wifi: brcmfmac: make release_scratchbuffers idempotent

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68192
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:06 UTC
Updated2026-08-19 17:20:35 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.003980000 probability, percentile 0.332110000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 81c58a206d1deee01f4c29236d4154c0872f2a38 git Not specified
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 382ee00b2d1e31869ae576a60d3fbe7a2153512f git Not specified
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 739b686aecdb14a6065300ea53401f043e51fd22 git Not specified
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 b7d1d8cb1bdca56aecebacd2896615da0acc126a git Not specified
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 5a045c2f0fbf029873d2295178fa0785ade35af0 git Not specified
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 044fca8f45ba9ab6ca526163155234cf88287ff5 git Not specified
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 0ca80328df23f851c86866720d4977783c919ee6 git Not specified
CNA Linux Linux affected 4684997d9eea29380000e062755aa6d368d789a3 538c51e9d124cf656f2dd0c0394a8545efc7102d git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/739b686aecdb14a6065300ea53401f043e51fd22 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/382ee00b2d1e31869ae576a60d3fbe7a2153512f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0ca80328df23f851c86866720d4977783c919ee6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/044fca8f45ba9ab6ca526163155234cf88287ff5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/538c51e9d124cf656f2dd0c0394a8545efc7102d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b7d1d8cb1bdca56aecebacd2896615da0acc126a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/81c58a206d1deee01f4c29236d4154c0872f2a38 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5a045c2f0fbf029873d2295178fa0785ade35af0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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