SB2026072070 - Improper control of a resource through its lifetime in Linux kernel netfs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-64158)

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 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.

Remediation

Install update from vendor's website.

References

• 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