PT-2024-11127 · Linux · Linux Kernel

Claire Chang · Published 2021-04-12 · Updated 2025-01-10 · CVE-2021-47027

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 kernel crash that occurs when the firmware for the mt7921 device fails to download or is missing. This results in a fatal exception and the kernel stopping secondary CPUs. The crash is triggered by an internal error in the free msi irqs function, which is part of the PCI MSI (Message Signaled Interrupts) handling code. The error is caused by a bug in the mt7921 pci probe function, which is responsible for probing the mt7921 device. The pci disable msi and pci free irq vectors functions are also involved in the call trace leading to the crash.

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

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2025-07249

CVE-2021-47027

Affected Products

Linux Kernel

References · 14

• https://nvd.nist.gov/vuln/detail/CVE-2021-47027 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47027 · Vendor Advisory
• https://git.kernel.org/stable/c/a46b536cd60c0dbd4bf767c62a8774dec52bf099 · Patch
• https://bdu.fstec.ru/vul/2025-07249 · Security Note
• https://ubuntu.com/security/CVE-2021-47027 · Vendor Advisory
• https://git.kernel.org/stable/c/e230f0c44f011f3270680a506b19b7e84c5e8923 · Patch
• https://cve.org/CVERecord?id=CVE-2021-47027 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47027 · Vendor Advisory
• https://git.kernel.org/linus/e230f0c44f011f3270680a506b19b7e84c5e8923 · Note
• https://lore.kernel.org/linux-cve-announce/2024022834-CVE-2021-47027-4a56@gregkh/T/#u · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.4 · Note
• https://lore.kernel.org/linux-cve-announce/2024022834-CVE-2021-47027-4a56@gregkh · Note
• https://twitter.com/CVEnew/status/1762754401696125158 · Twitter Post
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47027 · Note