SB20260626169 - Use of uninitialized resource in Linux kernel fuse

Description

This security bulletin contains information about 1 vulnerability.

1) Use of uninitialized resource (CVE-ID: CVE-2026-53167)

CWE-ID: CWE-908 - Use of Uninitialized Resource

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an exposure of uninitialized memory in FUSE_NOTIFY_RETRIEVE in fs/fuse/dev.c when retrieving data from page cache folios. A local user can trigger FUSE_NOTIFY_RETRIEVE on a non-uptodate folio to disclose sensitive information.

This has security impact only on systems that do not enable automatic zero-initialization of page allocations.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1fb8735a3a4d894f8c1f90b741a3ab1d3817f9bd
• https://git.kernel.org/stable/c/4e3d1b2c48ca6c55f1e9ca7f8dccc76f120f276c
• https://git.kernel.org/stable/c/56763afa013444a9d84ca1b74e4b7130942177ba