CVE-2021-4218
MEDIUMCVSS 5.5/10EPSS 0.29%
Last modified
CVE-2021-4218 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in the Linux kernel’s implementation of reading the SVC RDMA counters. Reading the counter sysctl panics the system. EPSS estimates a 0.29% chance of exploitation in the next 30 days.
Description
A flaw was found in the Linux kernel’s implementation of reading the SVC RDMA counters. Reading the counter sysctl panics the system. This flaw allows a local attacker with local access to cause a denial of service while the system reboots. The issue is specific to CentOS/RHEL.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | All versions |
References
- https://access.redhat.com/security/cve/CVE-2021-4218Third Party Advisory
- https://bugs.centos.org/view.php?id=18395Exploit, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2048359Issue Tracking, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-4218Third Party Advisory
- https://bugs.centos.org/view.php?id=18395Exploit, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2048359Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-4218?
A flaw was found in the Linux kernel’s implementation of reading the SVC RDMA counters. Reading the counter sysctl panics the system. This flaw allows a local attacker with local access to cause a denial of service while the system reboots. The issue is specific to CentOS/RHEL.
How severe is CVE-2021-4218?
CVE-2021-4218 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.
How do I fix CVE-2021-4218?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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.
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Are you affected by CVE-2021-4218?
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