CVE-2022-49647

Kernel compromise via cgroup migration use-after-free

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel cgroup migration allows local users to crash or compromise the kernel through crafted cgroupfs writes. The cgroup migration code reuses mg_preload_node for source and destination lists, so an identity move can drop the destination css_set reference and free it during migration. Write access to a delegated cgroup subtree and a multithreaded migration mixing identity and cross-cgroup moves are required.

CVSS severity7.8
High
EPSS probability0.29%
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 cgroup migration allows local users to crash or compromise the kernel through crafted cgroupfs writes. The cgroup migration code reuses mg_preload_node for source and destination lists, so an identity move can drop the destination css_set reference and free it during migration. Write access to a delegated cgroup subtree and a multithreaded migration mixing identity and cross-cgroup moves are required.

The record

CVE
CVE-2022-49647
Published
Feb 26, 2025
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. 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=3.16
  2. Affected versionversion=f817de98513d060023be4fa1d061b29a6515273e <05f7658210d1d331e8dd4cb6e7bbbe3df5f5ac27
  3. Affected versionversion=f817de98513d060023be4fa1d061b29a6515273e <07fd5b6cdf3cc30bfde8fe0f644771688be04447
  4. Affected versionversion=f817de98513d060023be4fa1d061b29a6515273e <0e41774b564befa6d271e8d5086bf870d617a4e6
  5. Affected versionversion=f817de98513d060023be4fa1d061b29a6515273e <54aee4e5ce8c21555286a6333e46c1713880cf93
  6. Affected versionversion=f817de98513d060023be4fa1d061b29a6515273e <7657e3958535d101a24ab4400f9b8062b9107cc4
  7. Affected versionversion=f817de98513d060023be4fa1d061b29a6515273e <ad44e05f3e016bdcb1ad25af35ade5b5f41ccd68
  8. Affected versionversion=f817de98513d060023be4fa1d061b29a6515273e <cec2bbdcc14fbaa6b95ee15a7c423b05d97038be

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.16; version=f817de98513d060023be4fa1d061b29a6515273e <05f7658210d1d331e8dd4cb6e7bbbe3df5f5ac27; version=f817de98513d060023be4fa1d061b29a6515273e <07fd5b6cdf3cc30bfde8fe0f644771688be04447; version=f817de98513d060023be4fa1d061b29a6515273e <0e41774b564befa6d271e8d5086bf870d617a4e6; version=f817de98513d060023be4fa1d061b29a6515273e <54aee4e5ce8c21555286a6333e46c1713880cf93; version=f817de98513d060023be4fa1d061b29a6515273e <7657e3958535d101a24ab4400f9b8062b9107cc4; version=f817de98513d060023be4fa1d061b29a6515273e <ad44e05f3e016bdcb1ad25af35ade5b5f41ccd68; version=f817de98513d060023be4fa1d061b29a6515273e <cec2bbdcc14fbaa6b95ee15a7c423b05d97038be

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8CISA-ADPCVSS: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

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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

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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