Improper control of a resource through its lifetime in Linux kernel - CVE-2026-64158

Vulnerability identifier: #VU138477

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-2026-64158

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 buffered writes on files opened for reading and writing. A local user can perform write operations that trigger write streaming disablement to cause a denial of service.

The issue is related to write streaming behavior in the netfs subsystem and was observed to cause failures in generic/522 xfstest scenarios.

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/616578e40dcba3f94810d841c5a52b7e3bc8ede7
• https://git.kernel.org/stable/c/70a7b9193bbbfceaab5974de66834c64ccc875dd
• https://git.kernel.org/stable/c/7a9fa5b020a3a40f8291a71cd44c08d931da430d
• https://git.kernel.org/stable/c/9adf8e47d73d5e3c2fe77dea649dcde350ccd65c

• Improper control of a resource through its lifetime in Linux kernel netfs
• 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