High severity · published May 3, 2022
CVE-2021-22556
The Security Team discovered an integer overflow bug that allows an attacker with code execution to issue memory cache invalidation operations on pages that they don’t own,…
7.8
CVSS
0.2%
EPSS
No
On KEV
Description
The Security Team discovered an integer overflow bug that allows an attacker with code execution to issue memory cache invalidation operations on pages that they don’t own, allowing them to control kernel memory from userspace. We recommend upgrading to kernel version 4.1 or beyond.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FU
Fuchsia · Google
before 4.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-22556
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-22556
Issue Tracking
https://fuchsia-review.googlesource.com/c/fuchsia/+/570881
Release Notes
https://fuchsia.dev/whats-new/release-notes/f4-1
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