{"id":"CVE-2026-74407","state":"PUBLISHED","title":"wifi: ath11k: cancel SSR work items during PCI shutdown","description":"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() -> 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","publishedAt":"2026-08-15T05:59:16.044Z","updatedAt":"2026-10-30T12:30:00.729Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"7630eb217166435e8a6dd501fa4ad304e2264407","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"f82d42577ee4a191b0ad0f0a3b49fc1935dff845","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"daeb44fb8d700654f37f54d1ee36cd67645d0d34","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"6dd3701facc0cee62d6682e49eed64499f9d0e43","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"53dd29e8aeb2a1b5f079178551836b85fc6b53df","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"8c79aac429b583301f387374ff37c59be671df87","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath11k/mhi.c","drivers/net/wireless/ath/ath11k/pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath11k/mhi.c","drivers/net/wireless/ath/ath11k/pci.c"]}],"references":["https://git.kernel.org/stable/c/7630eb217166435e8a6dd501fa4ad304e2264407","https://git.kernel.org/stable/c/f82d42577ee4a191b0ad0f0a3b49fc1935dff845","https://git.kernel.org/stable/c/daeb44fb8d700654f37f54d1ee36cd67645d0d34","https://git.kernel.org/stable/c/6dd3701facc0cee62d6682e49eed64499f9d0e43","https://git.kernel.org/stable/c/53dd29e8aeb2a1b5f079178551836b85fc6b53df","https://git.kernel.org/stable/c/8c79aac429b583301f387374ff37c59be671df87"],"weaknesses":[],"ingestedAt":"2026-10-30T12:48:04.825Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74407.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74407","state":"PUBLISHED","datePublished":"2026-08-15T05:59:16.044Z","dateUpdated":"2026-10-30T12:30:00.729Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.892Z"},"containers":{"cna":{"title":"wifi: ath11k: cancel SSR work items during PCI shutdown","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() -> 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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"7630eb217166435e8a6dd501fa4ad304e2264407","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"f82d42577ee4a191b0ad0f0a3b49fc1935dff845","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"daeb44fb8d700654f37f54d1ee36cd67645d0d34","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"6dd3701facc0cee62d6682e49eed64499f9d0e43","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"53dd29e8aeb2a1b5f079178551836b85fc6b53df","versionType":"git"},{"version":"13da397f884d9c9a3fb6616206eeb6c6ab097287","status":"affected","lessThan":"8c79aac429b583301f387374ff37c59be671df87","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath11k/mhi.c","drivers/net/wireless/ath/ath11k/pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/ath/ath11k/mhi.c","drivers/net/wireless/ath/ath11k/pci.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7630eb217166435e8a6dd501fa4ad304e2264407"},{"url":"https://git.kernel.org/stable/c/f82d42577ee4a191b0ad0f0a3b49fc1935dff845"},{"url":"https://git.kernel.org/stable/c/daeb44fb8d700654f37f54d1ee36cd67645d0d34"},{"url":"https://git.kernel.org/stable/c/6dd3701facc0cee62d6682e49eed64499f9d0e43"},{"url":"https://git.kernel.org/stable/c/53dd29e8aeb2a1b5f079178551836b85fc6b53df"},{"url":"https://git.kernel.org/stable/c/8c79aac429b583301f387374ff37c59be671df87"}],"metrics":[{"cvssV3_1":{"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"},"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—firmware 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":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:30:00.729Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-74407","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:55:54.888138Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:05:43.486Z"}}]}}}