Integer overflow in Linux kernel - CVE-2026-64283
Published: July 27, 2026
Vulnerability identifier: #VU139712
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64283
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to bypass a file size check.
The vulnerability exists due to an integer overflow in the KVM guest_memfd memslot binding logic when binding a memslot to a guest_memfd file. A local user can supply a crafted offset and size combination to bypass a file size check.
The issue affects the sum of the offset and size values, where a very large offset can cause the signed 64-bit result to become negative during validation.
Affected software
Linux kernel
How to mitigate CVE-2026-64283
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3