SB20260912111 - Improper resource shutdown or release in Linux kernel nfsd

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-89668)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to leave orphan debugfs files with stale file-operation pointers into freed module text.

The vulnerability exists due to improper cleanup in the nfsd initialization routine when nfsd4_init_slabs() fails after debugfs initialization. A local privileged user can trigger the affected initialization failure to leave orphan debugfs files with stale file-operation pointers into freed module text.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2c390c8a1764d67095fe444401861fac4c049362
• https://git.kernel.org/stable/c/4ae5d7490ae6a7b83b3d607f88c499f4f85e753a
• https://git.kernel.org/stable/c/ab43ff94f5dfc2b6a080b167b69855eb7655c98b