CVE-2026-64573 - Vulnerability Details

- Bluetooth: 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)

Published: 2026-08-05

Score: n/a

EPSS: n/a

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`427281f9498ed614f9aabc80e46ec077c487da6d`	affected	< 70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24
`2e4edfa1e2bd821a317e7d006517dcf2f3fac68d`	affected	< 59fd2f075bca94f030c7c78e94878ea0803d7690
`2e4edfa1e2bd821a317e7d006517dcf2f3fac68d`	affected	< a087ed960fce54e9302796229e9d545bbc9bcd4a
`2e4edfa1e2bd821a317e7d006517dcf2f3fac68d`	affected	< 4fcfb5b2c736785464ff9745f94c6726c5ee2d85
`2e4edfa1e2bd821a317e7d006517dcf2f3fac68d`	affected	< c90164ca0f7036942ba088eb7ea8d3f6c2352020
`ed53949cc92e28aaa3463d246942bda1fbb7f307`	affected	—
`1caceadfb50432dbf6d808796cb6c34ebb6d662c`	affected	—
`02f05ed44b71152d5e11d29be28aed91c0489b4e`	affected	—
`6.6.31`	affected	< 6.6.148
`5.15.159`	affected	< 5.16
`6.1.91`	affected	< 6.2
`6.8.10`	affected	< 6.9

Linux

affected

Version	Status	Constraints
`6.9`	affected	—
`0`	unaffected	< 6.9
`6.6.148`	unaffected	≤ 6.6.*
`6.12.101`	unaffected	≤ 6.12.*
`6.18.42`	unaffected	≤ 6.18.*
`7.1.6`	unaffected	≤ 7.1.*
`7.2-rc4`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[427281f9498ed614f9aabc80e46ec077c487da6d,70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24)`	affected	code_commit	—
`[2e4edfa1e2bd821a317e7d006517dcf2f3fac68d,59fd2f075bca94f030c7c78e94878ea0803d7690)`	affected	code_commit	—
`[2e4edfa1e2bd821a317e7d006517dcf2f3fac68d,a087ed960fce54e9302796229e9d545bbc9bcd4a)`	affected	code_commit	—
`[2e4edfa1e2bd821a317e7d006517dcf2f3fac68d,4fcfb5b2c736785464ff9745f94c6726c5ee2d85)`	affected	code_commit	—
`[2e4edfa1e2bd821a317e7d006517dcf2f3fac68d,c90164ca0f7036942ba088eb7ea8d3f6c2352020)`	affected	code_commit	—
`ed53949cc92e28aaa3463d246942bda1fbb7f307`	affected	code_commit	—
`1caceadfb50432dbf6d808796cb6c34ebb6d662c`	affected	code_commit	—
`02f05ed44b71152d5e11d29be28aed91c0489b4e`	affected	code_commit	—
`[6.6.31,6.6.148)`	affected	semver	—
`[5.15.159,5.16)`	affected	semver	—
`[6.1.91,6.2)`	affected	semver	—
`[6.8.10,6.9)`	affected	semver	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`6.9`	affected	generic	—
`[0,6.9)`	unaffected	generic	—
`[6.6.148,6.7.0)`	unaffected	semver	—
`[6.12.101,6.13.0)`	unaffected	semver	—
`[7.1.6,7.2.0)`	unaffected	semver	—
`[7.2-rc4,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/4fcfb5b2c736785464ff9745f94c6726c5ee2d85
https://git.kernel.org/stable/c/59fd2f075bca94f030c7c78e94878ea0803d7690
https://git.kernel.org/stable/c/70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24
https://git.kernel.org/stable/c/a087ed960fce54e9302796229e9d545bbc9bcd4a
https://git.kernel.org/stable/c/c90164ca0f7036942ba088eb7ea8d3f6c2352020

History

Wed, 05 Aug 2026 11:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-119 CWE-193

Wed, 05 Aug 2026 08:15:00 +0000

Type	Values Removed	Values Added
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)
Title		Bluetooth: qca: fix NVM tag length underflow in TLV parser
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/4fcfb5b2c736785464ff9745f94c6726c5ee2d85 https://git.kernel.org/stable/c/59fd2f075bca94f030c7c78e94878ea0803d7690 https://git.kernel.org/stable/c/70354dbb5f72d9a76da7b031de3cbaf6c7d8fc24 https://git.kernel.org/stable/c/a087ed960fce54e9302796229e9d545bbc9bcd4a https://git.kernel.org/stable/c/c90164ca0f7036942ba088eb7ea8d3f6c2352020

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-08-05T08:08:09.669Z

Updated: 2026-08-05T08:08:09.669Z

Reserved: 2026-07-19T15:36:31.797Z

Link: CVE-2026-64573

Vulnrichment

No data.

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-05T11:00:12Z

Weaknesses

CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-193
Off-by-one Error

Tracking

Subscriptions

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