CVE-2026-74378
Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe get_srq_wqe() reads wqe->dma.num_sge from the shared receive queue buffer, which is mapped into userspace. It validates num_sge against max_sge, but then re-reads the same field to calculate the memcpy size. A concurrent userspace thread can modify num_sge between validation and use, causing a heap buffer overflow when copying the WQE into qp->resp.srq_wqe. Read num_sge into a local variable and use it for both the bounds check and the size calculation.
How to fix
- Linux Linuxc8db0e5ab0b6c540214c46c56aaac7cbcb0967fe, e48daa94ad2d406225b73491fc935064716f0ec7, 3cfa2a3adc51b7c57729961a03446962ff10e3d2, cd19a6345e3727adafafa5954b58b13c92e13b80, 3e07ea9579dc9553d2285c26c2823931358aa3b8, 02558c86b6b761063e9399e6b939984500327ef1, b9800d7953d119bcc068c74587d48e4ba0313629, 22b8fbded65b8c441b634a185f8da67657df6c50 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe, 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < e48daa94ad2d406225b73491fc935064716f0ec7, 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 3cfa2a3adc51b7c57729961a03446962ff10e3d2, 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < cd19a6345e3727adafafa5954b58b13c92e13b80, 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 3e07ea9579dc9553d2285c26c2823931358aa3b8, 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 02558c86b6b761063e9399e6b939984500327ef1, 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < b9800d7953d119bcc068c74587d48e4ba0313629, 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 22b8fbded65b8c441b634a185f8da67657df6c50, 4.8 | c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe, e48daa94ad2d406225b73491fc935064716f0ec7, 3cfa2a3adc51b7c57729961a03446962ff10e3d2, cd19a6345e3727adafafa5954b58b13c92e13b80, 3e07ea9579dc9553d2285c26c2823931358aa3b8, 02558c86b6b761063e9399e6b939984500327ef1, b9800d7953d119bcc068c74587d48e4ba0313629, 22b8fbded65b8c441b634a185f8da67657df6c50 |
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