SB20260720174 - 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-2026-64064)

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_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.

Remediation

Install update from vendor's website.

References

• 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