CVE-2026-31565

Local service hang via circular QP wait

Published Apr 24, 2026 · Updated Apr 24, 2026

Deadlock in Linux Kernel 5.15.116 through 5.15.202 and affected later branches allows local users to hang RDMA device reset operations. During irdma client removal, uverbs_client waits for a QP reference held by cma_client, creating a circular dependency and indefinite wait. Reachability requires iWARP mode, active RDMA connections, and a netdev reset; the reset and client-removal path remain indefinitely hung.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in Linux Kernel 5.15.116 through 5.15.202 and affected later branches allows local users to hang RDMA device reset operations. During irdma client removal, uverbs_client waits for a QP reference held by cma_client, creating a circular dependency and indefinite wait. Reachability requires iWARP mode, active RDMA connections, and a netdev reset; the reset and client-removal path remain indefinitely hung.

The record

CVE
CVE-2026-31565
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-20, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=07322c8a12d6c796450faacb8be9e5e3c278ec84 <adf0de36e52a48681eb58cbd7cbf6c8d200caa2b
  2. Affected versionversion=0b3c392b82cdf867808a8ea7c6760d3c7e6b6627 <009831768faeca3fb5950ce63f1b49594ec82389
  3. Affected versionversion=6.4
  4. Affected versionversion=6ee53f82540769a6d6e77e40b901f9b9edfa5ff2
  5. Affected versionversion=c8f304d75f6c6cc679a73f89591f9a915da38f09 <464bbb844ba5b68e038220c34019069a0a9f1581
  6. Affected versionversion=c8f304d75f6c6cc679a73f89591f9a915da38f09 <6f52370970ac07d352a7af4089e55e0e6425f827
  7. Affected versionversion=c8f304d75f6c6cc679a73f89591f9a915da38f09 <a8a1c7621127a15a02494b96ee376406c064237b
  8. Affected versionversion=c8f304d75f6c6cc679a73f89591f9a915da38f09 <acb060bc2609c2eab49263968be59c7d59d497bc
  9. Affected versionversion=c8f304d75f6c6cc679a73f89591f9a915da38f09 <cd8bcec2de5e24e05c34c9391940fda6f50e79b4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=07322c8a12d6c796450faacb8be9e5e3c278ec84 <adf0de36e52a48681eb58cbd7cbf6c8d200caa2b; version=0b3c392b82cdf867808a8ea7c6760d3c7e6b6627 <009831768faeca3fb5950ce63f1b49594ec82389; version=6.4; version=6ee53f82540769a6d6e77e40b901f9b9edfa5ff2; version=c8f304d75f6c6cc679a73f89591f9a915da38f09 <464bbb844ba5b68e038220c34019069a0a9f1581; version=c8f304d75f6c6cc679a73f89591f9a915da38f09 <6f52370970ac07d352a7af4089e55e0e6425f827; version=c8f304d75f6c6cc679a73f89591f9a915da38f09 <a8a1c7621127a15a02494b96ee376406c064237b; version=c8f304d75f6c6cc679a73f89591f9a915da38f09 <acb060bc2609c2eab49263968be59c7d59d497bc; version=c8f304d75f6c6cc679a73f89591f9a915da38f09 <cd8bcec2de5e24e05c34c9391940fda6f50e79b4

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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