CVE-2026-68192 (GCVE-0-2026-68192)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-19 16:31
VLAI
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)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted 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)
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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)
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          "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."
        }
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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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              "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."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f"
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        {
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      "title": "wifi: brcmfmac: make release_scratchbuffers idempotent",
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    "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"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"81c58a206d1deee01f4c29236d4154c0872f2a38\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"382ee00b2d1e31869ae576a60d3fbe7a2153512f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"739b686aecdb14a6065300ea53401f043e51fd22\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"b7d1d8cb1bdca56aecebacd2896615da0acc126a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"5a045c2f0fbf029873d2295178fa0785ade35af0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"044fca8f45ba9ab6ca526163155234cf88287ff5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"0ca80328df23f851c86866720d4977783c919ee6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4684997d9eea29380000e062755aa6d368d789a3\",\"lessThan\":\"538c51e9d124cf656f2dd0c0394a8545efc7102d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-13T01:28:21Z",
      "cve": "CVE-2026-68192",
      "id": "CVE-2026-68192",
      "initial_release_date": "2026-08-12T16:22:56Z",
      "product_status:known_affected": "144",
      "product_status:known_not_affected": "152",
      "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": "3"
    }
  }
}



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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.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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