CVE-2026-68192 (GCVE-0-2026-68192)
Vulnerability from cvelistv5
Published
2026-08-10 12:00
Modified
2026-08-19 16:31
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
wifi: brcmfmac: make release_scratchbuffers idempotent
brcmf_pcie_release_scratchbuffers() frees the shared.scratch and
shared.ringupd DMA buffers with dma_free_coherent() but does not clear
the pointers afterwards, unlike the sibling release_ringbuffers() which
NULLs commonrings/flowrings/idxbuf on release.
Both the bus_reset .reset callback (brcmf_pcie_reset) and
brcmf_pcie_remove() call release_scratchbuffers. When reset teardown
has run before removal, remove's own teardown would call
dma_free_coherent() a second time on the already-freed DMA allocation.
NULL the pointers after free, matching release_ringbuffers(), so a later
release observes that the allocation has already been released. This
patch makes repeated sequential release safe; the reset-work lifetime is
handled separately by the following patch.
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 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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],
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"vendor": "Linux",
"versions": [
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"version": "5.2"
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"status": "unaffected",
"version": "0",
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},
{
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"status": "unaffected",
"version": "5.10.265",
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},
{
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"status": "unaffected",
"version": "5.15.216",
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.148",
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{
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"status": "unaffected",
"version": "6.12.101",
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},
{
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"status": "unaffected",
"version": "6.18.42",
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},
{
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"version": "7.1.6",
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},
{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: make release_scratchbuffers idempotent\n\nbrcmf_pcie_release_scratchbuffers() frees the shared.scratch and\nshared.ringupd DMA buffers with dma_free_coherent() but does not clear\nthe pointers afterwards, unlike the sibling release_ringbuffers() which\nNULLs commonrings/flowrings/idxbuf on release.\n\nBoth the bus_reset .reset callback (brcmf_pcie_reset) and\nbrcmf_pcie_remove() call release_scratchbuffers. When reset teardown\nhas run before removal, remove\u0027s own teardown would call\ndma_free_coherent() a second time on the already-freed DMA allocation.\n\nNULL the pointers after free, matching release_ringbuffers(), so a later\nrelease observes that the allocation has already been released. This\npatch makes repeated sequential release safe; the reset-work lifetime is\nhandled separately by the following patch.\n\nThis issue was found by an in-house static analysis tool."
}
],
"metrics": [
{
"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 - The flaw is reached during brcmfmac PCIe bus reset/teardown after firmware halt; brcmf_fw_crashed() is invoked from the threaded IRQ handler on BRCMF_D2H_DEV_FWHALT mailbox data from the WiFi firmware, which an adjacent attacker can trigger with crafted over-the-air WiFi traffic to crash the dongle.\nAC:L - An attacker who induces firmware halt controls the reset sequence; brcmf_pcie_reset() always frees scratch buffers first and a later brcmf_pcie_remove() or failed brcmf_pcie_setup() teardown calls release_scratchbuffers() again on the same stale pointers, making the double-free deterministic without races they cannot influence.\nPR:N - No host privileges are required because crashing Broadcom FullMAC firmware via adjacent WiFi frames reaches brcmf_fw_crashed() without authentication, CAP_NET_ADMIN, or local access; the debugfs reset path is root-only but is not needed for the highest-impact attack scenario.\nUI:N - Exploitation only requires a victim with an active brcmfmac PCIe WiFi interface within RF range; no victim click, file open, driver unload, or other explicit user action is needed beyond normal always-on WiFi operation on laptops and embedded hosts using Broadcom PCIe FullMAC chips.\nS:U - The vulnerability corrupts kernel DMA/page-allocator state and enables host kernel privilege escalation within the same security authority; it does not cross VM, container, or IOMMU boundaries, so scope remains unchanged.\nC:H - Calling dma_free_coherent() twice on the same scratch and ringupd DMA allocations is a double-free of kernel coherent memory; this allocator-metadata corruption can be leveraged for arbitrary kernel memory disclosure even when full exploitation is not attempted, per kernel CVSS guidance for memory corruption.\nI:H - Double-free of dma_alloc_coherent buffers corrupts the kernel DMA/page heap freelist, enabling attacker-controlled reallocation and arbitrary kernel writes or control-flow hijack on systems with BRCMFMAC_PCIE enabled and a reachable Broadcom PCIe FullMAC wireless device.\nA:H - Re-freeing already released DMA-coherent allocations during driver reset or removal typically causes immediate kernel BUG/oops/panic or fatal allocator corruption during teardown, guaranteeing severe host availability loss on affected Broadcom PCIe WiFi systems even when code execution is not achieved."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:31:06.873Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38"
},
{
"url": "https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f"
},
{
"url": "https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22"
},
{
"url": "https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a"
},
{
"url": "https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0"
},
{
"url": "https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5"
},
{
"url": "https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6"
},
{
"url": "https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d"
}
],
"title": "wifi: brcmfmac: make release_scratchbuffers idempotent",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68192",
"datePublished": "2026-08-10T12:00:10.041Z",
"dateReserved": "2026-07-30T09:28:09.373Z",
"dateUpdated": "2026-08-19T16:31:06.873Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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