SB2026091275 - Missing Release of Resource after Effective Lifetime in Linux kernel nfs_common

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-89715)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource release in nfs_open_local_fh() when racing nfs_uuid_add_file() with nfs_uuid_put() teardown. A local user can trigger the race while opening a local file handle to cause a denial of service.

The failure path leaks nfsd_file and nfsd_net references, which can block nfsd_net and network namespace teardown.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5215e734bf7cba18237155f8cb2a0accb60ca339
• https://git.kernel.org/stable/c/9f59b05423ed381f8cdeaaae4bd6778adcb6865c
• https://git.kernel.org/stable/c/ca018c19e0ba38975e5ddc3ef8117d5b734313aa