CVE-2021-47392

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47392
In the Linux kernel, the following vulnerability has been resolved: RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure If cma_listen_on_all() fails it leaves the per-device ID still on the listen_list but the state is not set to RDMA_CM_ADDR_BOUND. When the cmid is eventually destroyed cma_cancel_listens() is not called due to the wrong state, however the per-device IDs are still holding the refcount preventing the ID from being destroyed, thus deadlocking: task:rping state:D stack: 0 pid:19605 ppid: 47036 flags:0x00000084 Call Trace: __schedule+0x29a/0x780 ? free_unref_page_commit+0x9b/0x110 schedule+0x3c/0xa0 schedule_timeout+0x215/0x2b0 ? __flush_work+0x19e/0x1e0 wait_for_completion+0x8d/0xf0 _destroy_id+0x144/0x210 [rdma_cm] ucma_close_id+0x2b/0x40 [rdma_ucm] __destroy_id+0x93/0x2c0 [rdma_ucm] ? __xa_erase+0x4a/0xa0 ucma_destroy_id+0x9a/0x120 [rdma_ucm] ucma_write+0xb8/0x130 [rdma_ucm] vfs_write+0xb4/0x250 ksys_write+0xb5/0xd0 ? syscall_trace_enter.isra.19+0x123/0x190 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Ensure that cma_listen_on_all() atomically unwinds its action under the lock during error.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 Patch
https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 Patch
https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 Patch
https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 Patch
https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 Patch
https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
History

23 Sep 2025, 20:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-401
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 - () https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 - Patch
References () https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 - () https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 - Patch
References () https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 - () https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 - Patch

21 Nov 2024, 06:36

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: RDMA/cma: corrige la fuga del oyente en el fallo de rdma_cma_listen_on_all(). Si cma_listen_on_all() falla, deja el ID por dispositivo todavía en la lista de escucha, pero el estado no está configurado en RDMA_CM_ADDR_BOUND. Cuando el cmid finalmente se destruye, no se llama a cma_cancel_listens() debido a un estado incorrecto; sin embargo, los ID por dispositivo aún mantienen el refcount evitando que el ID se destruya, lo que genera un punto muerto: tarea:rping estado:D pila: 0 pid: 19605 ppid: 47036 banderas: 0x00000084 Seguimiento de llamadas: __schedule+0x29a/0x780? free_unref_page_commit+0x9b/0x110 Schedule+0x3c/0xa0 Schedule_timeout+0x215/0x2b0? __flush_work+0x19e/0x1e0 wait_for_completion+0x8d/0xf0 _destroy_id+0x144/0x210 [rdma_cm] ucma_close_id+0x2b/0x40 [rdma_ucm] __destroy_id+0x93/0x2c0 [rdma_ucm] ? __xa_erase+0x4a/0xa0 ucma_destroy_id+0x9a/0x120 [rdma_ucm] ucma_write+0xb8/0x130 [rdma_ucm] vfs_write+0xb4/0x250 ksys_write+0xb5/0xd0 ? syscall_trace_enter.isra.19+0x123/0x190 do_syscall_64+0x33/0x40 Entry_SYSCALL_64_after_hwframe+0x44/0xa9 Asegúrese de que cma_listen_on_all() desenrolle atómicamente su acción bajo el bloqueo durante el error.
References () https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 - () https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 -
References () https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 - () https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 -
References () https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 - () https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 -

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2025-09-23 20:16

NVD link : CVE-2021-47392

Mitre link : CVE-2021-47392

CVE.ORG link : CVE-2021-47392

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime