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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2022-49554 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8 kernel.org Patch 
https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b kernel.org Patch 
https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0 kernel.org Patch 
https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7 kernel.org Patch 
https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966 kernel.org Patch 
https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f kernel.org Patch 
https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758 kernel.org Patch 
https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2022-49554
NVD Published Date:
02/26/2025
NVD Last Modified:
10/22/2025
Source:
kernel.org