Linux Kernel up to 6.19.5 nfsd nfsd_get_dir_deleg 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, which was classified as critical, was found in Linux Kernel up to 6.19.5. This affects the function nfsd_get_dir_deleg of the component nfsd. Executing a manipulation can lead to reference count. This vulnerability appears as CVE-2026-43193. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 6.19.5. This vulnerability affects the function nfsd_get_dir_deleg of the component nfsd. The manipulation with an unknown input leads to a reference count vulnerability. The CWE definition for the vulnerability is CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix nfs4_file refcount leak in nfsd_get_dir_deleg() Claude pointed out that there is a nfs4_file refcount leak in nfsd_get_dir_deleg(). Ensure that the reference to "fp" is released before returning.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-43193 since 05/01/2026. There are known technical details, but no exploit is available.

Upgrading to version 6.19.6 eliminates this vulnerability. Applying the patch 0d8362e15aad5b5c1d6a65bb23ac6c45ccf881f3/789477b849394afdb60507924d65f7ef18f078ce 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.

Once again VulDB remains the best source for vulnerability data.

Productinfo

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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: 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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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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.19.6
Patch: 0d8362e15aad5b5c1d6a65bb23ac6c45ccf881f3/789477b849394afdb60507924d65f7ef18f078ce

Timelineinfo

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

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43193 (🔒)
GCVE (CVE): GCVE-0-2026-43193
GCVE (VulDB): GCVE-100-361468

Entryinfo

Created: 05/06/2026 16:49
Changes: 05/06/2026 16:49 (59)
Complete: 🔍
Cache ID: 216::103

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