CVE-2026-74330

Local privilege escalation via configfs cursor race

Published Aug 15, 2026 · Updated Aug 15, 2026

A race condition in Linux configfs allows local users to corrupt kernel memory through concurrent directory operations. Several functions in fs/configfs/dir.c traverse the s_children list without configfs_dirent_lock even though concurrent lseek() or close() can move or free a readdir cursor. Local users with access to a mounted configfs tree can drive the race, causing use-after-free and list corruption that can crash the kernel or enable privilege escalation.

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

A race condition in Linux configfs allows local users to corrupt kernel memory through concurrent directory operations. Several functions in fs/configfs/dir.c traverse the s_children list without configfs_dirent_lock even though concurrent lseek() or close() can move or free a readdir cursor. Local users with access to a mounted configfs tree can drive the race, causing use-after-free and list corruption that can crash the kernel or enable privilege escalation.

The record

CVE
CVE-2026-74330
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1068
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=2.6.27
  2. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <459860529c109c5ce08b81c0776ca1200eaaeb4a
  3. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <637ef4961470e04455102b34ac484a34d8eca0a4
  4. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <77fd6f50f633a52c2db061e7d71d8cb486b0265e
  5. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <91f289728ec706b7ff1ca0ee845dd73ff2253488
  6. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <9b9e8bb81c41fd27e7b57a1c936fde140548535f
  7. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <9e57e2863872e82e7c7237bc32299f67ebebc543
  8. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb
  9. Affected versionversion=6f61076406251626be39651d114fac412b1e0c39 <e6d93108e0a27d7e6f95c7e45017d14ba2900d32

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=6f61076406251626be39651d114fac412b1e0c39 <459860529c109c5ce08b81c0776ca1200eaaeb4a; version=6f61076406251626be39651d114fac412b1e0c39 <637ef4961470e04455102b34ac484a34d8eca0a4; version=6f61076406251626be39651d114fac412b1e0c39 <77fd6f50f633a52c2db061e7d71d8cb486b0265e; version=6f61076406251626be39651d114fac412b1e0c39 <91f289728ec706b7ff1ca0ee845dd73ff2253488; version=6f61076406251626be39651d114fac412b1e0c39 <9b9e8bb81c41fd27e7b57a1c936fde140548535f; version=6f61076406251626be39651d114fac412b1e0c39 <9e57e2863872e82e7c7237bc32299f67ebebc543; version=6f61076406251626be39651d114fac412b1e0c39 <b166ab78dc3f48e83d2c80bdfde4159b31fdc5fb; version=6f61076406251626be39651d114fac412b1e0c39 <e6d93108e0a27d7e6f95c7e45017d14ba2900d32

Published CVSS scores

6.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H
7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Oracle LinuxCVSS: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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1068Exploitation for Privilege Escalation

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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