CVE-2026-68192wifi: brcmfmac: make release_scratchbuffers idempotent
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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)
- Not given
- 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 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
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
- 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.