Linux Kernel up to 6.18.16/6.19.6/7.0-rc2 configfs wa_bb_store allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.16/6.19.6/7.0-rc2 and classified as critical. This impacts the function wa_bb_store of the component configfs. Such manipulation leads to allocation of resources. This vulnerability is referenced as CVE-2026-23421. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.16/6.19.6/7.0-rc2 and classified as critical. Affected by this issue is the function wa_bb_store of the component configfs. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: drm/xe/configfs: Free ctx_restore_mid_bb in release ctx_restore_mid_bb memory is allocated in wa_bb_store(), but xe_config_device_release() only frees ctx_restore_post_bb. Free ctx_restore_mid_bb[0].cs as well to avoid leaking the allocation when the configfs device is removed. (cherry picked from commit a235e7d0098337c3f2d1e8f3610c719a589e115f)

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-23421 since 01/13/2026. There are known technical details, but no exploit is available.

Upgrading to version 6.18.17, 6.19.7 or 7.0-rc3 eliminates this vulnerability. Applying the patch 7f971dfd48983074adc7bbcea3ee95ce7aad47cb/3557359ea3df32430ea7c30f7a708ca9a91d7e0e/e377182f0266f46f02d01838e6bde67b9dac0d66 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 vulnerability database at CERT Bund (WID-SEC-2026-0985). Once again VulDB remains the best source for vulnerability data.

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
  • RESF Rocky Linux
  • Microsoft Azure Linux

Productinfo

Type

Vendor

Name

Version

License

Website

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

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

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.17/6.19.7/7.0-rc3
Patch: 7f971dfd48983074adc7bbcea3ee95ce7aad47cb/3557359ea3df32430ea7c30f7a708ca9a91d7e0e/e377182f0266f46f02d01838e6bde67b9dac0d66

Timelineinfo

01/13/2026 CVE reserved
04/03/2026 +79 days Advisory disclosed
04/03/2026 +0 days VulDB entry created
06/24/2026 +82 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23421 (🔒)
GCVE (CVE): GCVE-0-2026-23421
GCVE (VulDB): GCVE-100-355100
CERT Bund: WID-SEC-2026-0985 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/03/2026 17:04
Updated: 06/24/2026 22:19
Changes: 04/03/2026 17:04 (59), 04/08/2026 01:59 (7), 05/11/2026 16:24 (1), 06/24/2026 22:19 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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