SB20260720169 - Improper control of a resource through its lifetime in Linux kernel trace events

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-64059)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper state management in netfs_perform_write() when handling folio private data during buffered writes. A local user can trigger repeated writes that cause multiple private-data attachments and reference leaks to cause a denial of service.

The issue can leak folio references, netfs_folio structures, or netfs_group references under certain write-handling conditions.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0969ea8370bad0e4fb6131b6a7bed9e7ec522ac7
• https://git.kernel.org/stable/c/551b5c71ee312ca7646ddb605231c1016e8cbb18
• https://git.kernel.org/stable/c/7f040243c74d72b45b22246c7d9e621fbeab44ac
• https://git.kernel.org/stable/c/ccde2ac757c713535b224233a296de40efe5212d