CVE-2022-49112

Kernel crash via undersized linear receive buffer

Published Feb 26, 2025 · Updated Aug 12, 2026

Denial of service in the Linux mt76 SDIO driver in 5.16 allows local users to crash the kernel through monitor-mode CTS frame processing. The SDIO receive path keeps only the RX descriptor in a 128-byte linear skb head, then skb_pull requests the descriptor plus six padding bytes from a fragmented buffer and triggers __skb_pull's length assertion. Access to a system with mt7921s SDIO hardware and monitor mode enabled is required; the resulting kernel BUG interrupts the host.

CVSS severity5.5
Medium
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

Denial of service in the Linux mt76 SDIO driver in 5.16 allows local users to crash the kernel through monitor-mode CTS frame processing. The SDIO receive path keeps only the RX descriptor in a 128-byte linear skb head, then skb_pull requests the descriptor plus six padding bytes from a fragmented buffer and triggers __skb_pull's length assertion. Access to a system with mt7921s SDIO hardware and monitor mode enabled is required; the resulting kernel BUG interrupts the host.

The record

CVE
CVE-2022-49112
Published
Feb 26, 2025
Updated
Aug 12, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=48fab5bbef4092d925ab3214773ad12e68807223 <123bc712b1de0805f9d683687e17b1ec2aba0b68
  2. Affected versionversion=48fab5bbef4092d925ab3214773ad12e68807223 <95e2af01669c7a3cb7a933cefa06361f9db15059
  3. Affected versionversion=48fab5bbef4092d925ab3214773ad12e68807223 <c37b4cab3d97ef64b206fca4d9daabd9aff7356e
  4. Affected versionversion=5.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=48fab5bbef4092d925ab3214773ad12e68807223 <123bc712b1de0805f9d683687e17b1ec2aba0b68; version=48fab5bbef4092d925ab3214773ad12e68807223 <95e2af01669c7a3cb7a933cefa06361f9db15059; version=48fab5bbef4092d925ab3214773ad12e68807223 <c37b4cab3d97ef64b206fca4d9daabd9aff7356e; version=5.16

Published CVSS scores

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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