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Review reviewHigh

CVE-2025-38593

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()' Function 'hci_discovery_filter_clear()' frees 'uuids' array and then sets it to NULL. There is a tiny chance of the following race: 'hci_cmd_sync_work()' 'update_passive_scan_sync()' 'hci_update_passive_scan_sync()' 'hci_discovery_filter_clear()' kfree(uuids); <-------------------------preempted--------------------------------> 'start_service_discovery()' 'hci_discovery_filter_clear()' kfree(uuids); // DOUBLE FREE <-------------------------preempted-----...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.08.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()' Function 'hci_discovery_filter_clear()' frees 'uuids' array and then sets it to NULL. There is a tiny chance of the following race: 'hci_cmd_sync_work()' 'update_passive_scan_sync()' 'hci_update_passive_scan_sync()' 'hci_discovery_filter_clear()' kfree(uuids); <-------------------------preempted--------------------------------> 'start_service_discovery()' 'hci_discovery_filter_clear()' kfree(uuids); // DOUBLE FREE <-------------------------preempted-----...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= ad383c2c65a5baf16e334cd40a013cc302176891 < 86f3dcd1f331cfd4fd7ec88906955134ec51afbe, >= ad383c2c65a5baf16e334cd40a013cc302176891 < 7ce9bb0b95fc280e9212b8922590c492ca1d9c39, >= ad383c2c65a5baf16e334cd40a013cc302176891 < 16852eccbdfaf41a666705e3f8be55cf2864c5ca, >= ad383c2c65a5baf16e334cd40a013cc302176891 < a351ff6b8ecca4229afaa0d98042bead8de64799, >= ad383c2c65a5baf16e334cd40a013cc302176891 < f8069f34c4c976786ded97498012225af87435d7, >= ad383c2c65a5baf16e334cd40a013cc302176891 < 2935e556850e9c94d7a00adf14d3cd7fe406ac03, >= 5.17, >= 5.17 < 6.6.117, >= 6.7 < 6.12.42, >= 6.13 < 6.15.10, >= 6.16 < 6.16.1
Fixed versions
6.6.117, 6.12.42, 6.15.10, 6.16.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-415