PT-2021-8254 · Linux+1 · Linux Kernel+1

Pawel Laszczak · Published 2021-04-26 · Updated 2024-11-04 · CVE-2021-47271

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 The issue is related to a deadlock in the Linux kernel, specifically in the cdnsp thread irq handler function. The root cause is the use of spin lock and spin unlock instructions instead of spin lock irqsave and spin lock irqrestore. This can lead to a non-responsive CSD lock, causing the system to become unresponsive. The vulnerability can be exploited to cause a denial of service.

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

Improper Resource Release

Improper Locking

Weakness Enumeration

CWE-404

CWE-667

Related Identifiers

BDU:2025-00792

CVE-2021-47271

Affected Products

Astra Linux

Linux Kernel

References · 12

• https://git.kernel.org/stable/c/ae746b6f4ce619cf4032fd798a232b010907a397 · Patch
• https://git.kernel.org/stable/c/a9aecef198faae3240921b707bc09b602e966fce · Patch
• https://cve.org/CVERecord?id=CVE-2021-47271 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-47271 · Security Note
• https://bdu.fstec.ru/vul/2025-00792 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47271 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se81-bulletin-20241206SE81 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47271 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47271 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47271 · Vendor Advisory
• https://git.kernel.org/linus/a9aecef198faae3240921b707bc09b602e966fce · Note
• https://twitter.com/CVEnew/status/1792928020946198934 · Twitter Post