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CVE-2026-74407 (GCVE-0-2026-74407)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
Title
wifi: ath11k: cancel SSR work items during PCI shutdown
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
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 13da397f884d9c9a3fb6616206eeb6c6ab097287 , < 53dd29e8aeb2a1b5f079178551836b85fc6b53df (git)
Affected: 13da397f884d9c9a3fb6616206eeb6c6ab097287 , < 8c79aac429b583301f387374ff37c59be671df87 (git)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath11k/mhi.c",
            "drivers/net/wireless/ath/ath11k/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "53dd29e8aeb2a1b5f079178551836b85fc6b53df",
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              "version": "13da397f884d9c9a3fb6616206eeb6c6ab097287",
              "versionType": "git"
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              "status": "affected",
              "version": "13da397f884d9c9a3fb6616206eeb6c6ab097287",
              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/ath/ath11k/mhi.c",
            "drivers/net/wireless/ath/ath11k/pci.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "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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      "metrics": [
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          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - WiFi ath11k PCI/MHI devices (QCA6390/WCN6855 laptops, workstations, gateways) enter SSR when WLAN firmware faults; MHI RDDM interrupts queue reset_work recovery that races kernel_restart PCI shutdown (ath11k_pci_shutdown) on the same driver.\nAC:L - An adjacent attacker controls SSR timing by repeatedly inducing firmware crashes via crafted/malicious 802.11 traffic, keeping reset_work active until shutdown overlaps; this is an attacker-driven race, not luck-dependent memory layout or rare kernel config.\nPR:N - No Linux account or kernel capability is needed to trigger the SSR leg\u2014firmware crash/RDDM recovery is driven by over-the-air WLAN events; concurrent device_shutdown during automated maintenance or fleet reboots can overlap without attacker CAP_SYS_BOOT.\nUI:N - Only an active ath11k WLAN interface is required (default on WiFi-equipped systems); no victim clicks, network joins, or manual reboot actions are needed because unattended updates and scheduled maintenance reboots can overlap SSR automatically.\nS:U - Impact is kernel panic/oops from unsynchronized MHI DMA teardown within the host kernel security boundary; this does not cross VM, container, or IOMMU trust domains.\nC:H - Concurrent mhi_unprepare_after_power_down/mhi_deinit_dev_ctxt from reset_work and ath11k_pci_shutdown can double-free coherent DMA rings/contexts or dereference freed MHI state, enabling arbitrary kernel memory reads and information disclosure.\nI:H - Racing power-down paths free the same MHI DMA-backed ring/context memory twice, corrupting kernel DMA allocator metadata and enabling controlled reallocation for arbitrary kernel writes, control-flow hijack, and privilege escalation.\nA:H - NULL pointer dereference and/or double dma_free in mhi_deinit_dev_ctxt during PCI shutdown overlapping SSR reliably causes kernel oops/panic, denying availability and potentially aborting reboot on affected Qualcomm ath11k PCI systems."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:46:50.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/53dd29e8aeb2a1b5f079178551836b85fc6b53df"
        },
        {
          "url": "https://git.kernel.org/stable/c/8c79aac429b583301f387374ff37c59be671df87"
        }
      ],
      "title": "wifi: ath11k: cancel SSR work items during PCI shutdown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74407",
    "datePublished": "2026-08-15T05:59:16.044Z",
    "dateReserved": "2026-08-15T05:44:03.892Z",
    "dateUpdated": "2026-08-17T05:46:50.498Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74407",
      "date": "2026-09-05",
      "epss": "0.00218",
      "percentile": "0.12211"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T14:59:43.000Z",
      "cve": "CVE-2026-74407",
      "id": "msrc_CVE-2026-74407",
      "initial_release_date": "2026-08-23T14:59:43.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "wifi: ath11k: cancel SSR work items during PCI shutdown",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74407.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74407\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T06:22:42.737\",\"lastModified\":\"2026-08-17T06:19:35.977\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/wireless/ath/ath11k/mhi.c\",\"drivers/net/wireless/ath/ath11k/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"13da397f884d9c9a3fb6616206eeb6c6ab097287\",\"lessThan\":\"53dd29e8aeb2a1b5f079178551836b85fc6b53df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"13da397f884d9c9a3fb6616206eeb6c6ab097287\",\"lessThan\":\"8c79aac429b583301f387374ff37c59be671df87\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/wireless/ath/ath11k/mhi.c\",\"drivers/net/wireless/ath/ath11k/pci.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/53dd29e8aeb2a1b5f079178551836b85fc6b53df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8c79aac429b583301f387374ff37c59be671df87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T22:18:14+00:00",
      "cve": "CVE-2026-74407",
      "id": "CVE-2026-74407",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: ath11k: cancel SSR work items during PCI shutdown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74407.json",
      "version": "3"
    }
  }
}



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