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ReviewHigh

CVE-2026-74540

Linux

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.15
PRIORITY ASSESSMENT

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: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a...

Affected product and versions

Product
Linux
Affected versions
>= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 15d6c2367217a6a20b1abae9f38ded716bf620f1, >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 1818180fe12d6cec7a437bc59cde8efdf6b10250, >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 8325eafb38c3dee5af329266393763693d17381b, >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < fd4c1e301bdec60a40728ea37de531cbccda501a, >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 522b730c62c53a1981604fd73524697fd347830d, >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136, >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < 09f447accc2570751e7d17f0dc0788b40d3edade, >= f1496dee9cbde2a62821f4441dadb0d3360f60c3 < c4740e7f23ff9a8210198d8b4703259e21b9f69d, >= 3.14
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