SB20260720173 - 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-2026-64063)

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:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to corrupt file data.

The vulnerability exists due to improper state management in netfs_perform_write() when handling streaming writes that overwrite partially written folios. A local user can perform crafted write operations to corrupt file data.

The issue can be triggered on netfs-backed filesystems such as cifs with the default cache option, and was observed when a streaming write page is later overwritten entirely or partially by a single write().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/20195925c768626dc901a4781a51e508702c88ad
• https://git.kernel.org/stable/c/7b4dcf1b9455a6e52ac7478b4057dbe10359576d
• https://git.kernel.org/stable/c/cdae00e8e215d95911d95f100599e187b6560de5
• https://git.kernel.org/stable/c/ef9b521212e4863814ef7dfe19889abaf55ca840