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CVE-2026-45834— Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_state_change_cb()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于蓝牙L2CAP协议中l2cap_sock_state_change_cb函数缺少空指针检查，可能导致空指针取消引用。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 89bc500e41fc5b48e0573e6b0d927fc97b8951dc< 1b1c0da227bf63479bac9982fc8d12df9aaea0fb affected
89bc500e41fc5b48e0573e6b0d927fc97b8951dc< 85426e97dc72f2088ba6d27e74cd58c3fbd43e31 affected
89bc500e41fc5b48e0573e6b0d927fc97b8951dc< 0c17c8832562b2aac288e89cefd0f46074f54bcb affected
89bc500e41fc5b48e0573e6b0d927fc97b8951dc< 5105f3e6b2df619c635b5f6a49fac131a36c7952 affected
89bc500e41fc5b48e0573e6b0d927fc97b8951dc< c88c185ae0a1067823661b220aeea613df2c127b affected
89bc500e41fc5b48e0573e6b0d927fc97b8951dc< 1810e42ff6716f320c7269d5850eca48b07b7427 affected
89bc500e41fc5b48e0573e6b0d927fc97b8951dc< a2dcf1a61d056aef15b63c6eae9441344d624389 affected
89bc500e41fc5b48e0573e6b0d927fc97b8951dc< 2ff1a41a912de8517b4482e946dd951b7d80edbf affected
… +10 more rows
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I. Basic Information for CVE-2026-45834

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_state_change_cb()
Source: CVE Program / CVE List V5
Vulnerability Description
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().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于蓝牙L2CAP协议中l2cap_sock_state_change_cb函数缺少空指针检查，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 89bc500e41fc5b48e0573e6b0d927fc97b8951dc ~ 1b1c0da227bf63479bac9982fc8d12df9aaea0fb -
Linux Linux 3.1 -

II. Public POCs for CVE-2026-45834

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III. Intelligence Information for CVE-2026-45834

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Patches & Fixes for CVE-2026-45834 (8)

Same Patch Batch · Linux · 2026-05-26 · 3 CVEs total

CVE-2026-45835 Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_new_connection_cb()
CVE-2026-45836 Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_get_sndtimeo_cb()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45834

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