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kernel: lockdown: bypass through ACPI write via efivar_ssdt

🗓️ 29 Jul 2020 18:34:17Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 14 Views

Root user can bypass kernel lockdown via ACPI write with efivar_ssdt, risking confidentiality, integrity, and availability.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.2aarch64bpftool4.18.0-193.14.3.el8_2bpftool-4.18.0-193.14.3.el8_2.aarch64.rpm
Red Hat Enterprise Linux8.2ppc64lebpftool4.18.0-193.14.3.el8_2bpftool-4.18.0-193.14.3.el8_2.ppc64le.rpm
Red Hat Enterprise Linux8.2s390xbpftool4.18.0-193.14.3.el8_2bpftool-4.18.0-193.14.3.el8_2.s390x.rpm
Red Hat Enterprise Linux8.2x86_64bpftool4.18.0-193.14.3.el8_2bpftool-4.18.0-193.14.3.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2aarch64bpftool-debuginfo4.18.0-193.14.3.el8_2bpftool-debuginfo-4.18.0-193.14.3.el8_2.aarch64.rpm
Red Hat Enterprise Linux8.2ppc64lebpftool-debuginfo4.18.0-193.14.3.el8_2bpftool-debuginfo-4.18.0-193.14.3.el8_2.ppc64le.rpm
Red Hat Enterprise Linux8.2s390xbpftool-debuginfo4.18.0-193.14.3.el8_2bpftool-debuginfo-4.18.0-193.14.3.el8_2.s390x.rpm
Red Hat Enterprise Linux8.2x86_64bpftool-debuginfo4.18.0-193.14.3.el8_2bpftool-debuginfo-4.18.0-193.14.3.el8_2.x86_64.rpm
Red Hat Enterprise Linux8.2aarch64kernel4.18.0-193.14.3.el8_2kernel-4.18.0-193.14.3.el8_2.aarch64.rpm
Red Hat Enterprise Linux8.2ppc64lekernel4.18.0-193.14.3.el8_2kernel-4.18.0-193.14.3.el8_2.ppc64le.rpm
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28 Jun 2026 12:33Current
7.1High risk
Vulners AI Score7.1
CVSS 3.16.7
CVSS 26.9
EPSS0.00536
14