CVE-2021-22556
Last modified
CVE-2021-22556 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fuchsia | < 4.1 |
References
- https://fuchsia-review.googlesource.com/c/fuchsia/+/570881Issue Tracking, Patch, Third Party Advisory
- https://fuchsia.dev/whats-new/release-notes/f4-1Release Notes, Vendor Advisory
- https://fuchsia-review.googlesource.com/c/fuchsia/+/570881Issue Tracking, Patch, Third Party Advisory
- https://fuchsia.dev/whats-new/release-notes/f4-1Release Notes, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-22556?
How severe is CVE-2021-22556?
How do I fix CVE-2021-22556?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-22549An attacker can modify the address to point to trusted memor…7.8
- CVE-2021-2255Vulnerability in the Oracle Service Contracts product of Ora…8.1
- CVE-2021-22550An attacker can modify the pointers in enclave memory to ove…7.8
- CVE-2021-22552An untrusted memory read vulnerability in Asylo versions up …5.5
- CVE-2021-22553Any git operation is passed through Jetty and a session is c…7.5
- CVE-2021-22555A heap out-of-bounds write affecting Linux since v2.6.19-rc1…7.8
- CVE-2021-22557SLO generator allows for loading of YAML files that if craft…7.8
- CVE-2021-2256Vulnerability in the Oracle Storage Cloud Software Appliance…10
- CVE-2021-22563Invalid JPEG XL images using libjxl can cause an out of boun…4.4
- CVE-2021-22564For certain valid JPEG XL images with a size slightly larger…5.5
- CVE-2021-22565An attacker could prematurely expire a verification code, ma…6.5
- CVE-2021-22566An incorrect setting of UXN bits within mmu_flags_to_s1_pte_…9.8
Are you affected by CVE-2021-22556?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST