CVE-2025-21892

RDMA task hang via premature UMR QP reset

Published Mar 27, 2025 · Updated May 23, 2026

Race condition in Linux 5.19.10 through 6.12.17, 6.13 through 6.13.5, and 6.14-rc1 through 6.14-rc4 allows local users to hang RDMA tasks. The mlx5 UMR recovery flow resets its queue pair before outstanding work requests finish, letting firmware discard flushed completion entries. Reaching the race requires low-privileged local RDMA access to an mlx5 device and a UMR recovery event; lost entries can block deregistration tasks indefinitely.

CVSS severity4.7
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux 5.19.10 through 6.12.17, 6.13 through 6.13.5, and 6.14-rc1 through 6.14-rc4 allows local users to hang RDMA tasks. The mlx5 UMR recovery flow resets its queue pair before outstanding work requests finish, letting firmware discard flushed completion entries. Reaching the race requires low-privileged local RDMA access to an mlx5 device and a UMR recovery event; lost entries can block deregistration tasks indefinitely.

The record

CVE
CVE-2025-21892
Published
Mar 27, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2 <1d2b84d8d054313deed2b2fcafe1168bbcb9e99f
  2. Affected versionversion=158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2 <3e3bf255992cc02404e9d209b127c1c9944239cf
  3. Affected versionversion=158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2 <d97505baea64d93538b16baf14ce7b8c1fbad746
  4. Affected versionversion=5.19.10 <5.20
  5. Affected versionversion=6.0
  6. Affected versionversion=d8f7bff9a42627d37f4ecffeb01e44db42167175

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2 <1d2b84d8d054313deed2b2fcafe1168bbcb9e99f; version=158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2 <3e3bf255992cc02404e9d209b127c1c9944239cf; version=158e71bb69e368b8b33e8b7c4ac8c111da0c1ae2 <d97505baea64d93538b16baf14ce7b8c1fbad746; version=5.19.10 <5.20; version=6.0; version=d8f7bff9a42627d37f4ecffeb01e44db42167175

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7UbuntuCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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