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

Description

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)

Timeline

Scores

No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.

EPSS (exploitation in 30 days)

0.16% · top 95% of all CVEs (14 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.

Affected products

• Linux · Linux

  • affected ed53949cc92e28aaa3463d246942bda1fbb7f307 – < a7ee11441d71ab036a705d110a415421f5a4a898
  • affected 1caceadfb50432dbf6d808796cb6c34ebb6d662c – < 5d34e537755d2f9eba2d4e54d70126f987ef20b4
  • affected 427281f9498ed614f9aabc80e46ec077c487da6d – < 70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24
  • affected 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d – < 59fd2f075bca94f030c7c78e94878ea0803d7690
  • affected 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d – < a087ed960fce54e9302796229e9d545bbc9bcd4a
  • affected 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d – < 4fcfb5b2c736785464ff9745f94c6726c5ee2d85
  • affected 2e4edfa1e2bd821a317e7d006517dcf2f3fac68d – < c90164ca0f7036942ba088eb7ea8d3f6c2352020
  • affected 02f05ed44b71152d5e11d29be28aed91c0489b4e
  • affected 5.15.159 – < 5.15.216
  • affected 6.1.91 – < 6.1.183
  • affected 6.6.31 – < 6.6.148
  • affected 6.8.10 – < 6.9

• Linux · Linux

  • affected 6.9
  • unaffected < 6.9
  • unaffected 5.15.216 – ≤ 5.15.*
  • unaffected 6.1.183 – ≤ 6.1.*
  • unaffected 6.6.148 – ≤ 6.6.*
  • unaffected 6.12.101 – ≤ 6.12.*
  • unaffected 6.18.42 – ≤ 6.18.*
  • unaffected 7.1.6 – ≤ 7.1.*
  • unaffected 7.2 – ≤ *

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-53267 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-64573](https://cveledger.app/badge/CVE-2026-64573.svg)](https://cveledger.app/cve/CVE-2026-64573)

Record last updated 19 Aug 2026, 16:28 UTC.