{"id":"CVE-2026-64573","summary":"Bluetooth: qca: fix NVM tag length underflow in TLV parser","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: qca: fix NVM tag length underflow in TLV parser\n\nIn the TLV_TYPE_NVM branch of qca_tlv_check_data() the tag loop bound is\n\"while (idx \u003c length - sizeof(struct tlv_type_nvm))\". \"length\" is a signed\nint from the firmware TLV header and sizeof(struct tlv_type_nvm) is a\nsize_t (12), so \"length\" is converted to size_t and any firmware-supplied\n\"length\" \u003c 12 makes the subtraction wrap to a huge value. The loop body\nthen reads a 12-byte struct tlv_type_nvm past the end of the short\nvmalloc'd firmware buffer (and the EDL_TAG_ID_* handlers can write past it).\n\nRewrite the bound as \"idx + sizeof(struct tlv_type_nvm) \u003c= length\"; both\noperands are non-negative, so it no longer underflows and a \"length\" too\nsmall for one record correctly skips the loop.\n\n  BUG: KASAN: vmalloc-out-of-bounds in qca_download_firmware.isra.0 (drivers/bluetooth/btqca.c:421)\n  Read of size 2 at addr ffffc900000e5004 by task kworker/u9:0/52\n  Workqueue: hci0 hci_power_on\n  Call Trace:\n   ...\n   kasan_report (mm/kasan/report.c:595)\n   qca_download_firmware.isra.0 (drivers/bluetooth/btqca.c:421 drivers/bluetooth/btqca.c:617)\n   qca_uart_setup (drivers/bluetooth/btqca.c:948)\n   qca_setup (drivers/bluetooth/hci_qca.c:2029)\n   hci_uart_setup (drivers/bluetooth/hci_ldisc.c:438)\n   hci_dev_open_sync (net/bluetooth/hci_sync.c:5227)\n   hci_power_on (net/bluetooth/hci_core.c:920)\n   process_one_work (kernel/workqueue.c:3322)\n   worker_thread (kernel/workqueue.c:3486)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n   ret_from_fork_asm (arch/x86/entry/entry_64.S:245)","modified":"2026-08-06T03:48:28.558664806Z","published":"2026-08-05T08:08:09.669Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64573.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4fcfb5b2c736785464ff9745f94c6726c5ee2d85"},{"type":"WEB","url":"https://git.kernel.org/stable/c/59fd2f075bca94f030c7c78e94878ea0803d7690"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a087ed960fce54e9302796229e9d545bbc9bcd4a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c90164ca0f7036942ba088eb7ea8d3f6c2352020"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64573.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64573"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"427281f9498ed614f9aabc80e46ec077c487da6d"},{"fixed":"70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2e4edfa1e2bd821a317e7d006517dcf2f3fac68d"},{"fixed":"59fd2f075bca94f030c7c78e94878ea0803d7690"},{"fixed":"a087ed960fce54e9302796229e9d545bbc9bcd4a"},{"fixed":"4fcfb5b2c736785464ff9745f94c6726c5ee2d85"},{"fixed":"c90164ca0f7036942ba088eb7ea8d3f6c2352020"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"ed53949cc92e28aaa3463d246942bda1fbb7f307"},{"last_affected":"1caceadfb50432dbf6d808796cb6c34ebb6d662c"},{"last_affected":"02f05ed44b71152d5e11d29be28aed91c0489b4e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.31"},{"fixed":"6.6.148"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.159"},{"fixed":"5.16"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.91"},{"fixed":"6.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.8.10"},{"fixed":"6.9"}]}],"versions":["v6.6.147","v6.6.146","v6.6.145","v6.6.144","v6.6.143","v6.6.142","v6.6.141","v6.6.140","v6.6.139","v6.6.138","v6.6.137","v6.6.136","v6.6.135","v6.6.134","v6.6.133","v6.6.132","v6.6.131","v6.6.130","v6.6.129","v6.6.128","v6.6.127","v6.6.126","v6.6.125","v6.6.124","v6.6.123","v6.6.122","v6.6.121","v6.6.120","v6.6.119","v6.6.118","v6.6.117","v6.6.116","v6.6.115","v6.6.114","v6.6.113","v6.6.112","v6.6.111","v6.6.110","v6.6.109","v6.6.108","v6.6.107","v6.6.106","v6.6.105","v6.6.104","v6.6.103","v6.6.102","v6.6.101","v6.6.100","v6.6.99","v6.6.98","v6.6.97","v6.6.96","v6.6.95","v6.6.94","v6.6.93","v6.6.92","v6.6.91","v6.6.90","v6.6.89","v6.6.88","v6.6.87","v6.6.86","v6.6.85","v6.6.84","v6.6.83","v6.6.82","v6.6.81","v6.6.80","v6.6.79","v6.6.78","v6.6.77","v6.6.76","v6.6.75","v6.6.74","v6.6.73","v6.6.72","v6.6.71","v6.6.70","v6.6.69","v6.6.68","v6.6.67","v6.6.66","v6.6.65","v6.6.64","v6.6.63","v6.6.62","v6.6.61","v6.6.60","v6.6.59","v6.6.58","v6.6.57","v6.6.56","v6.6.55","v6.6.54","v6.6.53","v6.6.52","v6.6.51","v6.6.50","v6.6.49","v6.6.48","v6.6.47","v6.6.46","v6.6.45","v6.6.44","v6.6.43","v6.6.42","v6.6.41","v6.6.40","v6.6.39","v6.6.38","v6.6.37","v6.6.36","v6.6.35","v6.6.34","v6.6.33","v6.6.32","v6.6.31","v6.8.9","v6.1.90","v5.15.158","v6.8","v6.8.8","v6.1.89","v5.15.157","v6.1.88","v6.8.7","v6.1.87","v5.15.156","v6.8-rc1","v6.8.6","v6.1.86","v5.15.155","v6.8.5","v6.1.85","v5.15.154","v6.8.4","v6.1.84","v5.15.153","v6.8.3","v6.8.2","v6.1.83","v5.15.152","v6.1.82","v6.8.1","v6.7-rc1","v6.8-rc7","v6.1.81","v5.15.151","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.1.80","v5.15.150","v6.1.79","v5.15.149","v6.1.78","v5.15.148","v6.1.77","v6.1.76","v6.1.75","v6.1.74","v5.15.147","v6.7","v6.1.73","v6.7-rc3","v6.7-rc8","v6.1.72","v5.15.146","v6.7-rc7","v6.1.71","v6.1.70","v5.15.145","v6.7-rc6","v6.1.69","v5.15.144","v6.7-rc2","v6.1.68","v5.15.143","v6.7-rc4","v6.7-rc5","v6.1.67","v5.15.142","v6.1.66","v6.1.65","v5.15.141","v6.6","v6.1.64","v5.15.140","v6.1.63","v5.15.139","v6.1.62","v5.15.138","v6.6-rc1","v5.15.137","v6.1.61","v6.1.60","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.1.59","v5.15.136","v6.1.58","v5.15.135","v6.6-rc2","v6.1.57","v6.1.56","v5.15.134","v6.1.55","v5.15.133","v6.5","v6.1.54","v5.15.132","v6.5-rc1","v6.1.53","v5.15.131","v6.1.52","v6.5-rc2","v5.15.130","v6.1.51","v6.5-rc7","v5.15.129","v6.1.50","v5.15.128","v6.1.49","v6.1.48","v5.15.127","v6.1.47","v6.5-rc4","v6.5-rc3","v6.1.46","v6.5-rc6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