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CVE-2021-47392

5.5 · MEDIUM

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…

Published May 21, 2024CWE-401EPSS 0.24%

Overview

CVE-2021-47392 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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

? sy

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4Refgit.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81Refgit.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35Refgit.kernel.org/stable/c/3f4e68902d2e545033c80d7ad62fd9a439e573f4Refgit.kernel.org/stable/c/ca465e1f1f9b38fe916a36f7d80c5d25f2337c81Refgit.kernel.org/stable/c/e56a5146ef8cb51cd7c9e748267dce7564448a35

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47392?

CVE-2021-47392 is a medium-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47392?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47392?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47392?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47392 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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