Linux Kernel up to 7.0-rc2 dbroot __configfs_open_file buffer overflow

CVSS Meta Temp Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 7.0-rc2. Affected by this issue is the function __configfs_open_file of the file /sys/kernel/config/target/dbroot. Such manipulation leads to buffer overflow. This vulnerability is traded as CVE-2026-23292. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.0-rc2. It has been rated as critical. Affected by this issue is the function __configfs_open_file of the file /sys/kernel/config/target/dbroot. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix recursive locking in __configfs_open_file() In flush_write_buffer, &p->frag_sem is acquired and then the loaded store function is called, which, here, is target_core_item_dbroot_store(). This function called filp_open(), following which these functions were called (in reverse order), according to the call trace: down_read __configfs_open_file do_dentry_open vfs_open do_open path_openat do_filp_open file_open_name filp_open target_core_item_dbroot_store flush_write_buffer configfs_write_iter target_core_item_dbroot_store() tries to validate the new file path by trying to open the file path provided to it; however, in this case, the bug report shows: db_root: not a directory: /sys/kernel/config/target/dbroot indicating that the same configfs file was tried to be opened, on which it is currently working on. Thus, it is trying to acquire frag_sem semaphore of the same file of which it already holds the semaphore obtained in flush_write_buffer(), leading to acquiring the semaphore in a nested manner and a possibility of recursive locking. Fix this by modifying target_core_item_dbroot_store() to use kern_path() instead of filp_open() to avoid opening the file using filesystem-specific function __configfs_open_file(), and further modifying it to make this fix compatible.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-23292 since 01/13/2026. The exploitation is known to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 303724 (Linux Distros Unpatched Vulnerability : CVE-2026-23292), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7 or 7.0-rc3 eliminates this vulnerability. Applying the patch 3161ef61f121d4573cad5b57c92188dcd9b284b3/e8ef82cb6443d5f3260b1b830e17f03dda4229ea/4fcfa424a581d823cb1a9676e3eefe6ca17e453a/9a5641024fbfd9b24fe65984ad85fea10a3ae438/142eacb50fb903a4c10dee7e67b6e79ebb36a582/14d4ac19d1895397532eec407433c5d74d9da53b 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 (303724) and CERT Bund (WID-SEC-2026-0861). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • F5 BIG-IP

Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
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: 303724
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23292

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.167/6.6.130/6.12.77/6.18.17/6.19.7/7.0-rc3
Patch: 3161ef61f121d4573cad5b57c92188dcd9b284b3/e8ef82cb6443d5f3260b1b830e17f03dda4229ea/4fcfa424a581d823cb1a9676e3eefe6ca17e453a/9a5641024fbfd9b24fe65984ad85fea10a3ae438/142eacb50fb903a4c10dee7e67b6e79ebb36a582/14d4ac19d1895397532eec407433c5d74d9da53b

Timelineinfo

01/13/2026 CVE reserved
03/25/2026 +71 days Advisory disclosed
03/25/2026 +0 days VulDB entry created
07/02/2026 +98 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23292 (🔒)
GCVE (CVE): GCVE-0-2026-23292
GCVE (VulDB): GCVE-100-353024
CERT Bund: WID-SEC-2026-0861 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/25/2026 12:52
Updated: 07/02/2026 01:25
Changes: 03/25/2026 12:52 (59), 03/26/2026 03:49 (7), 03/26/2026 07:59 (2), 03/30/2026 00:43 (1), 06/16/2026 14:27 (1), 07/02/2026 01:25 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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