CVE-2021-22566: Incorrect mapping of Executable bits in Fuchsia Kernel
First published: Tue Jan 18 2022(Updated: )
An incorrect setting of UXN bits within mmu_flags_to_s1_pte_attr lead to privileged executable pages being mapped as executable from an unprivileged context. This can be leveraged by an attacker to bypass executability restrictions of kernel-mode pages from user-mode. An incorrect setting of PXN bits within mmu_flags_to_s1_pte_attr lead to unprivileged executable pages being mapped as executable from a privileged context. This can be leveraged by an attacker to bypass executability restrictions of user-mode pages from kernel-mode. Typically this allows a potential attacker to circumvent a mitigation, making exploitation of potential kernel-mode vulnerabilities easier. We recommend updating kernel beyond commit 7d731b4e9599088ac3073956933559da7bca6a00 and rebuilding.
Credit: cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Google Fuchsia |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-22566.
What is the severity of CVE-2021-22566?
CVE-2021-22566 has a severity of critical with a score of 9.8.
What is the description of CVE-2021-22566?
CVE-2021-22566 is a vulnerability where an incorrect setting of UXN bits within mmu_flags_to_s1_pte_attr leads to privileged executable pages being mapped as executable from an unprivileged context, allowing attackers to bypass executability restrictions of kernel-mode pages from user-mode.
What software is affected by CVE-2021-22566?
The affected software is Google Fuchsia.
Is there a fix available for CVE-2021-22566?
Please refer to the provided reference link for information on the fix for CVE-2021-22566.
- collector/nvd-index
- agent/weakness
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/remedy
- agent/title
- agent/author
- agent/references
- agent/last-modified-date
- agent/description
- agent/event
- agent/first-publish-date
- agent/tags
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- vendor/google
- canonical/google fuchsia