Linux Kernel up to 6.13.2 store deadlock

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.13.2 and classified as critical. The impacted element is the function store. Performing a manipulation results in deadlock. This vulnerability is cataloged as CVE-2025-21817. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.13.2. This affects the function store. The manipulation with an unknown input leads to a deadlock vulnerability. CWE is classifying the issue as CWE-833. The product contains multiple threads or executable segments that are waiting for each other to release a necessary lock, resulting in deadlock. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: block: mark GFP_NOIO around sysfs ->store() sysfs ->store is called with queue freezed, meantime we have several ->store() callbacks(update_nr_requests, wbt, scheduler) to allocate memory with GFP_KERNEL which may run into direct reclaim code path, then potential deadlock can be caused. Fix the issue by marking NOIO around sysfs ->store()

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2025-21817 since 12/29/2024. The exploitability is told to be difficult. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 237679 (Amazon Linux 2023 : bpftool, kernel6.12, kernel6.12-modules-extra (ALAS2023-2025-984)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.13.3 or 6.14-rc1 eliminates this vulnerability. Applying the patch 2566ce907e5d5db8a039647208e029ce559baa31/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c 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 (237679), EUVD (EUVD-2025-5983) and CERT Bund (WID-SEC-2025-0461). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Deadlock
CWE: CWE-833 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 237679
Nessus Name: Amazon Linux 2023 : bpftool, kernel6.12, kernel6.12-modules-extra (ALAS2023-2025-984)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.13.3/6.14-rc1
Patch: 2566ce907e5d5db8a039647208e029ce559baa31/7c0be4ead1f8f5f8be0803f347de0de81e3b8e1c

Timelineinfo

12/29/2024 🔍
02/27/2025 +60 days 🔍
02/27/2025 +0 days 🔍
02/17/2026 +354 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-21817 (🔍)
GCVE (CVE): GCVE-0-2025-21817
GCVE (VulDB): GCVE-100-297909
EUVD: 🔍
CERT Bund: WID-SEC-2025-0461 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 02/27/2025 21:34
Updated: 02/17/2026 00:17
Changes: 02/27/2025 21:34 (58), 06/03/2025 07:00 (2), 06/19/2025 17:02 (1), 07/20/2025 16:06 (7), 10/28/2025 05:19 (12), 02/17/2026 00:17 (1)
Complete: 🔍
Cache ID: 216::103

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