Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64064

Vulnerability identifier: #VU138582

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-2026-64064

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_invalidate_folio() when handling a folio that was dirtied by a streaming write and then truncated before being read via mmap(). A local user can truncate the file and trigger a subsequent mmap read to cause a kernel oops and denial of service.

Exploitation requires a local sequence involving streaming writes followed by truncation and mmap-based access.

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/156ac2ec2ee77c44c4eb7439d6d165247ba12247
• https://git.kernel.org/stable/c/31ba145faceb378fa01afcb8349e15ea7d95e542
• https://git.kernel.org/stable/c/65ae8717abf36202fef02260b64b781d2d44a9bf
• https://git.kernel.org/stable/c/fb6ec883b48b8789e5e690dcd440d2db941e840c

• 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