CVE-2026-68192 (GCVE-0-2026-68192)
Vulnerability from cvelistv5
Published
2026-08-10 12:00
Modified
2026-10-19 20:58
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
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\"https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5\"}, {\"url\": \"https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6\"}, {\"url\": \"https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:31:06.873Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68192\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:58:56.511Z\", \"dateReserved\": \"2026-07-30T09:28:09.373Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T12:00:10.041Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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