VDB-351567 · CVE-2026-23263 · EUVD-2026-12900

Linux Kernel up to 6.18.9 zcrx io_uring denial of service

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5.5	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.9. The impacted element is the function io_uring of the component zcrx. Performing a manipulation results in denial of service. This vulnerability is reported as CVE-2026-23263. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.18.9. This affects the function io_uring of the component zcrx. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: io_uring/zcrx: fix page array leak d9f595b9a65e ("io_uring/zcrx: fix leaking pages on sg init fail") fixed a page leakage but didn't free the page array, release it as well.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-23263 since 01/13/2026. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 303168 (Linux Distros Unpatched Vulnerability : CVE-2026-23263), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.10 eliminates this vulnerability. Applying the patch 64cf3016234ce8a6e4195ed1b2d9e2a1ae41b57d/0ae91d8ab70922fb74c22c20bedcb69459579b1c 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 (303168), EUVD (EUVD-2026-12900) and CERT Bund (WID-SEC-2026-0790). Be aware that VulDB is the high quality source for vulnerability data.

Affected

Open Source Linux Kernel

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 303168
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23263

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.10
Patch: 64cf3016234ce8a6e4195ed1b2d9e2a1ae41b57d/0ae91d8ab70922fb74c22c20bedcb69459579b1c

Timelineinfo

01/13/2026 CVE reserved
03/18/2026 +64 days Advisory disclosed
03/18/2026 +0 days VulDB entry created
03/24/2026 +6 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23263 (🔒)
GCVE (CVE): GCVE-0-2026-23263
GCVE (VulDB): GCVE-100-351567
EUVD: 🔒
CERT Bund: WID-SEC-2026-0790 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/18/2026 19:44
Updated: 03/24/2026 18:41
Changes: 03/18/2026 19:44 (58), 03/18/2026 20:58 (1), 03/19/2026 19:45 (7), 03/23/2026 18:35 (2), 03/24/2026 18:41 (1)
Complete: 🔍
Cache ID: 216::103