Improper Initialization in Linux kernel - CVE-2026-64130
Published: July 20, 2026
Vulnerability identifier: #VU138513
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-64130
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to improper initialization of memory tags in the huge zero folio when allocating huge zero folios with init_on_free enabled and __GFP_ZEROTAGS handling skips tag clearing. A local user can map affected memory to disclose sensitive information.
The issue affects arm64 systems using memory tagging extension, and exposure occurs because the huge zero folio is mapped through a special PMD path that does not initialize tags on first user-space mapping.
How to mitigate CVE-2026-64130
Install security update from vendor's repository.