CVE-2026-46140
In 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.
Affected versions
Linux kernel versions
6.6.142,
6.11
and later are affected. Fixed in
6.12.88,
6.18.30,
7.0.7,
7.1-rc3
and their respective stable series.
References
The following references provide additional information about CVE-2026-46140 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/624fb79dadc1b65757986a9d0fdde5c0cf3fe179
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PatchKernel patch commithttps://git.kernel.org/stable/c/634a4408c0615c523cf7531790f4f14a422b9206
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PatchKernel patch commithttps://git.kernel.org/stable/c/70d37a8b9229e394cc17ddad47e90b81d80fcd09
Frequently asked questions
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What is CVE-2026-46140?
CVE-2026-46140 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.142 onward and has been patched in 6.12.88, 6.18.30, 7.0.7 and others. CVE-2026-46140 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-46140?
Yes — CVE-2026-46140 has been patched. Fixed versions include 6.12.88, 6.18.30, 7.0.7 and others. If you are running Linux kernel 6.6.142 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-46140 actively exploited?
No — CVE-2026-46140 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.