CVE-2026-45836

Local system crash via unchecked L2CAP socket pointer

Published May 26, 2026 · Updated May 26, 2026

A NULL pointer dereference in the Linux Kernel Bluetooth L2CAP subsystem allows local users to crash the system through a socket callback. The l2cap_sock_get_sndtimeo_cb() callback assigns chan->data to sk and reads sk->sk_sndtimeo without first checking whether sk is NULL. Low-privileged local access and an L2CAP channel with a NULL socket pointer are required; the bounded consequence is a kernel crash and service interrupt.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux Kernel Bluetooth L2CAP subsystem allows local users to crash the system through a socket callback. The l2cap_sock_get_sndtimeo_cb() callback assigns chan->data to sk and reads sk->sk_sndtimeo without first checking whether sk is NULL. Low-privileged local access and an L2CAP channel with a NULL socket pointer are required; the bounded consequence is a kernel crash and service interrupt.

The record

CVE
CVE-2026-45836
Published
May 26, 2026
Updated
May 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.13
  2. Affected versionversion=8d836d71e2223b8961b21112bb4ce89ef8231682 <32bd343803d4ba47cc516f9d5f037f01b855d767
  3. Affected versionversion=8d836d71e2223b8961b21112bb4ce89ef8231682 <58dc5e3d8768e121907608e6e196a908512fb083
  4. Affected versionversion=8d836d71e2223b8961b21112bb4ce89ef8231682 <78a88d43dab8d23aeef934ed8ce34d40e6b3d613
  5. Affected versionversion=8d836d71e2223b8961b21112bb4ce89ef8231682 <a93d66907dd4d29b65c9797a93784bf61906d6d6
  6. Affected versionversion=8d836d71e2223b8961b21112bb4ce89ef8231682 <cf1fd517f892ded88168df878f834b625133f86d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.13; version=8d836d71e2223b8961b21112bb4ce89ef8231682 <32bd343803d4ba47cc516f9d5f037f01b855d767; version=8d836d71e2223b8961b21112bb4ce89ef8231682 <58dc5e3d8768e121907608e6e196a908512fb083; version=8d836d71e2223b8961b21112bb4ce89ef8231682 <78a88d43dab8d23aeef934ed8ce34d40e6b3d613; version=8d836d71e2223b8961b21112bb4ce89ef8231682 <a93d66907dd4d29b65c9797a93784bf61906d6d6; version=8d836d71e2223b8961b21112bb4ce89ef8231682 <cf1fd517f892ded88168df878f834b625133f86d

Published CVSS scores

6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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