CVE-2026-45852
Estado: ModificadaAlta (7.8)—
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.
Fix this by moving 'srq->rq.queue = q' after copy_to_user.
Detalles técnicos trazas, registros y código del informe original
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]
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1499.004Application or System Exploitationimpact65 %
Vector CVSS AV:L/PR:L/UI:N indica escalada local sin interacción (T1068). El doble free en memoria kernel permite crash (DoS) o ejecución de código con privilegios elevados; confianza moderada por ser defecto en manejo de errores.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-415
- CWE-1341
Referencias
- https://git.kernel.org/stable/c/0beefd0e15d962f497aad750b2d5e9c3570b66d1
- https://git.kernel.org/stable/c/26793db60925df1e88a29466813d586cbc190b8c
- https://git.kernel.org/stable/c/26a9cfe12f4ffdeaa136f252478986fa5f397ddc
- https://git.kernel.org/stable/c/5c07aef09a121a4cd622a71eb0753a9e135c84a8
- https://git.kernel.org/stable/c/9abff51163aa1bc275ec356f74fe976291860a7f
- https://git.kernel.org/stable/c/b98ab5494dbd48652561aa0b9c32f10500220745
- https://git.kernel.org/stable/c/ce6f8e007682f378279d4cf83b240f12d52c723b
- https://git.kernel.org/stable/c/d493e0bfc748a520c349d6c8791b262aa5ad2e4e
- 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
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix double free in rxe_srq_from_init\n\nIn rxe_srq_from_init(), the queue pointer 'q' is assigned to\n'srq->rq.queue' before copying the SRQ number to user space.\nIf copy_to_user() fails, the function calls rxe_queue_cleanup()\nto free the queue, but leaves the now-invalid pointer in\n'srq->rq.queue'.\n\nThe caller of rxe_srq_from_init() (rxe_create_srq) eventually\ncalls rxe_srq_cleanup() upon receiving the error, which triggers\na second rxe_queue_cleanup() on the same memory, leading to a\ndouble free.\n\nThe call trace looks like this:\n kmem_cache_free+0x.../0x...\n rxe_queue_cleanup+0x1a/0x30 [rdma_rxe]\n rxe_srq_cleanup+0x42/0x60 [rdma_rxe]\n rxe_elem_release+0x31/0x70 [rdma_rxe]\n rxe_create_srq+0x12b/0x1a0 [rdma_rxe]\n ib_create_srq_user+0x9a/0x150 [ib_core]\n\nFix this by moving 'srq->rq.queue = q' after copy_to_user."
}
],
"lastModified": "2026-08-20T13:18:52.123",
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