CVE-2019-20908

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.

• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlMailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/20/6Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/30/2Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/30/3Mailing List, Third Party Advisory
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4Release Notes, Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06ePatch, Vendor Advisory
• https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.shPatch, Third Party Advisory
• https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.htmlMailing List, Third Party Advisory
• https://usn.ubuntu.com/4426-1/Third Party Advisory
• https://usn.ubuntu.com/4427-1/Third Party Advisory
• https://usn.ubuntu.com/4439-1/Third Party Advisory
• https://usn.ubuntu.com/4440-1/Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.htmlMailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/20/6Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/29/3Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/30/2Mailing List, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2020/07/30/3Mailing List, Third Party Advisory
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4Release Notes, Vendor Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06ePatch, Vendor Advisory
• https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.shPatch, Third Party Advisory
• https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.htmlMailing List, Third Party Advisory
• https://usn.ubuntu.com/4426-1/Third Party Advisory
• https://usn.ubuntu.com/4427-1/Third Party Advisory
• https://usn.ubuntu.com/4439-1/Third Party Advisory
• https://usn.ubuntu.com/4440-1/Third Party Advisory

Published

Jul 15, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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