# CVE-2021-47392: linux: In the Linux kernel, the following vulnerability has been resolved:  RDMA/cma: Fix listener leak in rdma_cma_listen_o...

CVE-2021-47392 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47392, released May 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47392
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.12-1 | [DEBIAN-CVE-2021-47392](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47392.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.12-1 | [DEBIAN-CVE-2021-47392](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47392.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.14.12-1 | [DEBIAN-CVE-2021-47392](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47392.md) | May 21, 2024 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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