{"id":"CVE-2026-46140","state":"PUBLISHED","title":"Bluetooth: btmtk: validate WMT event SKB length before struct access","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtk: validate WMT event SKB length before struct access\n\nbtmtk_usb_hci_wmt_sync() casts the WMT event response SKB data to\nstruct btmtk_hci_wmt_evt (7 bytes) and struct btmtk_hci_wmt_evt_funcc\n(9 bytes) without first checking that the SKB contains enough data.\nA short firmware response causes out-of-bounds reads from SKB tailroom.\n\nUse skb_pull_data() to validate and advance past the base WMT event\nheader. For the FUNC_CTRL case, pull the additional status field bytes\nbefore accessing them.","publishedAt":"2026-05-28T09:35:56.104Z","updatedAt":"2026-07-04T11:50:42.029Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f0457842215438786e2e205ad06a4fbb8ab63cd0","status":"affected","lessThan":"36c85f7029484d5ede769f8873d16e9c8e35533c","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"c411cf1bfde951cfa821809cf4020ba177f76e0c","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"624fb79dadc1b65757986a9d0fdde5c0cf3fe179","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"70d37a8b9229e394cc17ddad47e90b81d80fcd09","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"634a4408c0615c523cf7531790f4f14a422b9206","versionType":"git"},{"version":"6.6.142","status":"affected","lessThan":"6.6.144","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btmtk.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.6.144","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btmtk.c"]}],"references":["https://git.kernel.org/stable/c/36c85f7029484d5ede769f8873d16e9c8e35533c","https://git.kernel.org/stable/c/c411cf1bfde951cfa821809cf4020ba177f76e0c","https://git.kernel.org/stable/c/624fb79dadc1b65757986a9d0fdde5c0cf3fe179","https://git.kernel.org/stable/c/70d37a8b9229e394cc17ddad47e90b81d80fcd09","https://git.kernel.org/stable/c/634a4408c0615c523cf7531790f4f14a422b9206"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46140.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46140","state":"PUBLISHED","datePublished":"2026-05-28T09:35:56.104Z","dateUpdated":"2026-07-04T11:50:42.029Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.100Z"},"containers":{"cna":{"title":"Bluetooth: btmtk: validate WMT event SKB length before struct access","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtk: validate WMT event SKB length before struct access\n\nbtmtk_usb_hci_wmt_sync() casts the WMT event response SKB data to\nstruct btmtk_hci_wmt_evt (7 bytes) and struct btmtk_hci_wmt_evt_funcc\n(9 bytes) without first checking that the SKB contains enough data.\nA short firmware response causes out-of-bounds reads from SKB tailroom.\n\nUse skb_pull_data() to validate and advance past the base WMT event\nheader. For the FUNC_CTRL case, pull the additional status field bytes\nbefore accessing them."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f0457842215438786e2e205ad06a4fbb8ab63cd0","status":"affected","lessThan":"36c85f7029484d5ede769f8873d16e9c8e35533c","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"c411cf1bfde951cfa821809cf4020ba177f76e0c","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"624fb79dadc1b65757986a9d0fdde5c0cf3fe179","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"70d37a8b9229e394cc17ddad47e90b81d80fcd09","versionType":"git"},{"version":"d019930b0049fc2648a6b279893d8ad330596e81","status":"affected","lessThan":"634a4408c0615c523cf7531790f4f14a422b9206","versionType":"git"},{"version":"6.6.142","status":"affected","lessThan":"6.6.144","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btmtk.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.6.144","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/bluetooth/btmtk.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/36c85f7029484d5ede769f8873d16e9c8e35533c"},{"url":"https://git.kernel.org/stable/c/c411cf1bfde951cfa821809cf4020ba177f76e0c"},{"url":"https://git.kernel.org/stable/c/624fb79dadc1b65757986a9d0fdde5c0cf3fe179"},{"url":"https://git.kernel.org/stable/c/70d37a8b9229e394cc17ddad47e90b81d80fcd09"},{"url":"https://git.kernel.org/stable/c/634a4408c0615c523cf7531790f4f14a422b9206"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-04T11:50:42.029Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.142","versionEndExcluding":"6.6.144"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}