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Vulnerability record · CVE-2026-45852 · published 27 May 2026

CVE-2026-45852: Linux kernel double free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.0% CWE-415 · Double freeCWE-1341 · CWE-1341
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
21References
20 Aug 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0beefd0e15d962f497aad750b2d5e9c3570b66d1 Patch
https://git.kernel.org/stable/c/26793db60925df1e88a29466813d586cbc190b8c Patch
https://git.kernel.org/stable/c/26a9cfe12f4ffdeaa136f252478986fa5f397ddc Patch
https://git.kernel.org/stable/c/5c07aef09a121a4cd622a71eb0753a9e135c84a8 Patch
https://git.kernel.org/stable/c/9abff51163aa1bc275ec356f74fe976291860a7f Patch
https://git.kernel.org/stable/c/b98ab5494dbd48652561aa0b9c32f10500220745 Patch
https://git.kernel.org/stable/c/ce6f8e007682f378279d4cf83b240f12d52c723b Patch
https://git.kernel.org/stable/c/d493e0bfc748a520c349d6c8791b262aa5ad2e4e Patch
https://access.redhat.com/errata/RHSA-2026:25120
https://access.redhat.com/errata/RHSA-2026:25121
https://access.redhat.com/errata/RHSA-2026:25217
https://access.redhat.com/errata/RHSA-2026:27713
https://access.redhat.com/errata/RHSA-2026:33899
https://access.redhat.com/errata/RHSA-2026:34094
https://access.redhat.com/errata/RHSA-2026:35844
https://access.redhat.com/errata/RHSA-2026:35863
https://access.redhat.com/errata/RHSA-2026:35896
https://access.redhat.com/errata/RHSA-2026:41236
https://access.redhat.com/security/cve/CVE-2026-45852
https://bugzilla.redhat.com/show_bug.cgi?id=2482166
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45852.json

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Source: NIST National Vulnerability Database (record CVE-2026-45852), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.