CVE-2026-68192 (GCVE-0-2026-68192)
Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-19 16:31
VLAI
EPSS
VEX
Title
wifi: brcmfmac: make release_scratchbuffers idempotent
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.
Severity
8.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
4684997d9eea29380000e062755aa6d368d789a3 , < 81c58a206d1deee01f4c29236d4154c0872f2a38
(git)
Affected: 4684997d9eea29380000e062755aa6d368d789a3 , < 382ee00b2d1e31869ae576a60d3fbe7a2153512f (git) Affected: 4684997d9eea29380000e062755aa6d368d789a3 , < 739b686aecdb14a6065300ea53401f043e51fd22 (git) Affected: 4684997d9eea29380000e062755aa6d368d789a3 , < b7d1d8cb1bdca56aecebacd2896615da0acc126a (git) Affected: 4684997d9eea29380000e062755aa6d368d789a3 , < 5a045c2f0fbf029873d2295178fa0785ade35af0 (git) Affected: 4684997d9eea29380000e062755aa6d368d789a3 , < 044fca8f45ba9ab6ca526163155234cf88287ff5 (git) Affected: 4684997d9eea29380000e062755aa6d368d789a3 , < 0ca80328df23f851c86866720d4977783c919ee6 (git) Affected: 4684997d9eea29380000e062755aa6d368d789a3 , < 538c51e9d124cf656f2dd0c0394a8545efc7102d (git) |
guessed | |
| Linux | Linux |
Affected:
5.2
Unaffected: 0 , < 5.2 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
{
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"product": "Linux",
"programFiles": [
"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c"
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"version": "5.10.265",
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{
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"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
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{
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"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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"version": "6.18.42",
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},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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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": [
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"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",
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"references": [
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"url": "https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38"
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{
"url": "https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f"
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{
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"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": {
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"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",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-68192",
"date": "2026-10-09",
"epss": "0.00412",
"percentile": "0.33447"
},
"nvd": {
"cve": {
"affected": [
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"product": "Linux",
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"versions": [
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"cveTags": [],
"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."
}
],
"id": "CVE-2026-68192",
"lastModified": "2026-08-19T17:20:35.413",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-10T13:20:06.543",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d"
},
{
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"url": "https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0"
},
{
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"url": "https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-03T00:38:14Z",
"cve": "CVE-2026-68192",
"id": "CVE-2026-68192",
"initial_release_date": "2026-08-12T16:22:56Z",
"product_status:known_affected": "580",
"product_status:known_not_affected": "153",
"product_status:recommended": "252",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68192",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68192.json",
"version": "11"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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