{"id":"CVE-2026-74378","aliases":[],"url":"https://o3.security/vulnerability/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->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.","published":"2026-08-15T05:58:56.381Z","modified":"2026-08-18T03:56:54.431213562Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.1.178"}],"fix":null,"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/cd19a6345e3727adafafa5954b58b13c92e13b80"},{"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:54.431213562Z"}}