{"id":"CVE-2026-74378","summary":"RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe","details":"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-\u003edma.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-\u003eresp.srq_wqe.\n\nRead num_sge into a local variable and use it for both the bounds\ncheck and the size calculation.","modified":"2026-10-28T02:31:07.075550630Z","published":"2026-08-15T05:58:56.381Z","related":["SUSE-SU-2026:23881-1","SUSE-SU-2026:23887-1","SUSE-SU-2026:23897-1","SUSE-SU-2026:23902-1","SUSE-SU-2026:24181-1","SUSE-SU-2026:24182-1","SUSE-SU-2026:24315-1","SUSE-SU-2026:24316-1","SUSE-SU-2026:4279-1","SUSE-SU-2026:4282-1","SUSE-SU-2026:4284-1","SUSE-SU-2026:4347-1","SUSE-SU-2026:4369-1","SUSE-SU-2026:4595-1","SUSE-SU-2026:4640-1","SUSE-SU-2026:4706-1","openSUSE-SU-2026:21910-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74378.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/02558c86b6b761063e9399e6b939984500327ef1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/22b8fbded65b8c441b634a185f8da67657df6c50"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3cfa2a3adc51b7c57729961a03446962ff10e3d2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e07ea9579dc9553d2285c26c2823931358aa3b8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b9800d7953d119bcc068c74587d48e4ba0313629"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd19a6345e3727adafafa5954b58b13c92e13b80"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e48daa94ad2d406225b73491fc935064716f0ec7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74378.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74378"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8700e3e7c4857d28ebaa824509934556da0b3e76"},{"fixed":"c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe"},{"fixed":"e48daa94ad2d406225b73491fc935064716f0ec7"},{"fixed":"3cfa2a3adc51b7c57729961a03446962ff10e3d2"},{"fixed":"cd19a6345e3727adafafa5954b58b13c92e13b80"},{"fixed":"3e07ea9579dc9553d2285c26c2823931358aa3b8"},{"fixed":"02558c86b6b761063e9399e6b939984500327ef1"},{"fixed":"b9800d7953d119bcc068c74587d48e4ba0313629"},{"fixed":"22b8fbded65b8c441b634a185f8da67657df6c50"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74378.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.8.0"},{"fixed":"5.10.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74378.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}