GHSA-XX6F-XQ9M-7GMM
Vulnerability from github – Published: 2026-08-05 09:31 – Updated: 2026-08-05 09:31In 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)
{
"affected": [],
"aliases": [
"CVE-2026-64573"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-05T08:16:37Z",
"severity": null
},
"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\u0027d 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)",
"id": "GHSA-xx6f-xq9m-7gmm",
"modified": "2026-08-05T09:31:17Z",
"published": "2026-08-05T09:31:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64573"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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