---
id: CVE-2026-97408
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: L2CAP: validate connectionless PSM length

  Connectionless L2CAP frames carry a two-byte PSM at the start of the
  payload
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: L2CAP: validate connectionless PSM length

  Connectionless L2CAP frames carry a two-byte PSM at the start of the
  payload.  l2cap_recv_frame() currently reads …
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    8104cd9859b6de0826cffa68adf2c1461185823b
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    22fc1ce4e37c81d4e7aac01566ebdc232214540d
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    72e26293a231f63a856340d3a1f0f5fc29bf87e5
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    3502ede8aed3c3ee1786d952a11054ac737d1a38
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    ae69dca122f6d6046a68cf40153e6e827c77ff5c
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    a40a5f922546b3bd7c094d882b29177db4f2abe0
  - Linux 2.6.12
published: '2026-09-24'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:52.943'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97408'
references:
  - url: 'https://git.kernel.org/stable/c/22fc1ce4e37c81d4e7aac01566ebdc232214540d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3502ede8aed3c3ee1786d952a11054ac737d1a38'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/72e26293a231f63a856340d3a1f0f5fc29bf87e5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8104cd9859b6de0826cffa68adf2c1461185823b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9448e6f693fcf1f0ac4ee648a9b2cc83bfe4a982'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a40a5f922546b3bd7c094d882b29177db4f2abe0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ae69dca122f6d6046a68cf40153e6e827c77ff5c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97408.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97408'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540553'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97408'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97408'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97408.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00173
epssPercentile: 0.06643
ingestedAt: '2026-09-24T16:47:15.888Z'
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-125
---

## Overview

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

Bluetooth: L2CAP: validate connectionless PSM length

Connectionless L2CAP frames carry a two-byte PSM at the start of the
payload.  l2cap_recv_frame() currently reads that PSM unconditionally
after validating only the outer L2CAP length.

A malformed connectionless frame with a zero- or one-byte payload can
therefore make the parser read beyond the advertised skb payload and use
tailroom bytes as part of the PSM.  A VHCI-backed QEMU reproducer
injected a one-byte connectionless payload and reached the unchecked
read.

Reject connectionless frames that cannot contain the PSM before reading
or pulling it.  This preserves all valid connectionless frames while
dropping only structurally incomplete packets.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97408.json)