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Review reviewHigh

CVE-2026-64408

Linux

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: pin L2CAP connection during netdev registration bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device. Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: pin L2CAP connection during netdev registration bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device. Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.

Affected product and versions

Product
Linux
Affected versions
>= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < 390b5db3ff8745187f094c4e915663b7b1f98944, >= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < 46a88784c4c9b96954dd86f747ce93f65efa1302, >= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < 551ae773ec64045b4e72099132654887e0270bcc, >= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < ae215c5b6422d8eda443b861b124bd1be6969c31, >= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < df22adc7eafc22e651561813c11dc51a796b12ee, >= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < a6b22dbd80926556290ad2243be25218d6956a19, >= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < 563a8573047182f550b1e1e030615755cd8c41da, >= 65f53e9802dbfae0e5758a91793c3f5f8bece49b < bb067a99a0356196c0b89a95721985485ebce5a5, >= 3.13
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available