---
id: CVE-2026-72113
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  can: bcm: add missing device refcount for CAN filter removal

  sashiko-bot remarked a problem with a concurrent device unregistration
  in isotp.c which also is present in…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  can: bcm: add missing device refcount for CAN filter removal

  sashiko-bot remarked a problem with a concurrent device unregistration
  in isotp.c which also is present in…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:17:08.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72113'
references:
  - url: 'https://git.kernel.org/stable/c/04d23061bbf18d5d81022eb21e9d32e99d24468d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/84aa4807816e405c1bf87114fc63e06d244281ef'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b024c21c9066f6957b7d4a8f2037e4b000c5e041'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d59948293ea34b6337ce2b5febab8510de70048c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72113.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-72113'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2516506'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-72113'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72113'
  - url: 'https://kernelcve.org/list/?q=CVE-2026-72113'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026081527-CVE-2026-72113-b385@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00169
epssPercentile: 0.06196
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:41:41.918613Z'
scores:
  nvd: 7.8
  vendor: 4.7
  cna: 7.8
ingestedAt: '2026-10-16T19:46:24.432Z'
---

## Overview

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

can: bcm: add missing device refcount for CAN filter removal

sashiko-bot remarked a problem with a concurrent device unregistration
in isotp.c which also is present in the bcm.c code. A former fix for raw.c
commit c275a176e4b6 ("can: raw: add missing refcount for memory leak fix")
introduced a netdevice_tracker which solves the issue for bcm.c too.

bcm_release(), bcm_delete_rx_op() and bcm_notifier() relied on
dev_get_by_index(ifindex) to re-find the device for an rx_op before
unregistering its filter. If a concurrent NETDEV_UNREGISTER has already
unlisted the device from the ifindex table, that lookup fails and
can_rx_unregister() is silently skipped, leaving a stale CAN filter
pointing at the soon-to-be-freed bcm_op/socket.

Hold a netdev_hold()/netdev_put() tracked reference on op->rx_reg_dev
from the moment the rx filter is registered in bcm_rx_setup() until it
is unregistered in bcm_rx_unreg(), and use that reference directly in
bcm_release() and bcm_delete_rx_op() instead of re-looking the device
up by ifindex.

## 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 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72113.json)