Bluetooth: btmtk: validate WMT event SKB length before struct access

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Summary

CVECVE-2026-46140
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:29 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: Bluetooth: btmtk: validate WMT event SKB length before struct access btmtk_usb_hci_wmt_sync() casts the WMT event response SKB data to struct btmtk_hci_wmt_evt (7 bytes) and struct btmtk_hci_wmt_evt_funcc (9 bytes) without first checking that the SKB contains enough data. A short firmware response causes out-of-bounds reads from SKB tailroom. Use skb_pull_data() to validate and advance past the base WMT event header. For the FUNC_CTRL case, pull the additional status field bytes before accessing them.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.048040000 (date 2026-06-02)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d019930b0049fc2648a6b279893d8ad330596e81 c411cf1bfde951cfa821809cf4020ba177f76e0c git Not specified
CNA Linux Linux affected d019930b0049fc2648a6b279893d8ad330596e81 624fb79dadc1b65757986a9d0fdde5c0cf3fe179 git Not specified
CNA Linux Linux affected d019930b0049fc2648a6b279893d8ad330596e81 70d37a8b9229e394cc17ddad47e90b81d80fcd09 git Not specified
CNA Linux Linux affected d019930b0049fc2648a6b279893d8ad330596e81 634a4408c0615c523cf7531790f4f14a422b9206 git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.12.88 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/634a4408c0615c523cf7531790f4f14a422b9206 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/624fb79dadc1b65757986a9d0fdde5c0cf3fe179 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/70d37a8b9229e394cc17ddad47e90b81d80fcd09 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c411cf1bfde951cfa821809cf4020ba177f76e0c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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