PT-2021-8256 · Linux+1 · Linux Kernel+1

Syzbot · Published 2021-05-17 · Updated 2024-11-07 · CVE-2021-47225

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 AP/VLAN handling. When AP VLAN interfaces are up and the AP interface they belong to is closed, a deadlock occurs because the wiphy mutex is held during the dev close() operation, which then tries to acquire the wiphy mutex again through the netdev notifier in cfg80211. To resolve this, two actions are necessary: preventing changes to iftype while AP VLANs are up, and moving the dev close() loop over VLANs out of the wiphy mutex section during the normal stop case.

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

Improper Locking

Weakness Enumeration

CWE-667

CWE-833

Related Identifiers

BDU:2025-00794

CVE-2021-47225

Affected Products

Astra Linux

Linux Kernel

References · 14

• https://bdu.fstec.ru/vul/2025-00794 · Security Note
• https://git.kernel.org/stable/c/d5befb224edbe53056c2c18999d630dafb4a08b9 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47225 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-47225 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47225 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47225 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se81-bulletin-20241206SE81 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47225 · Vendor Advisory
• https://git.kernel.org/stable/c/8043903fcb72f545c52e3ec74d6fd82ef79ce7c5 · Patch
• https://ubuntu.com/security/CVE-2021-47225 · Vendor Advisory
• https://access.redhat.com/security/cve/CVE-2021-47225 · Note
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d5befb224edbe53056c2c18999d630dafb4a08b9 · Note
• https://git.kernel.org/linus/d5befb224edbe53056c2c18999d630dafb4a08b9 · Note
• https://t.me/cvenotify/100942 · Telegram Post