CVE-2026-68192
Description
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.
How to fix
- Linux Linux81c58a206d1deee01f4c29236d4154c0872f2a38, 382ee00b2d1e31869ae576a60d3fbe7a2153512f, 739b686aecdb14a6065300ea53401f043e51fd22, b7d1d8cb1bdca56aecebacd2896615da0acc126a, 5a045c2f0fbf029873d2295178fa0785ade35af0, 044fca8f45ba9ab6ca526163155234cf88287ff5, 0ca80328df23f851c86866720d4977783c919ee6, 538c51e9d124cf656f2dd0c0394a8545efc7102d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < 81c58a206d1deee01f4c29236d4154c0872f2a38, 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < 382ee00b2d1e31869ae576a60d3fbe7a2153512f, 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < 739b686aecdb14a6065300ea53401f043e51fd22, 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < b7d1d8cb1bdca56aecebacd2896615da0acc126a, 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < 5a045c2f0fbf029873d2295178fa0785ade35af0, 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < 044fca8f45ba9ab6ca526163155234cf88287ff5, 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < 0ca80328df23f851c86866720d4977783c919ee6, 4684997d9eea29380000e062755aa6d368d789a3 ≤ v < 538c51e9d124cf656f2dd0c0394a8545efc7102d, 5.2 | 81c58a206d1deee01f4c29236d4154c0872f2a38, 382ee00b2d1e31869ae576a60d3fbe7a2153512f, 739b686aecdb14a6065300ea53401f043e51fd22, b7d1d8cb1bdca56aecebacd2896615da0acc126a, 5a045c2f0fbf029873d2295178fa0785ade35af0, 044fca8f45ba9ab6ca526163155234cf88287ff5, 0ca80328df23f851c86866720d4977783c919ee6, 538c51e9d124cf656f2dd0c0394a8545efc7102d |
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