In the Linux kernel, the following vulnerability has been resolved:
wifi: mt76: mt7921: fix kernel panic due to null pointer dereference
Address a kernel panic caused by a null pointer dereference in the `mt792x_rx_get_wcid` function. The issue arises because the `deflink` structure is not properly initialized with the `sta` context. This patch ensures that the `deflink` structure is correctly linked to the `sta` context, preventing the null pointer dereference.
BUG: kernel NULL pointer dereference, address: 0000000000000400 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 0 UID: 0 PID: 470 Comm: mt76-usb-rx phy Not tainted 6.12.13-gentoo-dist #1 Hardware name: /AMD HUDSON-M1, BIOS 4.6.4 11/15/2011 RIP: 0010:mt792x_rx_get_wcid+0x48/0x140 [mt792x_lib] RSP: 0018:ffffa147c055fd98 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff8e9ecb652000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8e9ecb652000 RBP: 0000000000000685 R08: ffff8e9ec6570000 R09: 0000000000000000 R10: ffff8e9ecd2ca000 R11: ffff8e9f22a217c0 R12: 0000000038010119 R13: 0000000080843801 R14: ffff8e9ec6570000 R15: ffff8e9ecb652000 FS: 0000000000000000(0000) GS:ffff8e9f22a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000400 CR3: 000000000d2ea000 CR4: 00000000000006f0 Call Trace: <TASK> ? __die_body.cold+0x19/0x27 ? page_fault_oops+0x15a/0x2f0 ? search_module_extables+0x19/0x60 ? search_bpf_extables+0x5f/0x80 ? exc_page_fault+0x7e/0x180 ? asm_exc_page_fault+0x26/0x30 ? mt792x_rx_get_wcid+0x48/0x140 [mt792x_lib] mt7921_queue_rx_skb+0x1c6/0xaa0 [mt7921_common] mt76u_alloc_queues+0x784/0x810 [mt76_usb] ? __pfx___mt76_worker_fn+0x10/0x10 [mt76] __mt76_worker_fn+0x4f/0x80 [mt76] kthread+0xd2/0x100 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> ---[ end trace 0000000000000000 ]---
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Suse | — | Upgrade kernel-azureUpgrade kernel-default-livepatchUpgrade kernel-default-vdsoUpgrade kernel-develUpgrade kernel-kvmsmall-develUpgrade kernel-source-azureUpgrade kernel-sourceUpgrade kernel-64kbUpgrade kernel-default-develUpgrade kernel-devel-azureUpgrade kernel-64kb-extraUpgrade kernel-64kb-develUpgrade kernel-source-vanillaUpgrade kernel-azure-develUpgrade kernel-docsUpgrade kernel-docs-htmlUpgrade kernel-zfcpdumpUpgrade kernel-azure-vdsoUpgrade kernel-kvmsmall-vdsoUpgrade kernel-kvmsmallUpgrade kernel-defaultUpgrade kernel-obs-qaUpgrade kernel-symsUpgrade kernel-default-extraUpgrade kernel-macrosUpgrade kernel-azure-extra | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade linux-image-virtualUpgrade linux-image-lowlatency-64kUpgrade linux-image-genericUpgrade linux-image-oem-24.04bUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.11.0-1018-azureUpgrade linux-image-6.11.0-1015-lowlatencyUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-generic-64kUpgrade linux-image-6.14.0-1007-awsUpgrade linux-image-azure-fdeUpgrade linux-image-6.14.0-1007-raspiUpgrade linux-image-6.11.0-28-genericUpgrade linux-image-6.11.0-1011-realtimeUpgrade linux-image-aws-64kUpgrade linux-image-6.14.0-1004-realtimeUpgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-azure-fde-edgeUpgrade linux-image-6.11.0-1015-awsUpgrade linux-image-oracleUpgrade linux-image-6.14.0-1008-gcpUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-lowlatencyUpgrade linux-image-6.14.0-22-generic-64kUpgrade linux-image-6.14.0-1007-oracle-64kUpgrade linux-image-6.11.0-1017-oracle-64kUpgrade linux-image-6.11.0-1018-azure-fdeUpgrade linux-image-6.14.0-1007-aws-64kUpgrade linux-image-6.11.0-1014-raspiUpgrade linux-image-6.14.0-1008-gcp-64kUpgrade linux-image-azure-fde-6.11Upgrade linux-image-6.14.0-22-genericUpgrade linux-image-lowlatency-64k-6.11Upgrade linux-image-lowlatency-6.11Upgrade linux-image-gcp-64kUpgrade linux-image-6.11.0-1015-lowlatency-64kUpgrade linux-image-raspiUpgrade linux-image-azureUpgrade linux-image-6.11.0-1024-oemUpgrade linux-image-6.14.0-1007-azure-fdeUpgrade linux-image-oracle-64kUpgrade linux-image-realtimeUpgrade linux-image-6.11.0-1016-gcp-64kUpgrade linux-image-6.14.0-1007-oracleUpgrade linux-image-gcpUpgrade linux-image-6.11.0-28-generic-64kUpgrade linux-image-6.14.0-1007-azureUpgrade linux-image-awsUpgrade linux-image-6.11.0-1016-gcpUpgrade linux-image-6.11.0-1017-oracleUpgrade linux-image-generic-hwe-24.04 | Jun 26, 2025 | Apr 16, 2025 |
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