Linux Kernel up to 7.2-rc3 Bluetooth qca_controller_memdump use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k2.49-

Summaryinfo

A vulnerability marked as very critical has been reported in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.5/7.2-rc3. This affects the function qca_controller_memdump of the component Bluetooth. This manipulation causes use after free. The identification of this vulnerability is CVE-2026-68389. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.6.147/6.12.100/6.18.41/7.1.5/7.2-rc3 and classified as very critical. Affected by this vulnerability is the function qca_controller_memdump of the component Bluetooth. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_qca: Clear memdump state on invalid dump size qca_controller_memdump() allocates qca->qca_memdump before processing the first dump packet. For a sequence-zero packet it then disables IBS, marks memdump collection active, and reads the advertised dump size. If the controller reports a zero dump size, the error path frees the local qca_memdump object and returns without clearing qca->qca_memdump or undoing the collection state. A later memdump work item initializes its local pointer from qca->qca_memdump and skips allocation when that pointer is non-NULL, so it can operate on freed memory. The stale collection and IBS-disabled flags can also leave waiters or later transmit handling blocked behind an aborted dump. Clear the saved pointer and memdump state before returning from the invalid-size path, matching the cleanup used when hci_devcd_init() fails. A static analysis checker reported the stale memdump state, and manual source review confirmed the invalid-size failure path.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-68389 since 07/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/10/2026).

Upgrading to version 6.6.148, 6.12.101, 6.18.42, 7.1.6 or 7.2-rc4 eliminates this vulnerability. Applying the patch 5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a/069258d5111eed9ac9586bee42d03d38e2975715/cefb44c367b2b52e50f97bc8526d39df9bcf5e60/2363a757694752426fc47f3eadde15cf5f791fa5/bf587a10c33e5571a299742e45bc18960b9912e7 is able to eliminate this problem.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.148/6.12.101/6.18.42/7.1.6/7.2-rc4
Patch: 5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a/069258d5111eed9ac9586bee42d03d38e2975715/cefb44c367b2b52e50f97bc8526d39df9bcf5e60/2363a757694752426fc47f3eadde15cf5f791fa5/bf587a10c33e5571a299742e45bc18960b9912e7

Timelineinfo

07/30/2026 CVE reserved
08/10/2026 +11 days Advisory disclosed
08/10/2026 +0 days VulDB entry created
08/10/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-68389 (🔒)
GCVE (CVE): GCVE-0-2026-68389
GCVE (VulDB): GCVE-100-387769

Entryinfo

Created: 08/10/2026 18:34
Changes: 08/10/2026 18:34 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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