CVE-2022-49876: wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit()
First published: Thu May 01 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit() When device is running and the interface status is changed, the gpf issue is triggered. The problem triggering process is as follows: Thread A: Thread B ieee80211_runtime_change_iftype() process_one_work() ... ... ieee80211_do_stop() ... ... ... sdata->bss = NULL ... ... ieee80211_subif_start_xmit() ieee80211_multicast_to_unicast //!sdata->bss->multicast_to_unicast cause gpf issue When the interface status is changed, the sending queue continues to send packets. After the bss is set to NULL, the bss is accessed. As a result, this causes a general-protection-fault issue. The following is the stack information: general protection fault, probably for non-canonical address 0xdffffc000000002f: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000178-0x000000000000017f] Workqueue: mld mld_ifc_work RIP: 0010:ieee80211_subif_start_xmit+0x25b/0x1310 Call Trace: <TASK> dev_hard_start_xmit+0x1be/0x990 __dev_queue_xmit+0x2c9a/0x3b60 ip6_finish_output2+0xf92/0x1520 ip6_finish_output+0x6af/0x11e0 ip6_output+0x1ed/0x540 mld_sendpack+0xa09/0xe70 mld_ifc_work+0x71c/0xdb0 process_one_work+0x9bf/0x1710 worker_thread+0x665/0x1080 kthread+0x2e4/0x3a0 ret_from_fork+0x1f/0x30 </TASK>
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.19<6.0.9 | |
| Linux Kernel | =6.1-rc1 | |
| Linux Kernel | =6.1-rc2 | |
| Linux Kernel | =6.1-rc3 | |
| Linux Kernel | =6.1-rc4 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2022-49876?
CVE-2022-49876 has been classified as a moderate severity vulnerability due to the potential for a general protection fault.
How do I fix CVE-2022-49876?
To fix CVE-2022-49876, update the Linux kernel to the latest stable version where this vulnerability has been addressed.
What systems are affected by CVE-2022-49876?
CVE-2022-49876 affects the Linux kernel and can impact any system running this software.
What happens if CVE-2022-49876 is exploited?
Exploiting CVE-2022-49876 can lead to a general protection fault, potentially causing a system crash or instability.
Is there a workaround for CVE-2022-49876?
Currently, the preferred method to address CVE-2022-49876 is to apply the kernel updates that resolve the vulnerability.
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