CVE-2021-4218

low-risk

Published 2022-08-24

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.

Do I need to act?

0.04% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.5/10 Medium

LOCAL / LOW complexity

Affected Products (1)

Linux Kernel

Affected Vendors

Linux

References (6)

Third Party Advisory https://access.redhat.com/security/cve/CVE-2021-4218

Exploit https://bugs.centos.org/view.php?id=18395

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2048359

Third Party Advisory https://access.redhat.com/security/cve/CVE-2021-4218

Exploit https://bugs.centos.org/view.php?id=18395

Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=2048359

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low-risk

Severity 18/34 · Moderate

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal