{"id":"CVE-2022-49554","title":"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…","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 4.14, < 4.14.282","linux_kernel >= 4.15, < 4.19.246","linux_kernel >= 4.20, < 5.4.197","linux_kernel >= 5.5, < 5.10.120","linux_kernel >= 5.11, < 5.15.45","linux_kernel >= 5.16, < 5.17.13","linux_kernel >= 5.18, < 5.18.2"],"patched":["linux_kernel 5.18.2"],"published":"2025-02-26","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:24.480","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2022-49554","references":[{"url":"https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00217,"epssPercentile":0.12042,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:18:04.837104Z"},"ingestedAt":"2026-10-15T21:45:11.289Z","slug":"CVE-2022-49554","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `linux_kernel >= 4.14, < 4.14.282`\n- `linux_kernel >= 4.15, < 4.19.246`\n- `linux_kernel >= 4.20, < 5.4.197`\n- `linux_kernel >= 5.5, < 5.10.120`\n- `linux_kernel >= 5.11, < 5.15.45`\n- `linux_kernel >= 5.16, < 5.17.13`\n- `linux_kernel >= 5.18, < 5.18.2`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 5.18.2`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}