Vulnerability · Published Jan 18, 2022 · Assigned by Google
CVE-2021-22566Incorrect mapping of Executable bits in Fuchsia Kernel
Medium 5.1
In plain English
A medium-severity security flaw in Fuchsia from Google LLC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Google LLC | Fuchsia | 0 – before 7d731b4e9599088ac3073956933559da7bca6a00 |
Weakness: CWE-275 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N