Vulnerability in Google Fuchsia
CVE-2021-22566
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (19.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Google Fuchsia
- Google Llc Fuchsia — versions 0
Weakness classification (CWE)
References
- fuchsia.googlesource.com/fuchsia/+/7d731b4e9599088ac3073956933559da7bca6a00 (Patch, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-22566?
- CVE-2021-22566 is a critical-severity vulnerability in Google Fuchsia, classified under Permission Issues. CVSS score: 9.8/10. Published 2022-01-18.
- How severe is CVE-2021-22566?
- Critical severity. CVSS v3 base score is 9.8 out of 10.