CVE-2026-23461

HIGH EPSS 15.9%
Published Apr 3, 20262mo ago · Modified Jun 17, 20261w ago
8.8 CVSS 3.1
High
Find Similar
Published Apr 3, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user After commit ab4eedb790ca ("Bluetooth: L2CAP: Fix corrupted list in hci_chan_del"), l2cap_conn_del() uses conn->lock to protect access to conn->users. However, l2cap_register_user() and l2cap_unregister_user() don't use conn->lock, creating a race condition where these functions can access conn->users and conn->hchan concurrently with l2cap_conn_del(). This can lead to use-after-free and list corruption bugs, as reported by syzbot. Fix this by changing l2cap_register_user() and l2cap_unregister_user() to use conn->lock instead of hci_dev_lock(), ensuring consistent locking for the l2cap_conn structure.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
15.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 15

VendorProductVersionRange
linuxlinux_kernel*≥6.6.84  –  <6.6.130
linuxlinux_kernel*≥6.12.20  –  <6.12.78
linuxlinux_kernel*≥6.13.8  –  <6.14
linuxlinux_kernel*≥6.14.1  –  <6.18.20
linuxlinux_kernel*≥6.19  –  <6.19.10
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/11a87dd5df428a4b79a84d2790cac7f3c73f1f0d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/71030f3b3015a412133a805ff47970cdcf30c2b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/752a6c9596dd25efd6978a73ff21f3b592668f4a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/da3000cbe4851458a22be38bb18c0689c39fdd5f
    Patch