CVE-2024-39508

Local kernel memory corruption via io-wq flag race

Published Jul 12, 2024 · Updated Aug 5, 2026

A race condition in the Linux kernel allows local users to corrupt io-wq worker state through concurrent io_uring operations. io_worker_handle_work and io_wq_activate_free_worker read and modify worker->flags nonatomically on different CPUs, permitting stale free-list state. An unprivileged account with io_uring enabled can repeatedly trigger the race, exposing kernel heap data, creating a write primitive, or hanging requests.

CVSS severity7.8
High
EPSS probability0.22%
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 the Linux kernel allows local users to corrupt io-wq worker state through concurrent io_uring operations. io_worker_handle_work and io_wq_activate_free_worker read and modify worker->flags nonatomically on different CPUs, permitting stale free-list state. An unprivileged account with io_uring enabled can repeatedly trigger the race, exposing kernel heap data, creating a write primitive, or hanging requests.

The record

CVE
CVE-2024-39508
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2b188cc1bb857a9d4701ae59aa7768b5124e262e <1cbb0affb15470a9621267fe0a8568007553a4bf
  2. Affected versionversion=2b188cc1bb857a9d4701ae59aa7768b5124e262e <8a565304927fbd28c9f028c492b5c1714002cbab
  3. Affected versionversion=2b188cc1bb857a9d4701ae59aa7768b5124e262e <ab702c3483db9046bab9f40306f1a28b22dbbdc0
  4. Affected versionversion=5.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2b188cc1bb857a9d4701ae59aa7768b5124e262e <1cbb0affb15470a9621267fe0a8568007553a4bf; version=2b188cc1bb857a9d4701ae59aa7768b5124e262e <8a565304927fbd28c9f028c492b5c1714002cbab; version=2b188cc1bb857a9d4701ae59aa7768b5124e262e <ab702c3483db9046bab9f40306f1a28b22dbbdc0; version=5.1

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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