{"id":"CVE-2022-49554","revision":null,"records":[{"revision":"31e6527bddda4a9883f108f3d94128f2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2022-49554","aliases":[],"title":"zsmalloc: fix races between asynchronous zspage free and page migration","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nzsmalloc: fix races between asynchronous zspage free and page migration\n\nThe asynchronous zspage free worker tries to lock a zspage's entire page\nlist without defending against page migration. Since pages which haven't\nyet been locked can concurrently migrate off the zspage page list while\nlock_zspage() churns away, lock_zspage() can suffer from a few different\nlethal races.\n\nIt can lock a page which no longer belongs to the zspage and unsafely\ndereference page_private(), it can unsafely dereference a torn pointer to\nthe next page (since there's a data race), and it can observe a spurious\nNULL pointer to the next page and thus not lock all of the zspage's pages\n(since a single page migration will reconstruct the entire page list, and\ncreate_page_chain() unconditionally zeroes out each list pointer in the\nprocess).\n\nFix the races by using migrate_read_lock() in lock_zspage() to synchronize\nwith page migration.","state":0,"publishedAt":"2025-02-26T02:14:02.649+00:00","modifiedAt":"2026-10-15T21:21:07.734+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"mm/zsmalloc.c\"\n ],\n \"versions\": [\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"3674d8a8dadd03a447dd21069d4dacfc3399b63b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"645996efc2ae391246d595832aaa6f9d3cc338c7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"fc658c083904427abbf8f18280d517ee2668677c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"fae05b2314b147a78fbed1dc4c645d9a66313758\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"3ec459c8810e658401be428d3168eacfc380bdd0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"8ba7b7c1dad1f6503c541778f31b33f7f62eb966\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"c5402fb5f71f1a725f1e55d9c6799c0c7bec308f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"77ff465799c60294e248000cd22ae8171da3304c\",\n \"lessThan\": \"2505a981114dcb715f8977b8433f7540854851d8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"mm/zsmalloc.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.14\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.14\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.282\",\n \"lessThanOrEqual\": \"4.14.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.246\",\n \"lessThanOrEqual\": \"4.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.197\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.120\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.45\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.17.13\",\n \"lessThanOrEqual\": \"5.17.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.18.2\",\n \"lessThanOrEqual\": \"5.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.19\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b","https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7","https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c","https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758","https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0","https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966","https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f","https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-49554","license":"CVE Program Terms of Use","key":"cve-program:CVE-2022-49554","identifiers":["CVE-2022-49554"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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