Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fuchsia | - |
Related Weaknesses (CWE)
References
- https://fuchsia.googlesource.com/fuchsia/+/7d731b4e9599088ac3073956933559da7bca6Mailing ListPatchThird Party Advisory
- https://fuchsia.googlesource.com/fuchsia/+/7d731b4e9599088ac3073956933559da7bca6Mailing ListPatchThird Party Advisory
FAQ
What is CVE-2021-22566?
CVE-2021-22566 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 by...
How severe is CVE-2021-22566?
CVE-2021-22566 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-22566?
Check the references section above for vendor advisories and patch information. Affected products include: Google Fuchsia.