CVE-2021-22556 json
Integer Overflow in Fuchsia Kernel
published 4y ago modified 4mo 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
Is CVE-2021-22556 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-09).
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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