Linux Kernel up to 6.6.130/6.12.79/6.18.20/6.19.10/7.0-rc5 Bluetooth sco_recv_frame use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.6$5k-$25k4.71-

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.6.130/6.12.79/6.18.20/6.19.10/7.0-rc5. Affected is the function sco_recv_frame of the component Bluetooth. Performing a manipulation results in use after free. This vulnerability is reported as CVE-2026-31408. The attacker must have access to the local network to execute the attack. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.130/6.12.79/6.18.20/6.19.10/7.0-rc5. It has been classified as critical. This affects the function sco_recv_frame 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. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately releases the lock without holding a reference to the socket. A concurrent close() can free the socket between the lock release and the subsequent sk->sk_state access, resulting in a use-after-free. Other functions in the same file (sco_sock_timeout(), sco_conn_del()) correctly use sco_sock_hold() to safely hold a reference under the lock. Fix by using sco_sock_hold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-31408 since 03/09/2026. The exploitability is told to be easy. The attack can only be initiated within the local network. 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 04/06/2026).

The vulnerability scanner Nessus provides a plugin with the ID 305060 (Linux Distros Unpatched Vulnerability : CVE-2026-31408), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.131, 6.12.80, 6.18.21, 6.19.11 or 7.0-rc6 eliminates this vulnerability. Applying the patch 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1/108b81514d8f2535eb16651495cefb2250528db3/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e/e76e8f0581ef555eacc11dbb095e602fb30a5361/598dbba9919c5e36c54fe1709b557d64120cb94b is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (305060) and EUVD (EUVD-2026-19196). 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: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
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: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305060
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-31408

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.131/6.12.80/6.18.21/6.19.11/7.0-rc6
Patch: 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1/108b81514d8f2535eb16651495cefb2250528db3/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e/e76e8f0581ef555eacc11dbb095e602fb30a5361/598dbba9919c5e36c54fe1709b557d64120cb94b

Timelineinfo

03/09/2026 CVE reserved
04/06/2026 +27 days Advisory disclosed
04/06/2026 +0 days VulDB entry created
04/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31408 (🔒)
GCVE (CVE): GCVE-0-2026-31408
GCVE (VulDB): GCVE-100-355497
EUVD: 🔒

Entryinfo

Created: 04/06/2026 10:21
Updated: 04/06/2026 23:18
Changes: 04/06/2026 10:21 (59), 04/06/2026 12:30 (1), 04/06/2026 23:18 (2)
Complete: 🔍
Cache ID: 216:752:103

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

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