SB20260727301 - Integer overflow in Linux kernel kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-64283)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/eba85fee7fc6cf28fec38a5bf3c378bef9a79ca6
• https://git.kernel.org/stable/c/f3a98d5881b9bd4807f49156143565f6aabcef1e