CVE-2022-48988

Local privilege escalation via cgroup file race

Published Oct 21, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel memcg allows local users to escalate privileges or crash the host through cgroup v1 event control. memcg_write_event_control() accepts an arbitrary control file descriptor without verifying a regular cgroupfs file, so concurrent rename or removal races d_name and parent accesses against freed dentries. A low-privileged local user needs write access to cgroup.event_control in a reachable cgroup v1 memory hierarchy; successful exploitation compromises the host kernel or triggers an oops or panic.

CVSS severity7.0
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 Linux kernel memcg allows local users to escalate privileges or crash the host through cgroup v1 event control. memcg_write_event_control() accepts an arbitrary control file descriptor without verifying a regular cgroupfs file, so concurrent rename or removal races d_name and parent accesses against freed dentries. A low-privileged local user needs write access to cgroup.event_control in a reachable cgroup v1 memory hierarchy; successful exploitation compromises the host kernel or triggers an oops or panic.

The record

CVE
CVE-2022-48988
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 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

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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=3.14
  2. Affected versionversion=347c4a8747104a945ecced358944e42879176ca5 <0ed074317b835caa6c03bcfa8f133365324673dc
  3. Affected versionversion=347c4a8747104a945ecced358944e42879176ca5 <35963b31821920908e397146502066f6b032c917
  4. Affected versionversion=347c4a8747104a945ecced358944e42879176ca5 <4a7ba45b1a435e7097ca0f79a847d0949d0eb088
  5. Affected versionversion=347c4a8747104a945ecced358944e42879176ca5 <aad8bbd17a1d586005feb9226c2e9cfce1432e13
  6. Affected versionversion=347c4a8747104a945ecced358944e42879176ca5 <b77600e26fd48727a95ffd50ba1e937efb548125
  7. Affected versionversion=347c4a8747104a945ecced358944e42879176ca5 <e1ae97624ecf400ea56c238bff23e5cd139df0b8
  8. Affected versionversion=347c4a8747104a945ecced358944e42879176ca5 <f1f7f36cf682fa59db15e2089039a2eeb58ff2ad

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.14; version=347c4a8747104a945ecced358944e42879176ca5 <0ed074317b835caa6c03bcfa8f133365324673dc; version=347c4a8747104a945ecced358944e42879176ca5 <35963b31821920908e397146502066f6b032c917; version=347c4a8747104a945ecced358944e42879176ca5 <4a7ba45b1a435e7097ca0f79a847d0949d0eb088; version=347c4a8747104a945ecced358944e42879176ca5 <aad8bbd17a1d586005feb9226c2e9cfce1432e13; version=347c4a8747104a945ecced358944e42879176ca5 <b77600e26fd48727a95ffd50ba1e937efb548125; version=347c4a8747104a945ecced358944e42879176ca5 <e1ae97624ecf400ea56c238bff23e5cd139df0b8; version=347c4a8747104a945ecced358944e42879176ca5 <f1f7f36cf682fa59db15e2089039a2eeb58ff2ad

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0UbuntuCVSS:3.1/AV:L/AC:H/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
PrivilegesUnavailable
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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