CVE-2026-43193: nfsd: fix nfs4_file refcount leak in nfsd_get_dir_deleg()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-06 · updated 2026-06-17

Description

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.

Affected products

Linux kernel: from 6.19 before 6.19.6 — fixed in 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 6.19.6. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/0d8362e15aad5b5c1d6a65bb23ac6c45ccf881f3
https://git.kernel.org/stable/c/789477b849394afdb60507924d65f7ef18f078ce

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