{"id":"CVE-2026-64586","revision":"114a16b264a44802ad498a6d48cedcb9","records":[{"revision":"114a16b264a44802ad498a6d48cedcb9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64586","aliases":[],"title":"wifi: brcmfmac: drain bus_reset work on device removal","description":"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->bus_reset, whose callback recovers drvr through container_of()\nand dereferences it.  The removal path frees drvr (brcmf_free ->\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 -> brcmf_detach; SDIO brcmf_sdio_bus_reset ->\nbrcmf_sdiod_remove -> 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.","state":0,"publishedAt":"2026-08-06T07:06:27.158+00:00","modifiedAt":"2026-10-19T20:48:43.327+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"9dfb09cb0abbf92a06f93e0715e163aa188a84da\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"4824e3bcc68f8d678b409039d1bb48c7b5ea73dc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"61127dd20920bf28460a1609aabb0dafa2f54fac\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"c268331845ee00dbdbccb000826bb612dff2bee7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"e3815d1ffbb9be4f1605ddc3b427557893461683\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"02d378828af8bb74f6c2f4d2bee3c77cf16c861e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"177a25be1195f8bdc6160ba5f1a5699f7041c985\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4684997d9eea29380000e062755aa6d368d789a3\",\n                            \"lessThan\": \"43b25879f004c98defa2776bedc6ca4763c51945\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h\",\n                        \"drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.2\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.266\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.217\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.184\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.151\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.103\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.44\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.6\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9dfb09cb0abbf92a06f93e0715e163aa188a84da","https://git.kernel.org/stable/c/4824e3bcc68f8d678b409039d1bb48c7b5ea73dc","https://git.kernel.org/stable/c/61127dd20920bf28460a1609aabb0dafa2f54fac","https://git.kernel.org/stable/c/c268331845ee00dbdbccb000826bb612dff2bee7","https://git.kernel.org/stable/c/e3815d1ffbb9be4f1605ddc3b427557893461683","https://git.kernel.org/stable/c/02d378828af8bb74f6c2f4d2bee3c77cf16c861e","https://git.kernel.org/stable/c/177a25be1195f8bdc6160ba5f1a5699f7041c985","https://git.kernel.org/stable/c/43b25879f004c98defa2776bedc6ca4763c51945"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64586","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64586","identifiers":["CVE-2026-64586"]},"retained":false,"historicalAffected":[]}],"coverage":[]}