CVE-2022-49393

Kernel crash via invalid FastRPC list iterator

Published Feb 26, 2025 · Updated Aug 5, 2026

Denial of service in the Linux kernel FastRPC driver 5.18 through 5.18.2 allows local users to crash the kernel via a device ioctl. fastrpc_req_mem_unmap_impl uses the list_for_each_entry iterator as the result pointer, so a missing map leaves a non-NULL invalid pointer that is dereferenced. A local user able to open a FastRPC device and issue a MEM_UNMAP request with a nonmatching mapping can trigger the fault and interrupt the host.

CVSS severity7.8
High
EPSS probability0.23%
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 kernel FastRPC driver 5.18 through 5.18.2 allows local users to crash the kernel via a device ioctl. fastrpc_req_mem_unmap_impl uses the list_for_each_entry iterator as the result pointer, so a missing map leaves a non-NULL invalid pointer that is dereferenced. A local user able to open a FastRPC device and issue a MEM_UNMAP request with a nonmatching mapping can trigger the fault and interrupt the host.

The record

CVE
CVE-2022-49393
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-670, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.18
  2. Affected versionversion=5c1b97c7d7b736e6439af4f43a65837bc72f56c1 <2d12905aad462383f4e7a5fdb024d2b7ae2d10cf
  3. Affected versionversion=5c1b97c7d7b736e6439af4f43a65837bc72f56c1 <c5c07c5958cf0c9af6e76813e6de15d42ee49822

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=5c1b97c7d7b736e6439af4f43a65837bc72f56c1 <2d12905aad462383f4e7a5fdb024d2b7ae2d10cf; version=5c1b97c7d7b736e6439af4f43a65837bc72f56c1 <c5c07c5958cf0c9af6e76813e6de15d42ee49822

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS: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.

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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-670Always-Incorrect Control Flow Implementation
T1499.004Application 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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