CVE-2026-74407 (GCVE-0-2026-74407)
Vulnerability from cvelistv5
Published
2026-08-15 05:59
Modified
2026-10-30 12:30
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: ath11k: cancel SSR work items during PCI shutdown A reboot can crash the kernel if it overlaps with WLAN firmware crash recovery (SSR). The crash is a NULL pointer dereference in the MHI teardown path while freeing DMA-backed MHI contexts. Simplified trace: dma_free_attrs mhi_deinit_dev_ctxt [mhi] ath11k_pci_power_down [ath11k_pci] ath11k_pci_shutdown [ath11k_pci] device_shutdown kernel_restart On the host side, SSR is driven by the MHI RDDM callback, which queues reset_work to perform device recovery. reset_work power-cycles the device by calling ath11k_hif_power_down() followed by ath11k_hif_power_up(). The power-down phase deinitializes MHI and frees DMA resources. Shutdown/reboot runs fully asynchronously with this RDDM-driven SSR recovery flow. As a result, the shutdown path (ath11k_pci_shutdown() -> ath11k_pci_power_down()) can race with the SSR recovery sequence. Fix this by canceling SSR-related work items during PCI shutdown, marking the device as unregistering, and serializing the RDDM callback path that checks and queues reset_work. This ensures that no new SSR recovery work can be queued once teardown has started, and that any in-flight recovery work is fully synchronized before device power-down, preventing MHI teardown and DMA resource freeing from running more than once. Note: This issue only affects PCI/MHI-based devices. AHB-based ath11k devices do not queue reset_work in normal SSR flows. Tested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-04866.5-QCAHSPSWPL_V1_V2_SILICONZ_IOE-1
References
Impacted products
Vendor Product Version
Linux Linux Version: 13da397f884d9c9a3fb6616206eeb6c6ab097287
Version: 13da397f884d9c9a3fb6616206eeb6c6ab097287
Version: 13da397f884d9c9a3fb6616206eeb6c6ab097287
Version: 13da397f884d9c9a3fb6616206eeb6c6ab097287
Version: 13da397f884d9c9a3fb6616206eeb6c6ab097287
Version: 13da397f884d9c9a3fb6616206eeb6c6ab097287
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath11k: cancel SSR work items during PCI shutdown\n\nA reboot can crash the kernel if it overlaps with WLAN firmware crash\nrecovery (SSR). The crash is a NULL pointer dereference in the MHI teardown\npath while freeing DMA-backed MHI contexts.\n\nSimplified trace:\n  dma_free_attrs\n  mhi_deinit_dev_ctxt [mhi]\n  ath11k_pci_power_down [ath11k_pci]\n  ath11k_pci_shutdown [ath11k_pci]\n  device_shutdown\n  kernel_restart\n\nOn the host side, SSR is driven by the MHI RDDM callback, which queues\nreset_work to perform device recovery. reset_work power-cycles the device\nby calling ath11k_hif_power_down() followed by ath11k_hif_power_up(). The\npower-down phase deinitializes MHI and frees DMA resources.\n\nShutdown/reboot runs fully asynchronously with this RDDM-driven SSR\nrecovery flow. As a result, the shutdown path\n(ath11k_pci_shutdown() -\u003e ath11k_pci_power_down()) can race with the SSR\nrecovery sequence.\n\nFix this by canceling SSR-related work items during PCI shutdown, marking\nthe device as unregistering, and serializing the RDDM callback path that\nchecks and queues reset_work. This ensures that no new SSR recovery work\ncan be queued once teardown has started, and that any in-flight recovery\nwork is fully synchronized before device power-down, preventing MHI\nteardown and DMA resource freeing from running more than once.\n\nNote: This issue only affects PCI/MHI-based devices. AHB-based ath11k\ndevices do not queue reset_work in normal SSR flows.\n\nTested-on: WCN6855 hw2.1 PCI WLAN.HSP.1.1-04866.5-QCAHSPSWPL_V1_V2_SILICONZ_IOE-1"
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The crash is a NULL pointer dereference in the MHI teardown\\npath while freeing DMA-backed MHI contexts.\\n\\nSimplified trace:\\n  dma_free_attrs\\n  mhi_deinit_dev_ctxt [mhi]\\n  ath11k_pci_power_down [ath11k_pci]\\n  ath11k_pci_shutdown [ath11k_pci]\\n  device_shutdown\\n  kernel_restart\\n\\nOn the host side, SSR is driven by the MHI RDDM callback, which queues\\nreset_work to perform device recovery. reset_work power-cycles the device\\nby calling ath11k_hif_power_down() followed by ath11k_hif_power_up(). The\\npower-down phase deinitializes MHI and frees DMA resources.\\n\\nShutdown/reboot runs fully asynchronously with this RDDM-driven SSR\\nrecovery flow. As a result, the shutdown path\\n(ath11k_pci_shutdown() -\u003e ath11k_pci_power_down()) can race with the SSR\\nrecovery sequence.\\n\\nFix this by canceling SSR-related work items during PCI shutdown, marking\\nthe device as unregistering, and serializing the RDDM callback path that\\nchecks and queues reset_work. 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