Skip to content
Fencer Vulns
low 2.0

CVE-2026-52791 json

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

published 2026-07-29 3 mo ago modified 2026-10-24 16 d ago also EUVD-2026-50403

cvss
2.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

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.

Patch / fix

  • fuse-overlayfs hummingbird 1 1.17-1.hum1

red hat advisories RHSA-2026:52805

  • fuse-overlayfs SLE Module for Containers 15 SP7, SLE Micro 5.5, SLE Micro 5.4 +2 more 1.1.2-150100.3.14.1
  • fuse-overlayfs SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.15-160000.3.1
  • fuse-overlayfs Linux Micro 6.0 1.12-2.1

suse advisories SUSE-SU-2026:4026-1SUSE-SU-2026:23469-1SUSE-SU-2026:23618-1SUSE-SU-2026:23252-1

  • fuse-overlayfs openSUSE Leap 16.0 1.15-160000.3.1
  • fuse-overlayfs openSUSE Tumbleweed 1.17-1.1

opensuse advisories openSUSE-SU-2026:21753-1openSUSE-SU-2026:11461-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-52791 updated cvss 4.7

fuse-overlayfs: fuse-overlayfs: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation

  • Red Hat Enterprise Linux 8 fuse-overlayfs Red Hat Enterprise Linux 9 fuse-overlayfs 1.14-2.el10 Red Hat Enterprise Linux 10 fuse-overlayfs 1.14-2.el10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 4 fuse-overlayfs, fuse-overlayfs 1.14-2.el10, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images fuse-overlayfs 1.17-1.hum1
    fixed: vendor fix RHSA-2026:52805

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 2.0 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CNA 4.0 2.0 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • containers fuse-overlayfs

Classification

Weakness
  • CWE-266 Incorrect Privilege Assignment

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.