We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.

Please see our statement on Data Privacy.

Zendesk (Helpdesk and Chat)
Ok

THREATINT
PUBLISHED

CVE-2021-22566

Incorrect mapping of Executable bits in Fuchsia Kernel

Reserved:2021-01-05
Published:2022-01-18
Updated:2024-05-15

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.


Problem types

CWE-275 Permission Issues

Product status

Default status
unaffected

Any version before 7d731b4e9599088ac3073956933559da7bca6a00
affected

References

https://fuchsia.googlesource.com/fuchsia/+/7d731b4e9599088ac3073956933559da7bca6a00

cve.org CVE-2021-22566

nvd.nist.gov CVE-2021-22566

Download JSON

Share this page
https://cve.threatint.com/CVE/CVE-2021-22566