CVE-2026-52791fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)

Description

fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h
• https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f
• https://github.com/containers/fuse-overlayfs/releases/tag/v1.17