CVE-2022-49554

Kernel crash via unsynchronized zspage page migration

Published Feb 26, 2025 · Updated Aug 5, 2026

Race condition in Linux kernel zsmalloc allows local users to crash the kernel through concurrent page migration activity. The asynchronous zspage-free worker's lock_zspage() traversal does not synchronize with migration, so it can follow torn or cleared list pointers or dereference page_private() after a page leaves the zspage. Local low-privileged access and a migration race are required; successful exploitation can leave pages unlocked or trigger unsafe kernel pointer dereferences, resulting in a system crash.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel zsmalloc allows local users to crash the kernel through concurrent page migration activity. The asynchronous zspage-free worker's lock_zspage() traversal does not synchronize with migration, so it can follow torn or cleared list pointers or dereference page_private() after a page leaves the zspage. Local low-privileged access and a migration race are required; successful exploitation can leave pages unlocked or trigger unsafe kernel pointer dereferences, resulting in a system crash.

The record

CVE
CVE-2022-49554
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
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=4.14
  2. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <2505a981114dcb715f8977b8433f7540854851d8
  3. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <3674d8a8dadd03a447dd21069d4dacfc3399b63b
  4. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <3ec459c8810e658401be428d3168eacfc380bdd0
  5. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <645996efc2ae391246d595832aaa6f9d3cc338c7
  6. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <8ba7b7c1dad1f6503c541778f31b33f7f62eb966
  7. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <c5402fb5f71f1a725f1e55d9c6799c0c7bec308f
  8. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <fae05b2314b147a78fbed1dc4c645d9a66313758
  9. Affected versionversion=77ff465799c60294e248000cd22ae8171da3304c <fc658c083904427abbf8f18280d517ee2668677c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=77ff465799c60294e248000cd22ae8171da3304c <2505a981114dcb715f8977b8433f7540854851d8; version=77ff465799c60294e248000cd22ae8171da3304c <3674d8a8dadd03a447dd21069d4dacfc3399b63b; version=77ff465799c60294e248000cd22ae8171da3304c <3ec459c8810e658401be428d3168eacfc380bdd0; version=77ff465799c60294e248000cd22ae8171da3304c <645996efc2ae391246d595832aaa6f9d3cc338c7; version=77ff465799c60294e248000cd22ae8171da3304c <8ba7b7c1dad1f6503c541778f31b33f7f62eb966; version=77ff465799c60294e248000cd22ae8171da3304c <c5402fb5f71f1a725f1e55d9c6799c0c7bec308f; version=77ff465799c60294e248000cd22ae8171da3304c <fae05b2314b147a78fbed1dc4c645d9a66313758; version=77ff465799c60294e248000cd22ae8171da3304c <fc658c083904427abbf8f18280d517ee2668677c

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499Endpoint Denial of Service

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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