PT-2022-4543 · Linux · Linux Kernel

Wade Mealing · Published 2022-01-31 · Updated 2022-08-30 · CVE-2021-4218

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw was found in the Linux kernel’s implementation of reading the SVC RDMA counters. Reading the counter sysctl panics the system, allowing a local attacker with local access to cause a denial of service while the system reboots. The issue is specific to CentOS/RHEL.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Access of Uninitialized Pointer

Improper Initialization

Weakness Enumeration

CWE-824

CWE-665

Related Identifiers

BDU:2022-05413

CVE-2021-4218

Affected Products

Linux Kernel

References · 16

• 🔥 https://bugs.centos.org/view.php?id=18395 · Exploit
• https://bdu.fstec.ru/vul/2022-05413 · Security Note
• https://wiki.astralinux.ru/astra-linux-se81-bulletin-20241206SE81 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-4218 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-4218 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-4218 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-4218 · Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2048359 · Note
• https://cnx-software.com/html/Linux-5.9-Changelog.txt · Note
• https://vulners.com/redhatcve/RH:CVE-2021-4218 · Note
• https://access.redhat.com/security/cve/cve-2021-4218 · Note
• https://t.me/cibsecurity/48669 · Telegram Post
• https://t.me/cvenotify/35451 · Telegram Post
• https://access.redhat.com/security/cve/CVE-2021-4218 · Note
• https://lore.kernel.org/mm-commits/[e-mail] · Note