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CVE-2020-26541

Status Candidate

Overview

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c.

Related Files

Ubuntu Security Notice USN-5120-1
Posted Oct 22, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5120-1 - It was discovered that the f2fs file system in the Linux kernel did not properly validate metadata in some situations. An attacker could use this to construct a malicious f2fs image that, when mounted and operated on, could cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2019-19449, CVE-2020-26541, CVE-2020-36311, CVE-2021-22543, CVE-2021-3612, CVE-2021-3759, CVE-2021-38199, CVE-2021-38207, CVE-2021-40490
MD5 | 2b0bea3094eab3e20f9e8cd33f9618c3
Ubuntu Security Notice USN-5106-1
Posted Oct 7, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5106-1 - Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this to execute arbitrary code. It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure Boot Forbidden Signature Database protection mechanism. An attacker could use this to bypass UEFI Secure Boot restrictions. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-26541, CVE-2021-22543, CVE-2021-3612, CVE-2021-38160, CVE-2021-38199, CVE-2021-41073
MD5 | 44f1cb6d4e6bc787eb2a64281fc880a2
Ubuntu Security Notice USN-5070-1
Posted Sep 9, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5070-1 - Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory. Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host's physical memory. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2020-26541, CVE-2021-22543, CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656, CVE-2021-38198, CVE-2021-38200, CVE-2021-38206, CVE-2021-38207
MD5 | f73e3b6b69f5d871bd66cd0b99c3e764
Red Hat Security Advisory 2021-2438-01
Posted Jul 28, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2438-01 - Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. Issues addressed include bypass, code execution, denial of service, open redirection, resource exhaustion, and remote shell upload vulnerabilities.

tags | advisory, remote, denial of service, shell, vulnerability, code execution
systems | linux, redhat
advisories | CVE-2016-2183, CVE-2020-15106, CVE-2020-15112, CVE-2020-15113, CVE-2020-15114, CVE-2020-15136, CVE-2020-26160, CVE-2020-26541, CVE-2020-28469, CVE-2020-28500, CVE-2020-28852, CVE-2020-7774, CVE-2021-20206, CVE-2021-20271, CVE-2021-20291, CVE-2021-21419, CVE-2021-21623, CVE-2021-21639, CVE-2021-21640, CVE-2021-21648, CVE-2021-22133, CVE-2021-23337, CVE-2021-23362, CVE-2021-23368, CVE-2021-23382, CVE-2021-25735
MD5 | dda5a75b5b7fd18f58795ba51eeb6a02
Red Hat Security Advisory 2021-2718-01
Posted Jul 21, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2718-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include bypass and use-after-free vulnerabilities.

tags | advisory, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-25704, CVE-2020-26541, CVE-2020-35508, CVE-2021-33034, CVE-2021-33909
MD5 | 5f38708574d49f4b3e719572d35981c2
Red Hat Security Advisory 2021-2719-01
Posted Jul 21, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2719-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include bypass and use-after-free vulnerabilities.

tags | advisory, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-25704, CVE-2020-26541, CVE-2020-35508, CVE-2021-33034, CVE-2021-33909
MD5 | 7bd919699bb032098b268997050708d0
Red Hat Security Advisory 2021-2666-01
Posted Jul 7, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2666-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include bypass and use-after-free vulnerabilities.

tags | advisory, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-26541, CVE-2021-33034
MD5 | c455013238a5a919ec61ca4df18658a0
Red Hat Security Advisory 2021-2570-01
Posted Jun 30, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2570-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Issues addressed include bypass and use-after-free vulnerabilities.

tags | advisory, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-26541, CVE-2021-33034
MD5 | ff550194b07f6c2567a30d8dbd0834df
Red Hat Security Advisory 2021-2599-01
Posted Jun 29, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-2599-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include bypass and use-after-free vulnerabilities.

tags | advisory, kernel, vulnerability
systems | linux, redhat
advisories | CVE-2020-26541, CVE-2021-33034
MD5 | 949dbd9e710236aaadf373d409e03012
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