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5.5
MEDIUM CVSS 3.1
CVE-2021-47392
RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure
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.

INFO

Published Date :

May 21, 2024, 3:15 p.m.

Last Modified :

Sept. 23, 2025, 8:16 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2021-47392 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
This vulnerability can be resolved by updating the affected kernel packages.
  • Update the affected Linux kernel packages.
  • Reboot the system after the update.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-47392.

URL 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
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47392 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-47392 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-47392 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-47392 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Sep. 23, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-401
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.14.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10.4 up to (excluding) 5.10.71
    Added Reference Type CVE: https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 Types: Patch
    Added Reference Type CVE: https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 Types: Patch
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4
    Added Reference https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81
    Added Reference https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 28, 2024

    Action Type Old Value New Value
  • CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 21, 2024

    Action Type Old Value New Value
    Added 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.
    Added Reference kernel.org https://git.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81 [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact