CVE-2026-74334

Kernel corruption via racy RDMA protection-domain access

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in Linux kernel RDMA/nldev from 4.18 through 7.1.4 allows local users to crash or corrupt the kernel during MR re-registration. nldev readers dereference mr->pd while rereg_mr can replace that protection-domain pointer, so unsynchronized access can observe stale state. Reachability requires local low-privileged access to RDMA memory-region re-registration concurrent with nldev resource inspection, with no user interaction.

CVSS severity7.8
High
EPSS probability0.13%
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 kernel RDMA/nldev from 4.18 through 7.1.4 allows local users to crash or corrupt the kernel during MR re-registration. nldev readers dereference mr->pd while rereg_mr can replace that protection-domain pointer, so unsynchronized access can observe stale state. Reachability requires local low-privileged access to RDMA memory-region re-registration concurrent with nldev resource inspection, with no user interaction.

The record

CVE
CVE-2026-74334
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-366, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=4.18
  2. Affected versionversion=da5c8507821573b8ed6e3f47e009f273493ffaf7 <1a132ee4e655288d9a0937ea5109a0d038431ae9
  3. Affected versionversion=da5c8507821573b8ed6e3f47e009f273493ffaf7 <50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=da5c8507821573b8ed6e3f47e009f273493ffaf7 <1a132ee4e655288d9a0937ea5109a0d038431ae9; version=da5c8507821573b8ed6e3f47e009f273493ffaf7 <50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3

Published CVSS scores

7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5SUSECVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-366Race Condition within a Thread
T1499.004Application or System Exploitation

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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