---
id: CVE-2026-31408
title: >-
  Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing
  sock_hold
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing
  sock_hold


  sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately

  releases the lock…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    d57384e27d1ebf0047e3f00a6e1181b8be9857a2
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    b0a7da0e3f7442545f071499beb36374714bb9de
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    45aaca995e4a7a05b272a58e7ab2fff4f611b8f1
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    108b81514d8f2535eb16651495cefb2250528db3
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    e76e8f0581ef555eacc11dbb095e602fb30a5361
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    598dbba9919c5e36c54fe1709b557d64120cb94b
  - Linux 2.6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:09:03.338755Z'
published: '2026-04-06'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:09:59.172Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-31408'
references:
  - url: 'https://git.kernel.org/stable/c/37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d'
  - url: 'https://git.kernel.org/stable/c/d57384e27d1ebf0047e3f00a6e1181b8be9857a2'
  - url: 'https://git.kernel.org/stable/c/b0a7da0e3f7442545f071499beb36374714bb9de'
  - url: 'https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1'
  - url: 'https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3'
  - url: 'https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e'
  - url: 'https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361'
  - url: 'https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b'
tags:
  - cve.org
epss: 0.004
epssPercentile: 0.32766
ingestedAt: '2026-10-16T17:24:46.650Z'
---

## Overview

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

Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold

sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately
releases the lock without holding a reference to the socket. A concurrent
close() can free the socket between the lock release and the subsequent
sk->sk_state access, resulting in a use-after-free.

Other functions in the same file (sco_sock_timeout(), sco_conn_del())
correctly use sco_sock_hold() to safely hold a reference under the lock.

Fix by using sco_sock_hold() to take a reference before releasing the
lock, and adding sock_put() on all exit paths.

## Affected

- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d57384e27d1ebf0047e3f00a6e1181b8be9857a2`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b0a7da0e3f7442545f071499beb36374714bb9de`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 45aaca995e4a7a05b272a58e7ab2fff4f611b8f1`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 108b81514d8f2535eb16651495cefb2250528db3`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e76e8f0581ef555eacc11dbb095e602fb30a5361`
- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 598dbba9919c5e36c54fe1709b557d64120cb94b`
- `Linux 2.6.12`

## Remediation

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