CVE-2022-48873

Local privilege escalation via premature fastrpc map removal

Published Aug 21, 2024 · Updated Aug 5, 2026

Use-after-free in the fastrpc driver in affected Linux kernel branches allows local users to corrupt kernel memory through ioctl and close operations. Error handling in fastrpc_init_create_process and fastrpc_device_release removes a live map before its reference count reaches zero, leaving later references to freed memory. Access to a fastrpc device is required; successful exploitation can crash the kernel or grant elevated privileges.

CVSS severity7.8
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 fastrpc driver in affected Linux kernel branches allows local users to corrupt kernel memory through ioctl and close operations. Error handling in fastrpc_init_create_process and fastrpc_device_release removes a live map before its reference count reaches zero, leaving later references to freed memory. Access to a fastrpc device is required; successful exploitation can crash the kernel or grant elevated privileges.

The record

CVE
CVE-2022-48873
Published
Aug 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2024CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.1.6 <5.2
  2. Affected versionversion=5.2
  3. Affected versionversion=aaf5aa44934ad069cac805923c49f6968b9a0d49
  4. Affected versionversion=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <193cd853145b63e670bd73740250983af1475330
  5. Affected versionversion=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <1b7b7bb400dd13dcb03fc6e591bb7ca4664bbec8
  6. Affected versionversion=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <35ddd482345c43d9eec1f3406c0f20a95ed4054b
  7. Affected versionversion=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <4b5c44e924a571d0ad07054de549624fbc04e4d7
  8. Affected versionversion=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <5bb96c8f9268e2fdb0e5321cbc358ee5941efc15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1.6 <5.2; version=5.2; version=aaf5aa44934ad069cac805923c49f6968b9a0d49; version=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <193cd853145b63e670bd73740250983af1475330; version=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <1b7b7bb400dd13dcb03fc6e591bb7ca4664bbec8; version=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <35ddd482345c43d9eec1f3406c0f20a95ed4054b; version=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <4b5c44e924a571d0ad07054de549624fbc04e4d7; version=b49f6d83e290f17e20f4e5cf31288d3bb4955ea6 <5bb96c8f9268e2fdb0e5321cbc358ee5941efc15

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS: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
T1068Exploitation for Privilege Escalation

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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