CVE-2022-49387

Service interruption via watchdog timer overflow

Published Feb 26, 2025 · Updated May 11, 2026

Integer overflow in the Linux kernel allows local users to interrupt service through the Renesas RZ/G2L watchdog driver. The rzg2l_wdt_get_cycle_usec function evaluates its timer multiplication as 32-bit arithmetic before assigning it to u64, allowing timer_cycle_us to wrap to zero. Triggering the flaw requires local low-privilege access to a system using this hardware-specific driver, and the published impact is limited to availability.

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

Integer overflow in the Linux kernel allows local users to interrupt service through the Renesas RZ/G2L watchdog driver. The rzg2l_wdt_get_cycle_usec function evaluates its timer multiplication as 32-bit arithmetic before assigning it to u64, allowing timer_cycle_us to wrap to zero. Triggering the flaw requires local low-privilege access to a system using this hardware-specific driver, and the published impact is limited to availability.

The record

CVE
CVE-2022-49387
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499.004
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=2cbc5cd0b55fa2310cc557c77b0665f5e00272de <b95a47667d34e76c2c9013f8e3b1e5039a5a0b76
  2. Affected versionversion=2cbc5cd0b55fa2310cc557c77b0665f5e00272de <e07b9fa0dc32b492de85528caaf9f0c605d8424f
  3. Affected versionversion=2cbc5cd0b55fa2310cc557c77b0665f5e00272de <ea2949df22a533cdf75e4583c00b1ce94cd5a83b
  4. Affected versionversion=5.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2cbc5cd0b55fa2310cc557c77b0665f5e00272de <b95a47667d34e76c2c9013f8e3b1e5039a5a0b76; version=2cbc5cd0b55fa2310cc557c77b0665f5e00272de <e07b9fa0dc32b492de85528caaf9f0c605d8424f; version=2cbc5cd0b55fa2310cc557c77b0665f5e00272de <ea2949df22a533cdf75e4583c00b1ce94cd5a83b; version=5.17

Published CVSS scores

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

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

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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