CVE-2021-22556 json
Integer Overflow in Fuchsia Kernel
published 2022-05-03 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9697
- cvss
- 5.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 5%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 18 mo ago
Exploit prediction
0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.3 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Google LLC Fuchsia Kernel
Classification
- Weakness
-
- CWE-190 Integer Overflow or Wraparound
References
-
fuchsia-review.googlesource.com
/c/fuchsia/+/570881
issue-tracking, patch, third-party-advisory
-
fuchsia.dev
/whats-new/release-notes/f4-1
release-notes, vendor-advisory
Sources
- CVE List CVE-2021-22556
- NVD CVE-2021-22556
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