Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64059

Vulnerability identifier: #VU138577

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-64059

CWE-ID: CWE-664

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• 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

• Improper control of a resource through its lifetime in Linux kernel trace events
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia