CVE-2026-52791
LowCVSS 2.0Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
fuse-overlayfs before version 1.17 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.
Risk Assessment
A low-privileged attacker can obtain a file with SUID/SGID permissions, potentially leading to privilege escalation in rootless containers.
Recommendation
Update fuse-overlayfs to version 1.17 or later, which removes the preservation of SUID and SGID bits in these operations.
Original NVD description (English source)
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.