CVE-2026-31492

Local system hang via uninitialized completion

Published Apr 22, 2026 · Updated Apr 22, 2026

Use of an uninitialized completion in Linux Kernel allows local users to hang the system through the irdma RDMA driver. In irdma_create_qp, an ib_copy_to_udata failure invokes irdma_destroy_qp before free_qp is initialized, so cleanup waits on an uninitialized completion. A low-privileged local user must cause the copy to fail during queue-pair creation; the resulting cleanup wait can interrupt service.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of an uninitialized completion in Linux Kernel allows local users to hang the system through the irdma RDMA driver. In irdma_create_qp, an ib_copy_to_udata failure invokes irdma_destroy_qp before free_qp is initialized, so cleanup waits on an uninitialized completion. A low-privileged local user must cause the copy to fail during queue-pair creation; the resulting cleanup wait can interrupt service.

The record

CVE
CVE-2026-31492
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=5.14
  2. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <11a95521fb93c91e2d4ef9d53dc80ef0a755549b
  3. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <3cb88c12461b71c7d9c604aa2e6a9a477ecfa147
  4. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <ac1da7bd224d406b6f1b84414f0f652ab43b6bd8
  5. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <af310407f79d5816fc0ab3638e1588b6193316dd
  6. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <cd1534c8f4984432382c240f6784408497f5bb0a
  7. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <f72996834f7bdefc2b95e3eec30447ee195df44e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <11a95521fb93c91e2d4ef9d53dc80ef0a755549b; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <3cb88c12461b71c7d9c604aa2e6a9a477ecfa147; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <ac1da7bd224d406b6f1b84414f0f652ab43b6bd8; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <af310407f79d5816fc0ab3638e1588b6193316dd; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <cd1534c8f4984432382c240f6784408497f5bb0a; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <f72996834f7bdefc2b95e3eec30447ee195df44e

Published CVSS scores

5.5NIST NVDCVSS: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-908Use of Uninitialized Resource
T1499Endpoint Denial of Service

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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