TI-2021-05515 Aliases CVE-2021-22556 GHSA-cgfp-g9xr-gj33

Integer Overflow in Fuchsia Kernel

LOW 33CWE-190Published 2022-05-03 · Updated 2025-04-21

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00164 5th percentileScored 2026-11-07

Fix Fixed Fuchsia Kernel (Google LLC): 4.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Google	Fuchsia Kernel	before 4.1	4.1	Patch available	CNA

Fuchsia Kernel VendorGoogle Affected before 4.1 Fixed in 4.1 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:google:fuchsia::::::::	before 4.1	Vulnerable	Google

cpe:2.3:o:google:fuchsia:*:*:*:*:*:*:*:* Versions before 4.1 Vulnerable ·Google

Remediation

Fix · CNA Fuchsia Kernel (Google LLC) Fixed in 4.1

Timeline

2026-10-02 Threatist record created from CVE-2021-22556
2026-10-03 Alias added: GHSA-cgfp-g9xr-gj33

References

Patch 1

https://fuchsia-review.googlesource.com/c/fuchsia/+/570881

Advisory 1

https://fuchsia.dev/whats-new/release-notes/f4-1

TI-2022-00787 Illegal access to Kernel log in Fuchsia CVSS 3.1MEDIUM 5.5
TI-2024-09826 Identifiable Header Values In Fuchsia Leading To Tracking of The User CVSS 4.0MEDIUM 6.9
TI-2022-00182 Write access to VMO data through copy-on-write in Fuchsia CVSS 3.1HIGH 7.5
TI-2021-05520 Incorrect mapping of Executable bits in Fuchsia Kernel CVSS 4.0MEDIUM 5.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences