PT-2026-43719 · Linux · Linux

Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-45852

NVD

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Related Identifiers

CVE-2026-45852

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-45852 · Security Note
• https://git.kernel.org/stable/c/26793db60925df1e88a29466813d586cbc190b8c · Note
• https://git.kernel.org/stable/c/af5956243018918130d52c9f671efdb40bab3366 · Note
• https://git.kernel.org/stable/c/5c07aef09a121a4cd622a71eb0753a9e135c84a8 · Note
• https://git.kernel.org/stable/c/ce6f8e007682f378279d4cf83b240f12d52c723b · Note
• https://git.kernel.org/stable/c/26a9cfe12f4ffdeaa136f252478986fa5f397ddc · Note
• https://git.kernel.org/stable/c/d286f0d4e3ad3caf5f0e673cdad7bf89bf37d947 · Note
• https://git.kernel.org/stable/c/22b8c23a3b92d023614bb00896fe364b2c1a31d3 · Note
• https://git.kernel.org/stable/c/0beefd0e15d962f497aad750b2d5e9c3570b66d1 · Note