CVE-2026-74378

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < 3cfa2a3adc51b7c57729961a03446962ff10e3d2affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < cd19a6345e3727adafafa5954b58b13c92e13b80affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < 3e07ea9579dc9553d2285c26c2823931358aa3b8affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < 02558c86b6b761063e9399e6b939984500327ef1affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < b9800d7953d119bcc068c74587d48e4ba0313629affected
LinuxLinux8700e3e7c4857d28ebaa824509934556da0b3e76 < 22b8fbded65b8c441b634a185f8da67657df6c50affected
LinuxLinux4.8affected
LinuxLinux0 < 4.8unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References