Linux Kernel up to 6.0.6 mmc sdio_init_func reference count

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

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.0.6. Affected is the function sdio_init_func of the component mmc. Performing a manipulation results in reference count. This vulnerability is known as CVE-2022-50640. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.0.6. It has been classified as critical. This affects the function sdio_init_func of the component mmc. The manipulation with an unknown input leads to a reference count vulnerability. CWE is classifying the issue as CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: mmc: core: Fix kernel panic when remove non-standard SDIO card SDIO tuple is only allocated for standard SDIO card, especially it causes memory corruption issues when the non-standard SDIO card has removed, which is because the card device's reference counter does not increase for it at sdio_init_func(), but all SDIO card device reference counter gets decreased at sdio_release_func().

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2022-50640 since 12/09/2025. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 278088 (Linux Distros Unpatched Vulnerability : CVE-2022-50640), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.9.332, 4.14.298, 4.19.264, 5.4.223, 5.10.153, 5.15.77 or 6.0.7 eliminates this vulnerability. Applying the patch b8b2965932e702b21e335ff30e1bb550f5a23b6f/b3275dde570b6420106a715bb58a0af041b94d95/1fb79478695d92bab1c120ad3dad05252b02a29d/7a09c64b7da0abdec3919812e3d93ecc44069ed0/8bf037279b5869ae9331c42bb1527d2680ebba96/1e8cd93ae536581562bab4e1d8c5315bbc2548bf/66d461a92f32b6995b630625d350259b6b1f961b/9972e6b404884adae9eec7463e30d9b3c9a70b18 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 (278088) and CERT Bund (WID-SEC-2025-2765). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky 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: Reference count
CWE: CWE-911 / CWE-664
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: 278088
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2022-50640

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.9.332/4.14.298/4.19.264/5.4.223/5.10.153/5.15.77/6.0.7
Patch: b8b2965932e702b21e335ff30e1bb550f5a23b6f/b3275dde570b6420106a715bb58a0af041b94d95/1fb79478695d92bab1c120ad3dad05252b02a29d/7a09c64b7da0abdec3919812e3d93ecc44069ed0/8bf037279b5869ae9331c42bb1527d2680ebba96/1e8cd93ae536581562bab4e1d8c5315bbc2548bf/66d461a92f32b6995b630625d350259b6b1f961b/9972e6b404884adae9eec7463e30d9b3c9a70b18

Timelineinfo

12/09/2025 Advisory disclosed
12/09/2025 +0 days CVE reserved
12/09/2025 +0 days VulDB entry created
03/28/2026 +109 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2022-50640 (🔒)
GCVE (CVE): GCVE-0-2022-50640
GCVE (VulDB): GCVE-100-334905
CERT Bund: WID-SEC-2025-2765 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/09/2025 07:42
Updated: 03/28/2026 21:21
Changes: 12/09/2025 07:42 (59), 12/11/2025 14:11 (2), 03/28/2026 21:21 (7)
Complete: 🔍
Cache ID: 216:2A8:103

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