{"api_version":"1","generated_at":"2026-08-02T14:53:18+00:00","cve":"CVE-2026-64409","urls":{"html":"https://cve.report/CVE-2026-64409","api":"https://cve.report/api/cve/CVE-2026-64409.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64409","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64409"},"summary":{"title":"Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()\n\nEvery once in a while we see a hung btmtksdio_flush() task:\n\n INFO: task kworker/u17:0:189 blocked for more than 122 seconds.\n __cancel_work_timer+0x3f4/0x460\n cancel_work_sync+0x1c/0x2c\n btmtksdio_flush+0x2c/0x40\n hci_dev_open_sync+0x10c4/0x2190\n [..]\n\nIt all boils down to incorrect time_is_before_jiffies() usage in\nbtmtksdio_txrx_work().  The btmtksdio_txrx_work() loop is expected\nto be terminated if running for longer than 5*HZ.  However the\ntimeout check is twisted:  time_is_before_jiffies(old_jiffies + 5*HZ)\nevaluates to true when old_jiffies + 5*HZ is in the past i.e. when a\ntimeout has occurred.  Using OR with time_is_before_jiffies(txrx_timeout)\nmeans that:\n- before the 5-second timeout: the condition is `int_status || false`,\n  so it loops as long as there are pending interrupts.\n- after the 5-second timeout: the condition becomes `int_status || true`,\n  which is always true.\n\nWhen the loop becomes infinite btmtksdio_txrx_work() loop never\nterminates and never releases the SDIO host.\n\nFix loop termination condition to actually enforce a 5*HZ timeout.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:24","updated_at":"2026-07-25 10:17:24"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493","name":"https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544d","name":"https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26","name":"https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8","name":"https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52","name":"https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83d","name":"https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64409","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64409","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 26270bc189ea4b5a8356ec99561357fc87f00b32 f6682c23b6fac4780d297ae4662053d17e58fd52 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 26270bc189ea4b5a8356ec99561357fc87f00b32 466540e045d01fcacf383a5beb8a2dad2fc53a26 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 26270bc189ea4b5a8356ec99561357fc87f00b32 7b429d611060e87752e848851815537963726493 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 26270bc189ea4b5a8356ec99561357fc87f00b32 0039bdde36b23ccf1196635f1d52c5490481544d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 26270bc189ea4b5a8356ec99561357fc87f00b32 0f0a83e26a9c7fd4b243c315ce07161d2496d83d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 26270bc189ea4b5a8356ec99561357fc87f00b32 a257407e2bbbb099ed427719a50563f67fa366d8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64409","cve":"CVE-2026-64409","epss":"0.001730000","percentile":"0.069650000","score_date":"2026-07-28","updated_at":"2026-07-29 00:05:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/bluetooth/btmtksdio.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f6682c23b6fac4780d297ae4662053d17e58fd52","status":"affected","version":"26270bc189ea4b5a8356ec99561357fc87f00b32","versionType":"git"},{"lessThan":"466540e045d01fcacf383a5beb8a2dad2fc53a26","status":"affected","version":"26270bc189ea4b5a8356ec99561357fc87f00b32","versionType":"git"},{"lessThan":"7b429d611060e87752e848851815537963726493","status":"affected","version":"26270bc189ea4b5a8356ec99561357fc87f00b32","versionType":"git"},{"lessThan":"0039bdde36b23ccf1196635f1d52c5490481544d","status":"affected","version":"26270bc189ea4b5a8356ec99561357fc87f00b32","versionType":"git"},{"lessThan":"0f0a83e26a9c7fd4b243c315ce07161d2496d83d","status":"affected","version":"26270bc189ea4b5a8356ec99561357fc87f00b32","versionType":"git"},{"lessThan":"a257407e2bbbb099ed427719a50563f67fa366d8","status":"affected","version":"26270bc189ea4b5a8356ec99561357fc87f00b32","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/bluetooth/btmtksdio.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.17"},{"lessThan":"5.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"5.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()\n\nEvery once in a while we see a hung btmtksdio_flush() task:\n\n INFO: task kworker/u17:0:189 blocked for more than 122 seconds.\n __cancel_work_timer+0x3f4/0x460\n cancel_work_sync+0x1c/0x2c\n btmtksdio_flush+0x2c/0x40\n hci_dev_open_sync+0x10c4/0x2190\n [..]\n\nIt all boils down to incorrect time_is_before_jiffies() usage in\nbtmtksdio_txrx_work().  The btmtksdio_txrx_work() loop is expected\nto be terminated if running for longer than 5*HZ.  However the\ntimeout check is twisted:  time_is_before_jiffies(old_jiffies + 5*HZ)\nevaluates to true when old_jiffies + 5*HZ is in the past i.e. when a\ntimeout has occurred.  Using OR with time_is_before_jiffies(txrx_timeout)\nmeans that:\n- before the 5-second timeout: the condition is `int_status || false`,\n  so it loops as long as there are pending interrupts.\n- after the 5-second timeout: the condition becomes `int_status || true`,\n  which is always true.\n\nWhen the loop becomes infinite btmtksdio_txrx_work() loop never\nterminates and never releases the SDIO host.\n\nFix loop termination condition to actually enforce a 5*HZ timeout."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:50:50.604Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52"},{"url":"https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26"},{"url":"https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493"},{"url":"https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544d"},{"url":"https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83d"},{"url":"https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8"}],"title":"Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64409","datePublished":"2026-07-25T08:50:50.604Z","dateReserved":"2026-07-19T15:36:31.786Z","dateUpdated":"2026-07-25T08:50:50.604Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:24","lastModifiedDate":"2026-07-25 10:17:24","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64409","Ordinal":"1","Title":"Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()","CVE":"CVE-2026-64409","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64409","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()\n\nEvery once in a while we see a hung btmtksdio_flush() task:\n\n INFO: task kworker/u17:0:189 blocked for more than 122 seconds.\n __cancel_work_timer+0x3f4/0x460\n cancel_work_sync+0x1c/0x2c\n btmtksdio_flush+0x2c/0x40\n hci_dev_open_sync+0x10c4/0x2190\n [..]\n\nIt all boils down to incorrect time_is_before_jiffies() usage in\nbtmtksdio_txrx_work().  The btmtksdio_txrx_work() loop is expected\nto be terminated if running for longer than 5*HZ.  However the\ntimeout check is twisted:  time_is_before_jiffies(old_jiffies + 5*HZ)\nevaluates to true when old_jiffies + 5*HZ is in the past i.e. when a\ntimeout has occurred.  Using OR with time_is_before_jiffies(txrx_timeout)\nmeans that:\n- before the 5-second timeout: the condition is `int_status || false`,\n  so it loops as long as there are pending interrupts.\n- after the 5-second timeout: the condition becomes `int_status || true`,\n  which is always true.\n\nWhen the loop becomes infinite btmtksdio_txrx_work() loop never\nterminates and never releases the SDIO host.\n\nFix loop termination condition to actually enforce a 5*HZ timeout.","Type":"Description","Title":"Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()"}]}}}