CyberRota Analysis
AI-GeneratedA vulnerability exists in the Linux kernel's RDMA/rxe component, where the `get_srq_wqe()` function is susceptible to a time-of-check to time-of-use (TOCTOU) heap overflow due to improper validation of the `num_sge` field from a shared receive queue buffer. This flaw allows a concurrent userspace thread to alter `num_sge` between validation and its use, potentially leading to memory corruption and exploitation. Organizations utilizing Linux systems with RDMA capabilities should prioritize this vulnerability to mitigate risks associated with heap overflow attacks.
Original NVD 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.