CVE-2022-49476

Kernel crash via premature mt76 device free

Published Feb 26, 2025 · Updated May 11, 2026

Use-after-free in the Linux kernel mt7921e driver allows local users to crash the kernel when the PCI device is removed. mt7921_pci_remove frees the mt76 device before devm_free_irq finishes, allowing mt7921_irq_handler to dereference the released device during IRQ teardown. Reachability requires local low-privileged access and an active mt7921 PCI device; successful triggering interrupts the host by crashing the kernel.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel mt7921e driver allows local users to crash the kernel when the PCI device is removed. mt7921_pci_remove frees the mt76 device before devm_free_irq finishes, allowing mt7921_irq_handler to dereference the released device during IRQ teardown. Reachability requires local low-privileged access and an active mt7921 PCI device; successful triggering interrupts the host by crashing the kernel.

The record

CVE
CVE-2022-49476
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.12
  2. Affected versionversion=5c14a5f944b91371961548b1907802f74a4d2e5c <09693f5b636fb3f6dd56fd943226fc1bbc600b51
  3. Affected versionversion=5c14a5f944b91371961548b1907802f74a4d2e5c <677e669973bf5460705bc65033445ea9f6615999
  4. Affected versionversion=5c14a5f944b91371961548b1907802f74a4d2e5c <ad483ed9dd5193a54293269c852a29051813b7bd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.12; version=5c14a5f944b91371961548b1907802f74a4d2e5c <09693f5b636fb3f6dd56fd943226fc1bbc600b51; version=5c14a5f944b91371961548b1907802f74a4d2e5c <677e669973bf5460705bc65033445ea9f6615999; version=5c14a5f944b91371961548b1907802f74a4d2e5c <ad483ed9dd5193a54293269c852a29051813b7bd

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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