CVE-2022-3636

Local code execution via MediaTek Ethernet use-after-free

Published Oct 21, 2022 · Updated Jul 28, 2026

Use-after-free in Linux Kernel 33fc42de33278b2b3ec6f3390512987bc29a62b7 allows local users to crash systems via MediaTek Ethernet handling. The __mtk_ppe_check_skb function in drivers/net/ethernet/mediatek/mtk_ppe.c accesses packet state after it has been freed, creating a use-after-free condition. Reaching the code requires local low-privilege access; Ubuntu reports system crash or possible arbitrary code execution, while Debian states no released upstream kernel was affected.

CVSS severity7.8
High
EPSS probability0.34%
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 Linux Kernel 33fc42de33278b2b3ec6f3390512987bc29a62b7 allows local users to crash systems via MediaTek Ethernet handling. The __mtk_ppe_check_skb function in drivers/net/ethernet/mediatek/mtk_ppe.c accesses packet state after it has been freed, creating a use-after-free condition. Reaching the code requires local low-privilege access; Ubuntu reports system crash or possible arbitrary code execution, while Debian states no released upstream kernel was affected.

The record

CVE
CVE-2022-3636
Published
Oct 21, 2022
Updated
Jul 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, CWE-119, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=33fc42de33278b2b3ec6f3390512987bc29a62b7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=33fc42de33278b2b3ec6f3390512987bc29a62b7

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1068Exploitation for Defense Evasion

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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