---
id: CVE-2026-53097
title: 'wifi: mt76: mt7996: fix use-after-free bugs in mt7996_mac_dump_work()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: mt7996: fix use-after-free bugs in mt7996_mac_dump_work()

  When the mt7996 pci chip is detaching, the mt7996_crash_data is
  released in mt7996_coredump_unreg…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 <
    533b1a9fa0128c75e40dd2d2c38a32b4e660741f
  - >-
    Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 <
    180182a3f23ff79430a32ca2c4c1885368ceab48
  - >-
    Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 <
    aa4a31cd89f4fde5043ac613fe0e27014a60a60b
  - >-
    Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 <
    188e10f9ea3109d23c6b7643aa6ec2f5cb0faa6d
  - >-
    Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 <
    c8f62f73bbced3a79894655bdb0b625462d956fc
  - Linux 6.4
published: '2026-06-24'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:41:57.624Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53097'
references:
  - url: 'https://git.kernel.org/stable/c/533b1a9fa0128c75e40dd2d2c38a32b4e660741f'
  - url: 'https://git.kernel.org/stable/c/180182a3f23ff79430a32ca2c4c1885368ceab48'
  - url: 'https://git.kernel.org/stable/c/aa4a31cd89f4fde5043ac613fe0e27014a60a60b'
  - url: 'https://git.kernel.org/stable/c/188e10f9ea3109d23c6b7643aa6ec2f5cb0faa6d'
  - url: 'https://git.kernel.org/stable/c/c8f62f73bbced3a79894655bdb0b625462d956fc'
tags:
  - cve.org
epss: 0.0017
epssPercentile: 0.06012
ingestedAt: '2026-10-21T12:48:53.624Z'
---

## Overview

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

wifi: mt76: mt7996: fix use-after-free bugs in mt7996_mac_dump_work()

When the mt7996 pci chip is detaching, the mt7996_crash_data is
released in mt7996_coredump_unregister(). However, the work item
dump_work may still be running or pending, leading to UAF bugs
when the already freed crash_data is dereferenced again in
mt7996_mac_dump_work().

The race condition can occur as follows:

CPU 0 (removal path)               | CPU 1 (workqueue)
mt7996_pci_remove()                | mt7996_sys_recovery_set()
 mt7996_unregister_device()        |  mt7996_reset()
  mt7996_coredump_unregister()     |   queue_work()
   vfree(dev->coredump.crash_data) | mt7996_mac_dump_work()
                                   |  crash_data-> // UAF

Fix this by ensuring dump_work is properly canceled before
the crash_data is deallocated. Add cancel_work_sync() in
mt7996_unregister_device() to synchronize with any pending
or executing dump work.

## Affected

- `Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 < 533b1a9fa0128c75e40dd2d2c38a32b4e660741f`
- `Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 < 180182a3f23ff79430a32ca2c4c1885368ceab48`
- `Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 < aa4a31cd89f4fde5043ac613fe0e27014a60a60b`
- `Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 < 188e10f9ea3109d23c6b7643aa6ec2f5cb0faa6d`
- `Linux >= 878161d5d4a469a6ef7f3fb4fe9f676bc508ee99 < c8f62f73bbced3a79894655bdb0b625462d956fc`
- `Linux 6.4`

## Remediation

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