CVE-2026-45834

Kernel crash via unchecked null L2CAP socket

Published May 26, 2026 · Updated May 26, 2026

Null pointer dereference in Linux Kernel Bluetooth L2CAP allows local users to crash the kernel during channel state changes. The l2cap_sock_state_change_cb() callback reads chan->data into sk and writes sk->sk_state without first checking whether sk is NULL. Reaching the faulty callback requires local low-privilege access; published materials do not disclose the exact trigger, and only availability is affected.

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

Null pointer dereference in Linux Kernel Bluetooth L2CAP allows local users to crash the kernel during channel state changes. The l2cap_sock_state_change_cb() callback reads chan->data into sk and writes sk->sk_state without first checking whether sk is NULL. Reaching the faulty callback requires local low-privilege access; published materials do not disclose the exact trigger, and only availability is affected.

The record

CVE
CVE-2026-45834
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.1
  2. Affected versionversion=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <1810e42ff6716f320c7269d5850eca48b07b7427
  3. Affected versionversion=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <2ff1a41a912de8517b4482e946dd951b7d80edbf
  4. Affected versionversion=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <5105f3e6b2df619c635b5f6a49fac131a36c7952
  5. Affected versionversion=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <a2dcf1a61d056aef15b63c6eae9441344d624389
  6. Affected versionversion=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <c88c185ae0a1067823661b220aeea613df2c127b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.1; version=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <1810e42ff6716f320c7269d5850eca48b07b7427; version=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <2ff1a41a912de8517b4482e946dd951b7d80edbf; version=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <5105f3e6b2df619c635b5f6a49fac131a36c7952; version=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <a2dcf1a61d056aef15b63c6eae9441344d624389; version=89bc500e41fc5b48e0573e6b0d927fc97b8951dc <c88c185ae0a1067823661b220aeea613df2c127b

Published CVSS scores

5.5NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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