CVE-2026-45852
RDMA/rxe: Fix double free in rxe_srq_from_init
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.
INFO
Published Date :
May 27, 2026, 2:16 p.m.
Last Modified :
May 30, 2026, 11:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the kernel patch for RDMA/rxe double free.
- Update the Linux kernel to the patched version.
- Recompile the kernel with the applied fix.
- Deploy the updated kernel to affected systems.
Public PoC/Exploit Available at Github
CVE-2026-45852 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 30, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 27, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/0beefd0e15d962f497aad750b2d5e9c3570b66d1 Added Reference https://git.kernel.org/stable/c/22b8c23a3b92d023614bb00896fe364b2c1a31d3 Added Reference https://git.kernel.org/stable/c/26793db60925df1e88a29466813d586cbc190b8c Added Reference https://git.kernel.org/stable/c/26a9cfe12f4ffdeaa136f252478986fa5f397ddc Added Reference https://git.kernel.org/stable/c/5c07aef09a121a4cd622a71eb0753a9e135c84a8 Added Reference https://git.kernel.org/stable/c/af5956243018918130d52c9f671efdb40bab3366 Added Reference https://git.kernel.org/stable/c/ce6f8e007682f378279d4cf83b240f12d52c723b Added Reference https://git.kernel.org/stable/c/d286f0d4e3ad3caf5f0e673cdad7bf89bf37d947