CVE-2022-49554
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2022
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
zsmalloc: fix races between asynchronous zspage free and page migration
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | 3674d8a8dadd03a447dd21069d4dacfc3399b63b | Unavailable | None listed |
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | 645996efc2ae391246d595832aaa6f9d3cc338c7 | Unavailable | None listed |
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | fc658c083904427abbf8f18280d517ee2668677c | Unavailable | None listed |
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | fae05b2314b147a78fbed1dc4c645d9a66313758 | Unavailable | None listed |
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | 3ec459c8810e658401be428d3168eacfc380bdd0 | Unavailable | None listed |
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | 8ba7b7c1dad1f6503c541778f31b33f7f62eb966 | Unavailable | None listed |
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | c5402fb5f71f1a725f1e55d9c6799c0c7bec308f | Unavailable | None listed |
| 77ff465799c60294e248000cd22ae8171da3304c | affected | git | 2505a981114dcb715f8977b8433f7540854851d8 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4.14 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 4.14 | Unavailable | None listed |
| 4.14.282 | unaffected | semver | Unavailable | 4.14.* | None listed |
| 4.19.246 | unaffected | semver | Unavailable | 4.19.* | None listed |
| 5.4.197 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.120 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.45 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 5.17.13 | unaffected | semver | Unavailable | 5.17.* | None listed |
| 5.18.2 | unaffected | semver | Unavailable | 5.18.* | None listed |
| 5.19 | unaffected | original_commit_for_fix | Unavailable | * | None listed |