---
id: CVE-2026-98107
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect

  l2cap_chan_connect() tries to ensure there are no more than
  L2CAP_ECRED_CONN_SCID_MAX pending ECRED ch…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect

  l2cap_chan_connect() tries to ensure there are no more than
  L2CAP_ECRED_CONN_SCID_MAX pending ECRED ch…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= da49b602f7f75ccc91386e1274b3ef71676cd092 <
    ce0927eb3ee2939fab5ce3f9334bfd2fafb38481
  - >-
    Linux >= da49b602f7f75ccc91386e1274b3ef71676cd092 <
    6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65
  - >-
    Linux >= da49b602f7f75ccc91386e1274b3ef71676cd092 <
    df8c3af6132640da4788e96a02d653e642059803
  - >-
    Linux >= da49b602f7f75ccc91386e1274b3ef71676cd092 <
    56c2b5831d39dc84aad2573dc3e197af1a872a05
  - Linux 5.7
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:41.743'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98107'
references:
  - url: 'https://git.kernel.org/stable/c/56c2b5831d39dc84aad2573dc3e197af1a872a05'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6da5c0331fc3ef0c7b8df8269523fc3b2cce1e65'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ce0927eb3ee2939fab5ce3f9334bfd2fafb38481'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/df8c3af6132640da4788e96a02d653e642059803'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-25T11:06:38.825Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: fix out-of-bounds write in l2cap_ecred_connect

l2cap_chan_connect() tries to ensure there are no more than
L2CAP_ECRED_CONN_SCID_MAX pending ECRED channels, so they fit in the
same L2CAP_ECRED_CONN_REQ that l2cap_ecred_connect() constructs.

However, the check only counts deferred channels.  If 6 L2CAP sockets
are connected at the same time in order DDDDND (D=deferred,
N=non-deferred), the last can bump the total to max+1.  It results to
one __le16 written out of bounds of the scid array, and an invalid
ECRED_CONN_REQ being sent.

Fix by leaving room for the non-deferred pending ECRED channels in the
counting in l2cap_chan_connect(), so the limit can't be exceeded.

Move counting under same critical section where the channel is added.
Although race conditions involving this appear unreachable, it's easier
to see.

Also add WARN_ON_ONCE check in l2cap_ecred_defer_connect() to make this
less brittle.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.