CVE-2025-21805
9.8 · CRITICALIn the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs: Add missing deinit() call A warning is triggered when repeatedly connecting and disconnecting the rnbd: list_add co…
Overview
CVE-2025-21805 is a critical-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical description
In the Linux kernel, the following vulnerability has been resolved:
RDMA/rtrs: Add missing deinit() call
A warning is triggered when repeatedly connecting and disconnecting the
rnbd:
list_add corruption. prev->next should be next (ffff88800b13e480), but was ffff88801ecd1338. (prev=ffff88801ecd1340).
WARNING: CPU: 1 PID: 36562 at lib/list_debug.c:32 __list_add_valid_or_report+0x7f/0xa0
Workqueue: ib_cm cm_work_handler [ib_cm]
RIP: 0010:__list_add_valid_or_report+0x7f/0xa0
? __list_add_valid_or_report+0x7f/0xa0
ib_register_event_handler+0x65/0x93 [ib_core]
rtrs_srv_ib_dev_init+0x29/0x30 [rtrs_server]
rtrs_ib_dev_find_or_add+0x124/0x1d0 [rtrs_core]
__alloc_path+0x46c/0x680 [rtrs_server]
? rtrs_rdma_connect+0xa6/0x2d0 [rtrs_server]
? rcu_is_watching+0xd/0x40
? __mutex_lock+0x312/0xcf0
? get_or_create_srv+0xad/0x310 [rtrs_server]
? rtrs_rdma_connect+0xa6/0x2d0 [rtrs_server]
rtrs_rdma_connect+0x23c/0x2d0 [rtrs_server]
? __lock_release+0x1b1/0x2d0
cma_cm_event_
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.
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Frequently asked questions
What is CVE-2025-21805?
CVE-2025-21805 is a critical-severity vulnerability. It was published on February 27, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2025-21805?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-21805?
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-2025-21805?
CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21805 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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