CVE-2026-43470

Local kernel oops via negative dentry

Published May 8, 2026 · Updated May 8, 2026

Race condition in the Linux Kernel NFSv3 client allows local users to trigger a kernel oops during concurrent file creation. nfs3_proc_create accepts a directory alias returned through nfs3_do_create without returning EISDIR, leaving the requested dentry negative for finish_open and do_dentry_open. The trigger requires concurrent creation and removal of files and directories with the same name while opening without O_EXCL; the documented consequence is an oops.

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

Race condition in the Linux Kernel NFSv3 client allows local users to trigger a kernel oops during concurrent file creation. nfs3_proc_create accepts a directory alias returned through nfs3_do_create without returning EISDIR, leaving the requested dentry negative for finish_open and do_dentry_open. The trigger requires concurrent creation and removal of files and directories with the same name while opening without O_EXCL; the documented consequence is an oops.

The record

CVE
CVE-2026-43470
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=6.10
  2. Affected versionversion=7c6c5249f061b64fc6b5b90bc147169a048691bf <203c792cb4315360d49973ae2e57feeb6d3dcf7e
  3. Affected versionversion=7c6c5249f061b64fc6b5b90bc147169a048691bf <410666a298c34ebd57256fde6b24c96bd23059a2
  4. Affected versionversion=7c6c5249f061b64fc6b5b90bc147169a048691bf <7e2963773760a664684435201960dd2fb712f1b5
  5. Affected versionversion=7c6c5249f061b64fc6b5b90bc147169a048691bf <9ee1770fcb2f1b48354622b926e7dc10222805f5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.10; version=7c6c5249f061b64fc6b5b90bc147169a048691bf <203c792cb4315360d49973ae2e57feeb6d3dcf7e; version=7c6c5249f061b64fc6b5b90bc147169a048691bf <410666a298c34ebd57256fde6b24c96bd23059a2; version=7c6c5249f061b64fc6b5b90bc147169a048691bf <7e2963773760a664684435201960dd2fb712f1b5; version=7c6c5249f061b64fc6b5b90bc147169a048691bf <9ee1770fcb2f1b48354622b926e7dc10222805f5

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

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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