Linux Kernel up to 7.2-rc2 Bluetooth bt_accept_dequeue use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k2.38

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2-rc2. It has been declared as very critical. The impacted element is the function bt_accept_dequeue of the component Bluetooth. The manipulation results in use after free. This vulnerability is cataloged as CVE-2026-64406. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 7.2-rc2. Affected is the function bt_accept_dequeue of the component Bluetooth. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-64406 since 07/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc3 eliminates this vulnerability. Applying the patch c0577c55219be42b6ea2ea8db11e85bfab6f4e8d/96ad400d5132eb333f28f6f1e2d58f0728ca9547/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0/c66a95e60b65d876a927123b0ed36bd6177d9ca6/6303ed4bbe0095f4cc195225479bf506e010d1db/26168db1ce5a9766cde021b18e590a101c056614/50c662bdcd51b03033a0abed6716bfd377ba1049/4bd0b274054f2679f28b70222b607bb0afc3ab9a is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
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

EPSS Score: 🔒
EPSS Percentile: 🔒

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 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc3
Patch: c0577c55219be42b6ea2ea8db11e85bfab6f4e8d/96ad400d5132eb333f28f6f1e2d58f0728ca9547/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0/c66a95e60b65d876a927123b0ed36bd6177d9ca6/6303ed4bbe0095f4cc195225479bf506e010d1db/26168db1ce5a9766cde021b18e590a101c056614/50c662bdcd51b03033a0abed6716bfd377ba1049/4bd0b274054f2679f28b70222b607bb0afc3ab9a

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64406 (🔒)
GCVE (CVE): GCVE-0-2026-64406
GCVE (VulDB): GCVE-100-383214

Entryinfo

Created: 07/25/2026 18:33
Changes: 07/25/2026 18:33 (59)
Complete: 🔍
Cache ID: 216::103

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