,"publishedAt":"2026-08-15T05:58:56.381+00:00","modifiedAt":"2026-10-16T18:55:36.455+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/infiniband/sw/rxe/rxe_resp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"e48daa94ad2d406225b73491fc935064716f0ec7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"3cfa2a3adc51b7c57729961a03446962ff10e3d2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"cd19a6345e3727adafafa5954b58b13c92e13b80\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"3e07ea9579dc9553d2285c26c2823931358aa3b8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"02558c86b6b761063e9399e6b939984500327ef1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"b9800d7953d119bcc068c74587d48e4ba0313629\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8700e3e7c4857d28ebaa824509934556da0b3e76\",\n                            \"lessThan\": \"22b8fbded65b8c441b634a185f8da67657df6c50\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/infiniband/sw/rxe/rxe_resp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe","https://git.kernel.org/stable/c/e48daa94ad2d406225b73491fc935064716f0ec7","https://git.kernel.org/stable/c/3cfa2a3adc51b7c57729961a03446962ff10e3d2","https://git.kernel.org/stable/c/cd19a6345e3727adafafa5954b58b13c92e13b80","https://git.kernel.org/stable/c/3e07ea9579dc9553d2285c26c2823931358aa3b8","https://git.kernel.org/stable/c/02558c86b6b761063e9399e6b939984500327ef1","https://git.kernel.org/stable/c/b9800d7953d119bcc068c74587d48e4ba0313629","https://git.kernel.org/stable/c/22b8fbded65b8c441b634a185f8da67657df6c50"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74378","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74378","identifiers":["CVE-2026-74378"]},"retained":false,"historicalAffected":[]}],"coverage":[]}