CVE-2023-3317

System crash via freed firmware feature pointer

Published Jun 23, 2023 · Updated Mar 11, 2025

Use-after-free in the Linux Kernel MT7921 Wi-Fi driver before 6.3-rc6 allows local users to crash the system during firmware feature queries. mt7921_check_offload_capability retains a pointer into the loaded firmware buffer, releases that buffer, and then reads features->data through the stale pointer. The path runs when the MT7921E PCIe driver queries device firmware; a local user can cause a system crash, and the CNA also reports kernel-memory disclosure.

CVSS severity7.1
High
EPSS probability0.24%
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 MT7921 Wi-Fi driver before 6.3-rc6 allows local users to crash the system during firmware feature queries. mt7921_check_offload_capability retains a pointer into the loaded firmware buffer, releases that buffer, and then reads features->data through the stale pointer. The path runs when the MT7921E PCIe driver queries device firmware; a local user can cause a system crash, and the CNA also reports kernel-memory disclosure.

The record

CVE
CVE-2023-3317
Published
Jun 23, 2023
Updated
Mar 11, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 11, 2025Record 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=KErnel version prior to 6.3-rc6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=KErnel version prior to 6.3-rc6

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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