CVE-2026-68192

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5
https://git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6
https://git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f
https://git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d
https://git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0
https://git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22
https://git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38
https://git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-10 13:20

Updated : 2026-08-19 17:20

NVD link : CVE-2026-68192

Mitre link : CVE-2026-68192

CVE.ORG link : CVE-2026-68192

JSON object : View

Products Affected

No product.

CWE

No CWE.

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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."}], "lastModified": "2026-08-19T17:20:35.413", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}