In the Linux kernel, the following vulnerability has been resolved:
mac80211: fix deadlock in AP/VLAN handling
Syzbot reports that when you have AP_VLAN interfaces that are up
and close the AP interface they belong to, we get a deadlock. No
surprise - since we dev_close() them with the wiphy mutex held,
which goes back into the netdev notifier in cfg80211 and tries to
acquire the wiphy mutex there.
To fix this, we need to do two things:
1) prevent changing iftype while AP_VLANs are up, we can't
easily fix this case since cfg80211 already calls us with
the wiphy mutex held, but change_interface() is relatively
rare in drivers anyway, so changing iftype isn't used much
(and userspace has to fall back to down/change/up anyway)
2) pull the dev_close() loop over VLANs out of the wiphy mutex
section in the normal stop case
References
Configurations
Configuration 1 (hide)
|
History
04 Apr 2025, 14:31
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* |
|
| CWE | CWE-667 | |
| References | () https://git.kernel.org/stable/c/8043903fcb72f545c52e3ec74d6fd82ef79ce7c5 - Patch | |
| References | () https://git.kernel.org/stable/c/d5befb224edbe53056c2c18999d630dafb4a08b9 - Patch |
Information
Published : 2024-05-21 15:15
Updated : 2025-04-04 14:31
NVD link : CVE-2021-47225
Mitre link : CVE-2021-47225
CVE.ORG link : CVE-2021-47225
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-667
Improper Locking