Linux Kernel up to 7.1-rc2 Bluetooth l2cap_sock_state_change_cb null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.6.139/6.12.87/6.18.29/7.0.6/7.1-rc2. This impacts the function l2cap_sock_state_change_cb of the component Bluetooth. The manipulation leads to null pointer dereference. This vulnerability is listed as CVE-2026-45834. The attack must be carried out from within the local network. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.139/6.12.87/6.18.29/7.0.6/7.1-rc2 and classified as critical. This issue affects the function l2cap_sock_state_change_cb of the component Bluetooth. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_state_change_cb() Add the same NULL guard already present in l2cap_sock_resume_cb() and l2cap_sock_ready_cb().

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-45834 since 05/13/2026. The exploitation is known to be easy. Access to the local network is required for this attack to succeed. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 325059 (Debian dla-4665 : affs-modules-6.1.0-48-4kc-malta-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.140, 6.12.88, 6.18.30, 7.0.7 or 7.1-rc3 eliminates this vulnerability. Applying the patch 5105f3e6b2df619c635b5f6a49fac131a36c7952/c88c185ae0a1067823661b220aeea613df2c127b/1810e42ff6716f320c7269d5850eca48b07b7427/a2dcf1a61d056aef15b63c6eae9441344d624389/2ff1a41a912de8517b4482e946dd951b7d80edbf 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 vulnerability database at Tenable (325059). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 325059
Nessus Name: Debian dla-4665 : affs-modules-6.1.0-48-4kc-malta-di - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.140/6.12.88/6.18.30/7.0.7/7.1-rc3
Patch: 5105f3e6b2df619c635b5f6a49fac131a36c7952/c88c185ae0a1067823661b220aeea613df2c127b/1810e42ff6716f320c7269d5850eca48b07b7427/a2dcf1a61d056aef15b63c6eae9441344d624389/2ff1a41a912de8517b4482e946dd951b7d80edbf

Timelineinfo

05/13/2026 CVE reserved
05/26/2026 +13 days Advisory disclosed
05/26/2026 +0 days VulDB entry created
07/06/2026 +40 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-45834 (🔒)
GCVE (CVE): GCVE-0-2026-45834
GCVE (VulDB): GCVE-100-365693

Entryinfo

Created: 05/26/2026 19:36
Updated: 07/06/2026 01:10
Changes: 05/26/2026 19:36 (59), 06/26/2026 21:05 (10), 07/06/2026 01:10 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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