CVE-2022-49554zsmalloc: fix races between asynchronous zspage free and page migration
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 77ff465799c60294e248000cd22ae8171da3304c before 3674d8a8dadd03a447dd21069d4dacfc3399b63b; from 77ff465799c60294e248000cd22ae8171da3304c before 645996efc2ae391246d595832aaa6f9d3cc338c7; from 77ff465799c60294e248000cd22ae8171da3304c before fc658c083904427abbf8f18280d517ee2668677c; from 77ff465799c60294e248000cd22ae8171da3304c before fae05b2314b147a78fbed1dc4c645d9a66313758; 77ff465799c60294e248000cd22ae8171da3304c builds before 3ec459c8810e658401be428d3168eacfc380bdd0; 77ff465799c60294e248000cd22ae8171da3304c builds before 8ba7b7c1dad1f6503c541778f31b33f7f62eb966; from 77ff465799c60294e248000cd22ae8171da3304c before c5402fb5f71f1a725f1e55d9c6799c0c7bec308f; from 77ff465799c60294e248000cd22ae8171da3304c before 2505a981114dcb715f8977b8433f7540854851d8 | CNA record |
linux linux_kernel linux:linux_kernel | from 4.14 before 4.14.282; from 4.15 before 4.19.246; from 4.20 before 5.4.197; from 5.5 before 5.10.120; from 5.11 before 5.15.45; from 5.16 before 5.17.13; from 5.18 before 5.18.2 | NVD |
References
- https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63bpatch
- https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7patch
- https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677cpatch
- https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758patch
- https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0patch
- https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966patch
- https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308fpatch
- https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.