CVE-2024-56709

Local privilege escalation via io_uring task-exit race

Published Dec 29, 2024 · Updated Aug 5, 2026

Use-after-free in Linux io_uring 5.14 and later affected branches allows local users to gain kernel privileges through a task-exit race. io_queue_iowq() queues task work after teardown has killed and cleared io_wq, so concurrent ring closure and task exit dereference freed or null queue state. Unprivileged io_uring access and control of ring closure and process exit are sufficient; exploitation can elevate privileges, crash the kernel, or hang the ring.

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

Use-after-free in Linux io_uring 5.14 and later affected branches allows local users to gain kernel privileges through a task-exit race. io_queue_iowq() queues task work after teardown has killed and cleared io_wq, so concurrent ring closure and task exit dereference freed or null queue state. Unprivileged io_uring access and control of ring closure and process exit are sufficient; exploitation can elevate privileges, crash the kernel, or hang the ring.

The record

CVE
CVE-2024-56709
Published
Dec 29, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 29, 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=5.14
  2. Affected versionversion=773af69121ecc6c53d192661af8d53bb3db028ae <2ca94c8de36091067b9ce7527ae8db3812d38781
  3. Affected versionversion=773af69121ecc6c53d192661af8d53bb3db028ae <4f95a2186b7f2af09331e1e8069bcaf34fe019cf
  4. Affected versionversion=773af69121ecc6c53d192661af8d53bb3db028ae <534d59ab38010aada88390db65985e65d0de7d9e
  5. Affected versionversion=773af69121ecc6c53d192661af8d53bb3db028ae <dbd2ca9367eb19bc5e269b8c58b0b1514ada9156

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=773af69121ecc6c53d192661af8d53bb3db028ae <2ca94c8de36091067b9ce7527ae8db3812d38781; version=773af69121ecc6c53d192661af8d53bb3db028ae <4f95a2186b7f2af09331e1e8069bcaf34fe019cf; version=773af69121ecc6c53d192661af8d53bb3db028ae <534d59ab38010aada88390db65985e65d0de7d9e; version=773af69121ecc6c53d192661af8d53bb3db028ae <dbd2ca9367eb19bc5e269b8c58b0b1514ada9156

Published CVSS scores

7.8Linux kernel CVE teamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon 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

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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

T1499Endpoint Denial of Service
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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