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kernel: FUSE filesystem low-privileged user privileges escalation

🗓️ 04 Apr 2023 09:08:03Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 11 Views

A Linux kernel flaw in OverlayFS allows a low-privilege user to escalate privileges by copying a capable setuid file with capabilities from a nosuid mount to another mount.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.7x86_64kernel-rt4.18.0-425.19.2.rt7.230.el8_7kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-core4.18.0-425.19.2.rt7.230.el8_7kernel-rt-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debug4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debug-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debug-core4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debug-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debug-debuginfo4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debug-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debug-devel4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debug-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debug-kvm4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debug-kvm-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debug-modules4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debug-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debug-modules-extra4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debug-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux8.7x86_64kernel-rt-debuginfo4.18.0-425.19.2.rt7.230.el8_7kernel-rt-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
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28 Jun 2026 12:38Current
6.7Medium risk
Vulners AI Score6.7
CVSS 3.17.8
EPSS0.0788
SSVC
CWE-282
linux kerneloverlayfsfuse filesystemsetuid executionuid mappingprivilege escalationnosuid mountlocal user
11