{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68192", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.373Z", "datePublished": "2026-08-10T12:00:10.041Z", "dateUpdated": "2026-08-19T16:31:06.873Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:31:06.873Z" }, "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's 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": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c" ], "versions": [ { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "81c58a206d1deee01f4c29236d4154c0872f2a38", "status": "affected", "versionType": "git" }, { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "382ee00b2d1e31869ae576a60d3fbe7a2153512f", "status": "affected", "versionType": "git" }, { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "739b686aecdb14a6065300ea53401f043e51fd22", "status": "affected", "versionType": "git" }, { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "b7d1d8cb1bdca56aecebacd2896615da0acc126a", "status": "affected", "versionType": "git" }, { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "5a045c2f0fbf029873d2295178fa0785ade35af0", "status": "affected", "versionType": "git" }, { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "044fca8f45ba9ab6ca526163155234cf88287ff5", "status": "affected", "versionType": "git" }, { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "0ca80328df23f851c86866720d4977783c919ee6", "status": "affected", "versionType": "git" }, { "version": "4684997d9eea29380000e062755aa6d368d789a3", "lessThan": "538c51e9d124cf656f2dd0c0394a8545efc7102d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c" ], "versions": [ { "version": "5.2", "status": "affected" }, { "version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }