CVE-2022-49990

Kernel memory corruption via fork failure double free

Published Jun 18, 2025 · Updated Aug 5, 2026

A double free in the s390 task-copy path in Linux allows local users to corrupt kernel memory by forcing fork failure. arch_dup_task_struct copies guarded-storage and runtime-instrumentation pointers into the child task, but a failure before copy_thread clears them leaves free_task to release the parent-owned objects again. Exploitation requires local low-privileged access and s390 guarded-storage or runtime-instrumentation facilities; the resulting use-after-free can panic the kernel or enable privilege escalation.

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

A double free in the s390 task-copy path in Linux allows local users to corrupt kernel memory by forcing fork failure. arch_dup_task_struct copies guarded-storage and runtime-instrumentation pointers into the child task, but a failure before copy_thread clears them leaves free_task to release the parent-owned objects again. Exploitation requires local low-privileged access and s390 guarded-storage or runtime-instrumentation facilities; the resulting use-after-free can panic the kernel or enable privilege escalation.

The record

CVE
CVE-2022-49990
Published
Jun 18, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499.004, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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=232b47b3c88af1da737cd7760f247c4ed58168cf
  2. Affected versionversion=4.14.5 <4.15
  3. Affected versionversion=4.15
  4. Affected versionversion=4.4.105 <4.5
  5. Affected versionversion=4.9.68 <4.10
  6. Affected versionversion=8d9047f8b967ce6181fd824ae922978e1b055cc0 <13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9
  7. Affected versionversion=8d9047f8b967ce6181fd824ae922978e1b055cc0 <25a95303b9e513cd2978aacc385d06e6fec23d07
  8. Affected versionversion=8d9047f8b967ce6181fd824ae922978e1b055cc0 <297ae7e87a87a001dd3dfeac1cb26a42fd929708
  9. Affected versionversion=8d9047f8b967ce6181fd824ae922978e1b055cc0 <8195e065abf3df84eb0ad2987e76a40f21d1791c
  10. Affected versionversion=8d9047f8b967ce6181fd824ae922978e1b055cc0 <cacd522e6652fbc2dc0cc6ae11c4e30782fef14b
  11. Affected versionversion=8d9047f8b967ce6181fd824ae922978e1b055cc0 <fbdc482d43eda40a70de4b0155843d5472f6de62
  12. Affected versionversion=9e51ee1b76efc7b5e9404010793a39fde0e03cb7
  13. Affected versionversion=b8e212c599082896a180a18a0c9bd529526590be

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=232b47b3c88af1da737cd7760f247c4ed58168cf; version=4.14.5 <4.15; version=4.15; version=4.4.105 <4.5; version=4.9.68 <4.10; version=8d9047f8b967ce6181fd824ae922978e1b055cc0 <13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9; version=8d9047f8b967ce6181fd824ae922978e1b055cc0 <25a95303b9e513cd2978aacc385d06e6fec23d07; version=8d9047f8b967ce6181fd824ae922978e1b055cc0 <297ae7e87a87a001dd3dfeac1cb26a42fd929708; version=8d9047f8b967ce6181fd824ae922978e1b055cc0 <8195e065abf3df84eb0ad2987e76a40f21d1791c; version=8d9047f8b967ce6181fd824ae922978e1b055cc0 <cacd522e6652fbc2dc0cc6ae11c4e30782fef14b; version=8d9047f8b967ce6181fd824ae922978e1b055cc0 <fbdc482d43eda40a70de4b0155843d5472f6de62; version=9e51ee1b76efc7b5e9404010793a39fde0e03cb7; version=b8e212c599082896a180a18a0c9bd529526590be

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
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.3CanonicalCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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 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-415Double Free
T1499.004Endpoint Denial of Service: Application or System Exploitation
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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