SB20260727319 - Integer overflow in Linux kernel fuse

Description

This security bulletin contains information about 1 vulnerability.

1) Integer overflow (CVE-ID: CVE-2026-64267)

CWE-ID: CWE-190 - Integer overflow

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 an integer overflow in fuse_notify_prune() in the FUSE notification handling code when processing a crafted FUSE_NOTIFY_PRUNE notification on 32-bit kernels. A local user can send a specially crafted prune notification with a wrapped count value to cause a denial of service.

Exploitation requires a FUSE daemon capable of issuing crafted prune notifications, and the issue affects 32-bit kernel builds.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/54243797cedf55447b4c5d560e8cd709900061ae
• https://git.kernel.org/stable/c/6e2d84fdeac05bfd858e84a76353fdb84f23a43e
• https://git.kernel.org/stable/c/c78c4b242299bc581e4987e5c2786c6f4760c516