CVE-2022-49554

MediumCVSS 4.7/10Last modified Oct 15, 2026

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

CVSS 3.1 4.7/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-362

Affected software

VendorProductVersions
LinuxLinux>= 77ff465799c60294e248000cd22ae8171da3304c, < 3674d8a8dadd03a447dd21069d4dacfc3399b63b; >= 77ff465799c60294e248000cd22ae8171da3304c, < 645996efc2ae391246d595832aaa6f9d3cc338c7; >= 77ff465799c60294e248000cd22ae8171da3304c, < fc658c083904427abbf8f18280d517ee2668677c; >= 77ff465799c60294e248000cd22ae8171da3304c, < fae05b2314b147a78fbed1dc4c645d9a66313758; >= 77ff465799c60294e248000cd22ae8171da3304c, < 3ec459c8810e658401be428d3168eacfc380bdd0; >= 77ff465799c60294e248000cd22ae8171da3304c, < 8ba7b7c1dad1f6503c541778f31b33f7f62eb966; >= 77ff465799c60294e248000cd22ae8171da3304c, < c5402fb5f71f1a725f1e55d9c6799c0c7bec308f; >= 77ff465799c60294e248000cd22ae8171da3304c, < 2505a981114dcb715f8977b8433f7540854851d8
LinuxLinux4.14

References

Timeline

Published
Feb 26, 2025
Last modified
Oct 15, 2026
NVD status
Modified

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CVE-2022-49554: Medium severity, CVSS 4.7 | Vulnix