CVE-2026-64586 (GCVE-0-2026-64586)
Vulnerability from cvelistv5
Published
2026-08-06 07:06
Modified
2026-10-19 20:48
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: brcmfmac: drain bus_reset work on device removal brcmf_fw_crashed() and the debugfs "reset" entry both schedule drvr->bus_reset, whose callback recovers drvr through container_of() and dereferences it. The removal path frees drvr (brcmf_free -> wiphy_free) without draining the work, so a bus_reset callback pending or running during removal can outlive drvr. Cancellation cannot live in brcmf_detach() or brcmf_free(): the work callback reaches teardown through the bus .reset op (PCIe brcmf_pcie_reset -> brcmf_detach; SDIO brcmf_sdio_bus_reset -> brcmf_sdiod_remove -> brcmf_free), so cancelling there would wait for the running work and deadlock. Add a per-bus mutex (bus_reset_lock) and route all arming through brcmf_bus_schedule_reset(), which under the lock skips when the bus is marked removing. Each bus remove entry calls brcmf_bus_cancel_reset_work(), which under the same lock sets removing and cancels the work. Holding the mutex across cancel_work_sync() makes the set-removing + drain step atomic. Every producer reaches the arming path from process context -- the PCIe firmware-halt notification runs in the threaded IRQ handler (brcmf_pcie_isr_thread) and the SDIO hostmail path runs from the data workqueue -- so the mutex is taken only in sleepable contexts. Where applicable the remove entry first stops the firmware-crash producer: on PCIe mask the mailbox and synchronize_irq; on SDIO unregister the bus interrupt and cancel the data worker, which also reports firmware halts through brcmf_fw_crashed(). The mutex is initialized at bus allocation. The SDIO suspend power-off path frees drvr through the same brcmf_sdiod_remove() and takes the same lock; resume re-allows the work only on a successful re-probe. Also guard brcmf_fw_crashed() against a NULL bus_if/drvr: it can fire before brcmf_attach() wires up drvr, and it dereferences drvr (bphy_err/brcmf_dev_coredump) before reaching the arming gate. The bus_reset work is shared across buses, so the drain is applied to every remove path: PCIe (the .reset op introduced by the Fixes commit), SDIO (arms the same work through brcmf_fw_crashed()), and USB (via the debugfs "reset" entry). cancel_work_sync() drains a running or pending bus_reset work item before removal frees drvr, and patch 1/2 makes the scratch-buffer release safe when reset teardown has already released those DMA buffers. This patch fixes the lifetime of the bus_reset work item itself. It does not attempt to address the separate, pre-existing lifetime of the asynchronous firmware completion started by the PCIe reset path. That callback needs its own lifetime/ownership protocol and is being tracked separately. This issue was found by an in-house static analysis tool.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4684997d9eea29380000e062755aa6d368d789a3
Version: 4684997d9eea29380000e062755aa6d368d789a3
Version: 4684997d9eea29380000e062755aa6d368d789a3
Version: 4684997d9eea29380000e062755aa6d368d789a3
Version: 4684997d9eea29380000e062755aa6d368d789a3
Version: 4684997d9eea29380000e062755aa6d368d789a3
Version: 4684997d9eea29380000e062755aa6d368d789a3
Version: 4684997d9eea29380000e062755aa6d368d789a3
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            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c",
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c",
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h",
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            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h",
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c",
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c",
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c",
            "drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: drain bus_reset work on device removal\n\nbrcmf_fw_crashed() and the debugfs \"reset\" entry both schedule\ndrvr-\u003ebus_reset, whose callback recovers drvr through container_of()\nand dereferences it.  The removal path frees drvr (brcmf_free -\u003e\nwiphy_free) without draining the work, so a bus_reset callback pending\nor running during removal can outlive drvr.\n\nCancellation cannot live in brcmf_detach() or brcmf_free(): the work\ncallback reaches teardown through the bus .reset op (PCIe\nbrcmf_pcie_reset -\u003e brcmf_detach; SDIO brcmf_sdio_bus_reset -\u003e\nbrcmf_sdiod_remove -\u003e brcmf_free), so cancelling there would wait for\nthe running work and deadlock.\n\nAdd a per-bus mutex (bus_reset_lock) and route all arming through\nbrcmf_bus_schedule_reset(), which under the lock skips when the bus is\nmarked removing.  Each bus remove entry calls\nbrcmf_bus_cancel_reset_work(), which under the same lock sets removing\nand cancels the work.  Holding the mutex across cancel_work_sync() makes\nthe set-removing + drain step atomic.  Every producer reaches the arming\npath from process context -- the PCIe firmware-halt notification runs in\nthe threaded IRQ handler (brcmf_pcie_isr_thread) and the SDIO hostmail\npath runs from the data workqueue -- so the mutex is taken only in\nsleepable contexts.  Where applicable the remove entry first stops the\nfirmware-crash producer: on PCIe mask the mailbox and synchronize_irq;\non SDIO unregister the bus interrupt and cancel the data worker, which\nalso reports firmware halts through brcmf_fw_crashed().  The mutex is\ninitialized at bus allocation.  The SDIO suspend power-off path frees\ndrvr through the same brcmf_sdiod_remove() and takes the same lock;\nresume re-allows the work only on a successful re-probe.\n\nAlso guard brcmf_fw_crashed() against a NULL bus_if/drvr: it can fire\nbefore brcmf_attach() wires up drvr, and it dereferences drvr\n(bphy_err/brcmf_dev_coredump) before reaching the arming gate.\n\nThe bus_reset work is shared across buses, so the drain is applied to\nevery remove path: PCIe (the .reset op introduced by the Fixes commit),\nSDIO (arms the same work through brcmf_fw_crashed()), and USB (via the\ndebugfs \"reset\" entry).  cancel_work_sync() drains a running or pending\nbus_reset work item before removal frees drvr, and patch 1/2 makes the\nscratch-buffer release safe when reset teardown has already released\nthose DMA buffers.\n\nThis patch fixes the lifetime of the bus_reset work item itself.  It does\nnot attempt to address the separate, pre-existing lifetime of the\nasynchronous firmware completion started by the PCIe reset path.  That\ncallback needs its own lifetime/ownership protocol and is being tracked\nseparately.\n\nThis issue was found by an in-house static analysis tool."
        }
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            "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"
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              "value": "AV:A - bus_reset is armed by brcmf_fw_crashed() when Broadcom fullmac signals FWHALT (PCIe mailbox ISR thread / SDIO hostmail). An adjacent 802.11 attacker can induce that halt with malformed frames; the pending work then races device removal (USB hot-unplug, SDIO suspend power-off) that frees drvr without draining the work.\nAC:L - The attacker repeatedly induces firmware halts to schedule bus_reset and can align removal (USB unplug on shared dongles/kiosks, or SDIO suspend) so the work runs after wiphy_free; both sides are attacker-influenced and freely retryable, so success does not depend on uncontrollable timing.\nPR:N - FWHALT delivery and brcmf_fw_crashed() need no host credentials; concurrent free via USB disconnect or automatic SDIO power-cut suspend likewise requires no account or capability. The debugfs reset path is root-only but is not the highest-severity reachability.\nUI:N - Firmware-halt recovery and device removal/suspend paths run in kernel workqueues and bus callbacks without the victim opening a file, mounting media, or otherwise interacting.\nS:U - The UAF corrupts host-kernel heap (struct brcmf_pub embedded in the wiphy) within the same kernel security authority; it is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Use-after-free of drvr via container_of on the freed bus_reset work_struct lets an attacker reallocate the wiphy/drvr slab and observe attacker-controlled object contents through subsequent driver dereferences, yielding an arbitrary kernel read primitive.\nI:H - The recycled work_struct/drvr is dispatched by the workqueue (func pointer / bus_if ops), enabling heap corruption and control-flow hijack when brcmf_core_bus_reset runs on attacker-shaped memory after brcmf_free/wiphy_free.\nA:H - Even without full exploitation, running bus_reset after wiphy_free dereferences freed drvr/bus_if state and reliably causes kernel oops/panic or driver teardown failure, denying availability of the host."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:45:44.685Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9dfb09cb0abbf92a06f93e0715e163aa188a84da"
        },
        {
          "url": "https://git.kernel.org/stable/c/4824e3bcc68f8d678b409039d1bb48c7b5ea73dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/61127dd20920bf28460a1609aabb0dafa2f54fac"
        },
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          "url": "https://git.kernel.org/stable/c/c268331845ee00dbdbccb000826bb612dff2bee7"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/43b25879f004c98defa2776bedc6ca4763c51945"
        }
      ],
      "title": "wifi: brcmfmac: drain bus_reset work on device removal",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64586",
    "datePublished": "2026-08-06T07:06:27.158Z",
    "dateReserved": "2026-07-19T15:36:31.798Z",
    "dateUpdated": "2026-10-19T20:48:43.327Z",
    "state": "PUBLISHED"
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An adjacent 802.11 attacker can induce that halt with malformed frames; the pending work then races device removal (USB hot-unplug, SDIO suspend power-off) that frees drvr without draining the work.\\nAC:L - The attacker repeatedly induces firmware halts to schedule bus_reset and can align removal (USB unplug on shared dongles/kiosks, or SDIO suspend) so the work runs after wiphy_free; both sides are attacker-influenced and freely retryable, so success does not depend on uncontrollable timing.\\nPR:N - FWHALT delivery and brcmf_fw_crashed() need no host credentials; concurrent free via USB disconnect or automatic SDIO power-cut suspend likewise requires no account or capability. The debugfs reset path is root-only but is not the highest-severity reachability.\\nUI:N - Firmware-halt recovery and device removal/suspend paths run in kernel workqueues and bus callbacks without the victim opening a file, mounting media, or otherwise interacting.\\nS:U - The UAF corrupts host-kernel heap (struct brcmf_pub embedded in the wiphy) within the same kernel security authority; it is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\\nC:H - Use-after-free of drvr via container_of on the freed bus_reset work_struct lets an attacker reallocate the wiphy/drvr slab and observe attacker-controlled object contents through subsequent driver dereferences, yielding an arbitrary kernel read primitive.\\nI:H - The recycled work_struct/drvr is dispatched by the workqueue (func pointer / bus_if ops), enabling heap corruption and control-flow hijack when brcmf_core_bus_reset runs on attacker-shaped memory after brcmf_free/wiphy_free.\\nA:H - Even without full exploitation, running bus_reset after wiphy_free dereferences freed drvr/bus_if state and reliably causes kernel oops/panic or driver teardown failure, denying availability of the host.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"9dfb09cb0abbf92a06f93e0715e163aa188a84da\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"4824e3bcc68f8d678b409039d1bb48c7b5ea73dc\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"61127dd20920bf28460a1609aabb0dafa2f54fac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"c268331845ee00dbdbccb000826bb612dff2bee7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"e3815d1ffbb9be4f1605ddc3b427557893461683\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"02d378828af8bb74f6c2f4d2bee3c77cf16c861e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"177a25be1195f8bdc6160ba5f1a5699f7041c985\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\", \"lessThan\": \"43b25879f004c98defa2776bedc6ca4763c51945\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.266\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.217\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.184\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.151\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.103\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.44\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h\", \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9dfb09cb0abbf92a06f93e0715e163aa188a84da\"}, {\"url\": \"https://git.kernel.org/stable/c/4824e3bcc68f8d678b409039d1bb48c7b5ea73dc\"}, {\"url\": \"https://git.kernel.org/stable/c/61127dd20920bf28460a1609aabb0dafa2f54fac\"}, {\"url\": \"https://git.kernel.org/stable/c/c268331845ee00dbdbccb000826bb612dff2bee7\"}, {\"url\": \"https://git.kernel.org/stable/c/e3815d1ffbb9be4f1605ddc3b427557893461683\"}, {\"url\": \"https://git.kernel.org/stable/c/02d378828af8bb74f6c2f4d2bee3c77cf16c861e\"}, {\"url\": \"https://git.kernel.org/stable/c/177a25be1195f8bdc6160ba5f1a5699f7041c985\"}, {\"url\": \"https://git.kernel.org/stable/c/43b25879f004c98defa2776bedc6ca4763c51945\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: brcmfmac: drain bus_reset work on device removal\\n\\nbrcmf_fw_crashed() and the debugfs \\\"reset\\\" entry both schedule\\ndrvr-\u003ebus_reset, whose callback recovers drvr through container_of()\\nand dereferences it.  The removal path frees drvr (brcmf_free -\u003e\\nwiphy_free) without draining the work, so a bus_reset callback pending\\nor running during removal can outlive drvr.\\n\\nCancellation cannot live in brcmf_detach() or brcmf_free(): the work\\ncallback reaches teardown through the bus .reset op (PCIe\\nbrcmf_pcie_reset -\u003e brcmf_detach; SDIO brcmf_sdio_bus_reset -\u003e\\nbrcmf_sdiod_remove -\u003e brcmf_free), so cancelling there would wait for\\nthe running work and deadlock.\\n\\nAdd a per-bus mutex (bus_reset_lock) and route all arming through\\nbrcmf_bus_schedule_reset(), which under the lock skips when the bus is\\nmarked removing.  Each bus remove entry calls\\nbrcmf_bus_cancel_reset_work(), which under the same lock sets removing\\nand cancels the work.  Holding the mutex across cancel_work_sync() makes\\nthe set-removing + drain step atomic.  Every producer reaches the arming\\npath from process context -- the PCIe firmware-halt notification runs in\\nthe threaded IRQ handler (brcmf_pcie_isr_thread) and the SDIO hostmail\\npath runs from the data workqueue -- so the mutex is taken only in\\nsleepable contexts.  Where applicable the remove entry first stops the\\nfirmware-crash producer: on PCIe mask the mailbox and synchronize_irq;\\non SDIO unregister the bus interrupt and cancel the data worker, which\\nalso reports firmware halts through brcmf_fw_crashed().  The mutex is\\ninitialized at bus allocation.  The SDIO suspend power-off path frees\\ndrvr through the same brcmf_sdiod_remove() and takes the same lock;\\nresume re-allows the work only on a successful re-probe.\\n\\nAlso guard brcmf_fw_crashed() against a NULL bus_if/drvr: it can fire\\nbefore brcmf_attach() wires up drvr, and it dereferences drvr\\n(bphy_err/brcmf_dev_coredump) before reaching the arming gate.\\n\\nThe bus_reset work is shared across buses, so the drain is applied to\\nevery remove path: PCIe (the .reset op introduced by the Fixes commit),\\nSDIO (arms the same work through brcmf_fw_crashed()), and USB (via the\\ndebugfs \\\"reset\\\" entry).  cancel_work_sync() drains a running or pending\\nbus_reset work item before removal frees drvr, and patch 1/2 makes the\\nscratch-buffer release safe when reset teardown has already released\\nthose DMA buffers.\\n\\nThis patch fixes the lifetime of the bus_reset work item itself.  It does\\nnot attempt to address the separate, pre-existing lifetime of the\\nasynchronous firmware completion started by the PCIe reset path.  That\\ncallback needs its own lifetime/ownership protocol and is being tracked\\nseparately.\\n\\nThis issue was found by an in-house static analysis tool.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.266\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.184\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.151\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.103\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.44\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-23T12:45:44.685Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64586\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:48:43.327Z\", \"dateReserved\": \"2026-07-19T15:36:31.798Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-06T07:06:27.158Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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