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CVE-2026-45836— Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_get_sndtimeo_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_get_sndtimeo_cb函数缺少空指针检查，可能导致空指针取消引用。

AI Predicted 4.9 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8d836d71e2223b8961b21112bb4ce89ef8231682< fd072f833147b0bc10c43a454624cb99d02f3fc7 affected
8d836d71e2223b8961b21112bb4ce89ef8231682< 6e8d1a2a677a81caa60cf0aabd4217bd585fbba1 affected
8d836d71e2223b8961b21112bb4ce89ef8231682< e1863e7480feddb90125d0dd5a1b572972d75908 affected
8d836d71e2223b8961b21112bb4ce89ef8231682< cf1fd517f892ded88168df878f834b625133f86d affected
8d836d71e2223b8961b21112bb4ce89ef8231682< 58dc5e3d8768e121907608e6e196a908512fb083 affected
8d836d71e2223b8961b21112bb4ce89ef8231682< 32bd343803d4ba47cc516f9d5f037f01b855d767 affected
8d836d71e2223b8961b21112bb4ce89ef8231682< a93d66907dd4d29b65c9797a93784bf61906d6d6 affected
8d836d71e2223b8961b21112bb4ce89ef8231682< 78a88d43dab8d23aeef934ed8ce34d40e6b3d613 affected
… +10 more rows
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I. Basic Information for CVE-2026-45836

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_get_sndtimeo_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_get_sndtimeo_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_get_sndtimeo_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 8d836d71e2223b8961b21112bb4ce89ef8231682 ~ fd072f833147b0bc10c43a454624cb99d02f3fc7 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-45836

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III. Intelligence Information for CVE-2026-45836

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Patches & Fixes for CVE-2026-45836 (7)

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

CVE-2026-45834 Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_state_change_cb()
CVE-2026-45835 Bluetooth: L2CAP: Fix null-ptr-deref in l2cap_sock_new_connection_cb()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45836

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