CVE-2025-21937

Local system crash via unchecked Bluetooth allocation

Published Apr 1, 2025 · Updated May 23, 2026

A null-pointer dereference in Linux kernel Bluetooth allows local users to crash the system by triggering remote-name processing. The mgmt_remote_name() path dereferences an allocation result from mgmt_alloc_skb() without checking whether the allocation returned null. A low-privileged local user must reach Bluetooth management remote-name handling; successful exploitation interrupts the host without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.20%
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 Linux kernel Bluetooth allows local users to crash the system by triggering remote-name processing. The mgmt_remote_name() path dereferences an allocation result from mgmt_alloc_skb() without checking whether the allocation returned null. A low-privileged local user must reach Bluetooth management remote-name handling; successful exploitation interrupts the host without reported data disclosure or modification.

The record

CVE
CVE-2025-21937
Published
Apr 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=0f526a6d3e9347d94c2c0b5292a3cb3b25115019
  2. Affected versionversion=5.17.2 <5.18
  3. Affected versionversion=5.18
  4. Affected versionversion=ba17bb62ce415950753c19d16bb43b2bd3701158 <37785a01040cb5d11ed0ddbcbf78491fcd073161
  5. Affected versionversion=ba17bb62ce415950753c19d16bb43b2bd3701158 <69fb168b88e4d62cb31cdd725b67ccc5216cfcaf
  6. Affected versionversion=ba17bb62ce415950753c19d16bb43b2bd3701158 <88310caff68ae69d0574859f7926a59c1da2d60b
  7. Affected versionversion=ba17bb62ce415950753c19d16bb43b2bd3701158 <c5845c73cbacf5704169283ef29ca02031a36564
  8. Affected versionversion=ba17bb62ce415950753c19d16bb43b2bd3701158 <f2176a07e7b19f73e05c805cf3d130a2999154cb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0f526a6d3e9347d94c2c0b5292a3cb3b25115019; version=5.17.2 <5.18; version=5.18; version=ba17bb62ce415950753c19d16bb43b2bd3701158 <37785a01040cb5d11ed0ddbcbf78491fcd073161; version=ba17bb62ce415950753c19d16bb43b2bd3701158 <69fb168b88e4d62cb31cdd725b67ccc5216cfcaf; version=ba17bb62ce415950753c19d16bb43b2bd3701158 <88310caff68ae69d0574859f7926a59c1da2d60b; version=ba17bb62ce415950753c19d16bb43b2bd3701158 <c5845c73cbacf5704169283ef29ca02031a36564; version=ba17bb62ce415950753c19d16bb43b2bd3701158 <f2176a07e7b19f73e05c805cf3d130a2999154cb

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499Endpoint Denial of Service

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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