PT-2024-11060 · Linux+7 · Linux Kernel+7

Konstantin Kharlamov + 1 · Published 2021-04-30 · Updated 2024-09-17 · CVE-2021-46939

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 vulnerability in the Linux kernel has been resolved, related to the tracing feature. The issue occurred when a fix to the ring buffer recursion detection caused a hung machine during suspend/resume testing. The problem arose from the trace clock global() function taking a spin lock and then trying to take it again, resulting in a dead lock. To address this, the trace clock global() code was restructured to never block, using a trylock to grab the lock for updating the prev time and retrying if it fails.

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

Exploit

Resource Exhaustion

Weakness Enumeration

CWE-662

CWE-833

CWE-400

Related Identifiers

ALSA-2024:5101

ALSA-2024:5102

BDU:2025-02866

CESA-2024_5101

CESA-2024_5102

CVE-2021-46939

INFSA-2024_5101

INFSA-2024_5102

OPENSUSE-SU-2024_1489-1

RHSA-2024:5101

RHSA-2024:5102

RHSA-2024_5101

RHSA-2024_5102

RLSA-2024:5101

RLSA-2024:5102

RXSA-2024:5101

SUSE-SU-2024:1454-1

SUSE-SU-2024:1465-1

SUSE-SU-2024:1489-1

SUSE-SU-2024:1643-1

SUSE-SU-2024:1646-1

SUSE-SU-2024:1870-1

USN-6778-1

Affected Products

Almalinux

Astra Linux

Centos

Linux Kernel

Red Hat

Rocky Linux

Suse

Ubuntu

References · 1137

• 🔥 https://github.com/benschlueter/CVE-2021-29155 · Exploit
• 🔥 https://github.com/Kakashiiiiy/CVE-2021-29155 · Exploit
• https://git.kernel.org/stable/c/c64da3294a7d59a4bf6874c664c13be892f15f44 · Patch
• https://ubuntu.com/security/CVE-2024-26805 · Vendor Advisory
• https://git.kernel.org/stable/c/859b47a43f5a0e5b9a92b621dc6ceaad39fb5c8b · Patch
• https://osv.dev/vulnerability/ALSA-2024:5101 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:1646-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-46939 · Security Note
• https://git.kernel.org/stable/c/91ca6f6a91f679c8645d7f3307e03ce86ad518c4 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:1454-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-46939 · Security Note
• https://ubuntu.com/security/CVE-2024-26622 · Vendor Advisory
• https://git.kernel.org/stable/c/1fca00920327be96f3318224f502e4d5460f9545 · Patch
• https://ubuntu.com/security/notices/USN-6778-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-52530 · Vendor Advisory