CVE-2026-45852

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix double free in rxe_srq_from_init In rxe_srq_from_init(), the queue pointer 'q' is assigned to 'srq->rq.queue' before copying the SRQ number to user space. If copy_to_user() fails, the function calls rxe_queue_cleanup() to free the queue, but leaves the now-invalid pointer in 'srq->rq.queue'. The caller of rxe_srq_from_init() (rxe_create_srq) eventually calls rxe_srq_cleanup() upon receiving the error, which triggers a second rxe_queue_cleanup() on the same memory, leading to a double free. The call trace looks like this: kmem_cache_free+0x.../0x... rxe_queue_cleanup+0x1a/0x30 [rdma_rxe] rxe_srq_cleanup+0x42/0x60 [rdma_rxe] rxe_elem_release+0x31/0x70 [rdma_rxe] rxe_create_srq+0x12b/0x1a0 [rdma_rxe] ib_create_srq_user+0x9a/0x150 [ib_core] Fix this by moving 'srq->rq.queue = q' after copy_to_user.

References

• https://git.kernel.org/stable/c/0beefd0e15d962f497aad750b2d5e9c3570b66d1
• https://git.kernel.org/stable/c/22b8c23a3b92d023614bb00896fe364b2c1a31d3
• https://git.kernel.org/stable/c/26793db60925df1e88a29466813d586cbc190b8c
• https://git.kernel.org/stable/c/26a9cfe12f4ffdeaa136f252478986fa5f397ddc
• https://git.kernel.org/stable/c/5c07aef09a121a4cd622a71eb0753a9e135c84a8