---
id: CVE-2026-43239
title: 'smb: client: prevent races in ->query_interfaces()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  smb: client: prevent races in ->query_interfaces()

  It was possible for two query interface works to be concurrently trying
  to update the interfaces.

  Prevent this by c…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-821
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <
    93e8e3ee165ae4609a1222b516b573837103d2c3
  - >-
    Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <
    ab6564f416a6eaf1199200b6100952407b438f7d
  - >-
    Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <
    6287eefaf21ec805d42f941bd368018cf397a7f5
  - >-
    Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <
    76cc4faba0343c6db945b8dc75425b33d633e1b8
  - >-
    Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <
    c3c06e42e1527716c54f3ad2ced6a034b5f3a489
  - Linux 5.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T15:16:00.528244Z'
published: '2026-05-06'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T19:16:25.161Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43239'
references:
  - url: 'https://git.kernel.org/stable/c/93e8e3ee165ae4609a1222b516b573837103d2c3'
  - url: 'https://git.kernel.org/stable/c/ab6564f416a6eaf1199200b6100952407b438f7d'
  - url: 'https://git.kernel.org/stable/c/6287eefaf21ec805d42f941bd368018cf397a7f5'
  - url: 'https://git.kernel.org/stable/c/76cc4faba0343c6db945b8dc75425b33d633e1b8'
  - url: 'https://git.kernel.org/stable/c/c3c06e42e1527716c54f3ad2ced6a034b5f3a489'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43239.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-43239'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467195'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-43239'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-43239'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026050659-CVE-2026-43239-f862@gregkh/T
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00273
epssPercentile: 0.19596
scores:
  cna: 8.8
  vendor: 6.5
ingestedAt: '2026-10-16T17:24:46.689Z'
---

## Overview

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

smb: client: prevent races in ->query_interfaces()

It was possible for two query interface works to be concurrently trying
to update the interfaces.

Prevent this by checking and updating iface_last_update under
iface_lock.

## Affected

- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 93e8e3ee165ae4609a1222b516b573837103d2c3`
- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < ab6564f416a6eaf1199200b6100952407b438f7d`
- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 6287eefaf21ec805d42f941bd368018cf397a7f5`
- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < 76cc4faba0343c6db945b8dc75425b33d633e1b8`
- `Linux >= aa45dadd34e44fcd6a9df4b395bee5b5633b4cec < c3c06e42e1527716c54f3ad2ced6a034b5f3a489`
- `Linux 5.19`

## 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 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43239.json)