Bug 2363498 (CVE-2022-49876)

Summary: CVE-2022-49876 kernel: wifi: mac80211: fix general-protection-fault in ieee80211_subif_start_xmit()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-01 15:07:10 UTC
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>

Comment 1 Avinash Hanwate 2025-05-02 05:08:45 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050152-CVE-2022-49876-498d@gregkh/T