High 8.8Published Aug 10, 2026

CVE-2026-68192wifi: brcmfmac: make release_scratchbuffers idempotent

Updated under an hour ago (Oct 26, 2026, 3:23 PM ET)

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Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-415
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	4684997d9eea29380000e062755aa6d368d789a3 builds before 81c58a206d1deee01f4c29236d4154c0872f2a38; 4684997d9eea29380000e062755aa6d368d789a3 builds before 382ee00b2d1e31869ae576a60d3fbe7a2153512f; 4684997d9eea29380000e062755aa6d368d789a3 builds before 739b686aecdb14a6065300ea53401f043e51fd22; from 4684997d9eea29380000e062755aa6d368d789a3 before b7d1d8cb1bdca56aecebacd2896615da0acc126a; 4684997d9eea29380000e062755aa6d368d789a3 builds before 5a045c2f0fbf029873d2295178fa0785ade35af0; 4684997d9eea29380000e062755aa6d368d789a3 builds before 044fca8f45ba9ab6ca526163155234cf88287ff5; 4684997d9eea29380000e062755aa6d368d789a3 builds before 0ca80328df23f851c86866720d4977783c919ee6; 4684997d9eea29380000e062755aa6d368d789a3 builds before 538c51e9d124cf656f2dd0c0394a8545efc7102d	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.