Linux Kernel up to 6.12.52/6.17.2 io_waitid_wait privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.12.52/6.17.2. It has been classified as critical. Affected by this issue is the function io_waitid_wait. This manipulation causes an unknown weakness. This vulnerability is registered as CVE-2025-40047. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.12.52/6.17.2. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: io_uring/waitid: always prune wait queue entry in io_waitid_wait() For a successful return, always remove our entry from the wait queue entry list. Previously this was skipped if a cancelation was in progress, but this can race with another invocation of the wait queue entry callback.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2025-40047 since 04/16/2025. The exploitation appears to be difficult. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 271908 (Linux Distros Unpatched Vulnerability : CVE-2025-40047), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.53, 6.17.3 or 6.18-rc1 eliminates this vulnerability. Applying the patch 696ba6032081e617564a8113a001b8d7943cb928/3e2205db2f0608898d535da1964e1b376aacfdaa/2f8229d53d984c6a05b71ac9e9583d4354e3b91f is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (271908) and CERT Bund (WID-SEC-2025-2431). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Microsoft Azure
  • Dell NetWorker
  • Dell ECS

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 271908
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-40047

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.53/6.17.3/6.18-rc1
Patch: 696ba6032081e617564a8113a001b8d7943cb928/3e2205db2f0608898d535da1964e1b376aacfdaa/2f8229d53d984c6a05b71ac9e9583d4354e3b91f

Timelineinfo

04/16/2025 CVE reserved
10/28/2025 +195 days Advisory disclosed
10/28/2025 +0 days VulDB entry created
05/20/2026 +203 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40047 (🔒)
GCVE (CVE): GCVE-0-2025-40047
GCVE (VulDB): GCVE-100-330265
CERT Bund: WID-SEC-2025-2431 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/28/2025 14:50
Updated: 05/20/2026 01:45
Changes: 10/28/2025 14:50 (57), 10/29/2025 09:30 (2), 10/30/2025 05:37 (7), 10/31/2025 09:59 (1), 11/24/2025 15:14 (1), 12/22/2025 00:54 (1), 02/08/2026 16:45 (1), 02/15/2026 19:08 (1), 05/20/2026 01:45 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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