CVE-2025-38593

Kernel crash via Bluetooth UUID array double free

Published Aug 19, 2025 · Updated Aug 5, 2026

Double free in the Linux kernel Bluetooth subsystem allows local users to crash the kernel through concurrent discovery requests. Within hci_discovery_filter_clear(), one path frees the shared uuids array before setting its pointer to NULL, allowing a preempting discovery path to free the same allocation again. Low-privileged local access to the Bluetooth HCI socket path and a narrow race window are required; a successful trigger produces a kernel Oops and interrupts service.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Double free in the Linux kernel Bluetooth subsystem allows local users to crash the kernel through concurrent discovery requests. Within hci_discovery_filter_clear(), one path frees the shared uuids array before setting its pointer to NULL, allowing a preempting discovery path to free the same allocation again. Low-privileged local access to the Bluetooth HCI socket path and a narrow race window are required; a successful trigger produces a kernel Oops and interrupts service.

The record

CVE
CVE-2025-38593
Published
Aug 19, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.17
  2. Affected versionversion=ad383c2c65a5baf16e334cd40a013cc302176891 <16852eccbdfaf41a666705e3f8be55cf2864c5ca
  3. Affected versionversion=ad383c2c65a5baf16e334cd40a013cc302176891 <2935e556850e9c94d7a00adf14d3cd7fe406ac03
  4. Affected versionversion=ad383c2c65a5baf16e334cd40a013cc302176891 <7ce9bb0b95fc280e9212b8922590c492ca1d9c39
  5. Affected versionversion=ad383c2c65a5baf16e334cd40a013cc302176891 <86f3dcd1f331cfd4fd7ec88906955134ec51afbe
  6. Affected versionversion=ad383c2c65a5baf16e334cd40a013cc302176891 <a351ff6b8ecca4229afaa0d98042bead8de64799
  7. Affected versionversion=ad383c2c65a5baf16e334cd40a013cc302176891 <f8069f34c4c976786ded97498012225af87435d7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=ad383c2c65a5baf16e334cd40a013cc302176891 <16852eccbdfaf41a666705e3f8be55cf2864c5ca; version=ad383c2c65a5baf16e334cd40a013cc302176891 <2935e556850e9c94d7a00adf14d3cd7fe406ac03; version=ad383c2c65a5baf16e334cd40a013cc302176891 <7ce9bb0b95fc280e9212b8922590c492ca1d9c39; version=ad383c2c65a5baf16e334cd40a013cc302176891 <86f3dcd1f331cfd4fd7ec88906955134ec51afbe; version=ad383c2c65a5baf16e334cd40a013cc302176891 <a351ff6b8ecca4229afaa0d98042bead8de64799; version=ad383c2c65a5baf16e334cd40a013cc302176891 <f8069f34c4c976786ded97498012225af87435d7

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-415Double Free
T1499.004Application 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo