wifi: brcmfmac: drain bus_reset work on device removal
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
CVE-2026-64586
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-64586
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"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"
}
]- Related CVEs
- CVE-2026-64586
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #41100 · Revision 1
- Added to Heist Feed
- Publisher date