Vulnerability Details : 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, allowing them to control kernel memory from userspace. We recommend upgrading to kernel version 4.1 or beyond.
Vulnerability category: Overflow
Products affected by CVE-2021-22556
- cpe:2.3:o:google:fuchsia:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-22556
0.02%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 2 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-22556
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
5.3
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N |
1.0
|
4.2
|
Google Inc. | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2021-22556
-
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by:
- cve-coordination@google.com (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2021-22556
-
https://fuchsia-review.googlesource.com/c/fuchsia/+/570881
Issue Tracking;Patch;Third Party Advisory
-
https://fuchsia.dev/whats-new/release-notes/f4-1
Fuchsia F4.1 release notesRelease Notes;Vendor Advisory
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