Bug 2373675 (CVE-2022-50187)

Summary:	CVE-2022-50187 kernel: ath11k: fix netdev open race
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dfreiber, drow, jburrell, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-06-18 12:13:21 UTC

In the Linux kernel, the following vulnerability has been resolved:

ath11k: fix netdev open race

Make sure to allocate resources needed before registering the device.

This specifically avoids having a racing open() trigger a BUG_ON() in
mod_timer() when ath11k_mac_op_start() is called before the
mon_reap_timer as been set up.

I did not see this issue with next-20220310, but I hit it on every probe
with next-20220511. Perhaps some timing changed in between.

Here's the backtrace:

[   51.346947] kernel BUG at kernel/time/timer.c:990!
[   51.346958] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
...
[   51.578225] Call trace:
[   51.583293]  __mod_timer+0x298/0x390
[   51.589518]  mod_timer+0x14/0x20
[   51.595368]  ath11k_mac_op_start+0x41c/0x4a0 [ath11k]
[   51.603165]  drv_start+0x38/0x60 [mac80211]
[   51.610110]  ieee80211_do_open+0x29c/0x7d0 [mac80211]
[   51.617945]  ieee80211_open+0x60/0xb0 [mac80211]
[   51.625311]  __dev_open+0x100/0x1c0
[   51.631420]  __dev_change_flags+0x194/0x210
[   51.638214]  dev_change_flags+0x24/0x70
[   51.644646]  do_setlink+0x228/0xdb0
[   51.650723]  __rtnl_newlink+0x460/0x830
[   51.657162]  rtnl_newlink+0x4c/0x80
[   51.663229]  rtnetlink_rcv_msg+0x124/0x390
[   51.669917]  netlink_rcv_skb+0x58/0x130
[   51.676314]  rtnetlink_rcv+0x18/0x30
[   51.682460]  netlink_unicast+0x250/0x310
[   51.688960]  netlink_sendmsg+0x19c/0x3e0
[   51.695458]  ____sys_sendmsg+0x220/0x290
[   51.701938]  ___sys_sendmsg+0x7c/0xc0
[   51.708148]  __sys_sendmsg+0x68/0xd0
[   51.714254]  __arm64_sys_sendmsg+0x28/0x40
[   51.720900]  invoke_syscall+0x48/0x120

Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3

Comment 1 Avinash Hanwate 2025-06-18 17:56:43 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025061835-CVE-2022-50187-ba19@gregkh/T