CVE-2026-68192High· 8.8▾ TwilightIn 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_cohere…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.4%
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.
Linux >= 4684997d9eea29380000e062755aa6d368d789a3 < 81c58a206d1deee01f4c29236d4154c0872f2a38Linux >= 4684997d9eea29380000e062755aa6d368d789a3 < 382ee00b2d1e31869ae576a60d3fbe7a2153512fLinux >= 4684997d9eea29380000e062755aa6d368d789a3 < 739b686aecdb14a6065300ea53401f043e51fd22Linux >= 4684997d9eea29380000e062755aa6d368d789a3 < b7d1d8cb1bdca56aecebacd2896615da0acc126aLinux >= 4684997d9eea29380000e062755aa6d368d789a3 < 5a045c2f0fbf029873d2295178fa0785ade35af0Linux >= 4684997d9eea29380000e062755aa6d368d789a3 < 044fca8f45ba9ab6ca526163155234cf88287ff5Linux >= 4684997d9eea29380000e062755aa6d368d789a3 < 0ca80328df23f851c86866720d4977783c919ee6Linux >= 4684997d9eea29380000e062755aa6d368d789a3 < 538c51e9d124cf656f2dd0c0394a8545efc7102dLinux 5.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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