Not yet scoredPublished Aug 5, 2026

CVE-2026-64573Bluetooth: qca: fix NVM tag length underflow in TLV parser

Updated under an hour ago (Oct 27, 2026, 12:30 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: qca: fix NVM tag length underflow in TLV parser In the TLV_TYPE_NVM branch of qca_tlv_check_data() the tag loop bound is "while (idx < length - sizeof(struct tlv_type_nvm))". "length" is a signed int from the firmware TLV header and sizeof(struct tlv_type_nvm) is a size_t (12), so "length" is converted to size_t and any firmware-supplied "length" < 12 makes the subtraction wrap to a huge value. The loop body then reads a 12-byte struct tlv_type_nvm past the end of the short vmalloc'd firmware buffer (and the EDL_TAG_ID_* handlers can write past it). Rewrite the bound as "idx + sizeof(struct tlv_type_nvm) <= length"; both operands are non-negative, so it no longer underflows and a "length" too small for one record correctly skips the loop. BUG: KASAN: vmalloc-out-of-bounds in qca_download_firmware.isra.0 (drivers/bluetooth/btqca.c:421) Read of size 2 at addr ffffc900000e5004 by task kworker/u9:0/52 Workqueue: hci0 hci_power_on Call Trace: ... kasan_report (mm/kasan/report.c:595) qca_download_firmware.isra.0 (drivers/bluetooth/btqca.c:421 drivers/bluetooth/btqca.c:617) qca_uart_setup (drivers/bluetooth/btqca.c:948) qca_setup (drivers/bluetooth/hci_qca.c:2029) hci_uart_setup (drivers/bluetooth/hci_ldisc.c:438) hci_dev_open_sync (net/bluetooth/hci_sync.c:5227) hci_power_on (net/bluetooth/hci_core.c:920) process_one_work (kernel/workqueue.c:3322) worker_thread (kernel/workqueue.c:3486) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245)

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from ed53949cc92e28aaa3463d246942bda1fbb7f307 before a7ee11441d71ab036a705d110a415421f5a4a898; from 1caceadfb50432dbf6d808796cb6c34ebb6d662c before 5d34e537755d2f9eba2d4e54d70126f987ef20b4; 427281f9498ed614f9aabc80e46ec077c487da6d builds before 70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24; from 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d before 59fd2f075bca94f030c7c78e94878ea0803d7690; from 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d before a087ed960fce54e9302796229e9d545bbc9bcd4a; from 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d before 4fcfb5b2c736785464ff9745f94c6726c5ee2d85; from 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d before c90164ca0f7036942ba088eb7ea8d3f6c2352020; 02f05ed44b71152d5e11d29be28aed91c0489b4e; and 4 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/a7ee11441d71ab036a705d110a415421f5a4a898
https://git.kernel.org/stable/c/5d34e537755d2f9eba2d4e54d70126f987ef20b4
https://git.kernel.org/stable/c/70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24
https://git.kernel.org/stable/c/59fd2f075bca94f030c7c78e94878ea0803d7690
https://git.kernel.org/stable/c/a087ed960fce54e9302796229e9d545bbc9bcd4a
https://git.kernel.org/stable/c/4fcfb5b2c736785464ff9745f94c6726c5ee2d85
https://git.kernel.org/stable/c/c90164ca0f7036942ba088eb7ea8d3f6c2352020

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.