Linux Kernel up to 6.18.15/6.19.5 mux allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel up to 6.18.15/6.19.5 and classified as critical. The affected element is an unknown function of the component mux. Performing a manipulation results in allocation of resources. This vulnerability is known as CVE-2026-43155. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.15/6.19.5. It has been classified as critical. This affects an unknown part of the component mux. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as 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. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mux: mmio: fix regmap leak on probe failure The mmio regmap that may be allocated during probe is never freed. Switch to using the device managed allocator so that the regmap is released on probe failures (e.g. probe deferral) and on driver unbind.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-43155 since 05/01/2026. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 6.18.16 or 6.19.6 eliminates this vulnerability. Applying the patch 76096f156fe9dc9fbd6e4618088706e91b9b0a6c/cbde3c109d52564ae2c12e514c33c44345e84b2c/3c4ae63073d84abee5d81ce46d86a94e9dae9c89 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-2026-1405). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Oracle Linux
  • Microsoft Azure Linux
  • Open Source Linux Kernel

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
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: Allocation of resources
CWE: CWE-770 / CWE-400 / 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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.16/6.19.6
Patch: 76096f156fe9dc9fbd6e4618088706e91b9b0a6c/cbde3c109d52564ae2c12e514c33c44345e84b2c/3c4ae63073d84abee5d81ce46d86a94e9dae9c89

Timelineinfo

05/01/2026 CVE reserved
05/06/2026 +5 days Advisory disclosed
05/06/2026 +0 days VulDB entry created
05/19/2026 +12 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43155 (🔒)
GCVE (CVE): GCVE-0-2026-43155
GCVE (VulDB): GCVE-100-361455
CERT Bund: WID-SEC-2026-1405 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 05/06/2026 16:47
Updated: 05/19/2026 00:46
Changes: 05/06/2026 16:47 (58), 05/17/2026 14:14 (10), 05/19/2026 00:46 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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