CVE-2026-68192

wifi: brcmfmac: make release_scratchbuffers idempotent

State: Published
Severity: 8.8 High
Published: Aug 10, 2026
Updated: Oct 19, 2026
Reserved: Jul 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-415 Double Free

Affected Products

Product	Versions
LinuxLinux	4684997d9eea29380000e062755aa6d368d789a3 to before 81c58a206d1deee01f4c29236d4154c0872f2a38Affected 4684997d9eea29380000e062755aa6d368d789a3 to before 382ee00b2d1e31869ae576a60d3fbe7a2153512fAffected 4684997d9eea29380000e062755aa6d368d789a3 to before 739b686aecdb14a6065300ea53401f043e51fd22Affected 4684997d9eea29380000e062755aa6d368d789a3 to before b7d1d8cb1bdca56aecebacd2896615da0acc126aAffected 4684997d9eea29380000e062755aa6d368d789a3 to before 5a045c2f0fbf029873d2295178fa0785ade35af0Affected 4684997d9eea29380000e062755aa6d368d789a3 to before 044fca8f45ba9ab6ca526163155234cf88287ff5Affected 4684997d9eea29380000e062755aa6d368d789a3 to before 0ca80328df23f851c86866720d4977783c919ee6Affected 4684997d9eea29380000e062755aa6d368d789a3 to before 538c51e9d124cf656f2dd0c0394a8545efc7102dAffected
LinuxLinux	5.2Affected before 5.2Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.148 through 6.6.Not affected 6.12.101 through 6.12.Not affected 6.18.42 through 6.18.Not affected 7.1.6 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

4684997d9eea29380000e062755aa6d368d789a3 to before 81c58a206d1deee01f4c29236d4154c0872f2a38Affected
4684997d9eea29380000e062755aa6d368d789a3 to before 382ee00b2d1e31869ae576a60d3fbe7a2153512fAffected
4684997d9eea29380000e062755aa6d368d789a3 to before 739b686aecdb14a6065300ea53401f043e51fd22Affected
4684997d9eea29380000e062755aa6d368d789a3 to before b7d1d8cb1bdca56aecebacd2896615da0acc126aAffected
4684997d9eea29380000e062755aa6d368d789a3 to before 5a045c2f0fbf029873d2295178fa0785ade35af0Affected
4684997d9eea29380000e062755aa6d368d789a3 to before 044fca8f45ba9ab6ca526163155234cf88287ff5Affected
4684997d9eea29380000e062755aa6d368d789a3 to before 0ca80328df23f851c86866720d4977783c919ee6Affected
4684997d9eea29380000e062755aa6d368d789a3 to before 538c51e9d124cf656f2dd0c0394a8545efc7102dAffected

LinuxLinux

5.2Affected
before 5.2Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.148 through 6.6.*Not affected
6.12.101 through 6.12.*Not affected
6.18.42 through 6.18.*Not affected
7.1.6 through 7.1.*Not affected
7.2 and laterNot affected

References

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