CVE-2026-52791

Summary

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.

Affected Software

Weaknesses

• CWE-266: CWE-266: Incorrect Privilege Assignment

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h

References

• 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

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