{"cve":"CVE-2022-48800","nvd":{"published":"2024-07-16T12:15:04.563","modified":"2026-06-17T05:16:13.610","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm: vmscan: remove deadlock due to throttling failing to make progress\n\nA soft lockup bug in kcompactd was reported in a private bugzilla with\nthe following visible in dmesg;\n\n  watchdog: BUG: soft lockup - CPU#33 stuck for 26s! [kcompactd0:479]\n  watchdog: BUG: soft lockup - CPU#33 stuck for 52s! [kcompactd0:479]\n  watchdog: BUG: soft lockup - CPU#33 stuck for 78s! [kcompactd0:479]\n  watchdog: BUG: soft lockup - CPU#33 stuck for 104s! [kcompactd0:479]\n\nThe machine had 256G of RAM with no swap and an earlier failed\nallocation indicated that node 0 where kcompactd was run was potentially\nunreclaimable;\n\n  Node 0 active_anon:29355112kB inactive_anon:2913528kB active_file:0kB\n    inactive_file:0kB unevictable:64kB isolated(anon):0kB isolated(file):0kB\n    mapped:8kB dirty:0kB writeback:0kB shmem:26780kB shmem_thp:\n    0kB shmem_pmdmapped: 0kB anon_thp: 23480320kB writeback_tmp:0kB\n    kernel_stack:2272kB pagetables:24500kB all_unreclaimable? yes\n\nVlastimil Babka investigated a crash dump and found that a task\nmigrating pages was trying to drain PCP lists;\n\n  PID: 52922  TASK: ffff969f820e5000  CPU: 19  COMMAND: \"kworker/u128:3\"\n  Call Trace:\n     __schedule\n     schedule\n     schedule_timeout\n     wait_for_completion\n     __flush_work\n     __drain_all_pages\n     __alloc_pages_slowpath.constprop.114\n     __alloc_pages\n     alloc_migration_target\n     migrate_pages\n     migrate_to_node\n     do_migrate_pages\n     cpuset_migrate_mm_workfn\n     process_one_work\n     worker_thread\n     kthread\n     ret_from_fork\n\nThis failure is specific to CONFIG_PREEMPT=n builds.  The root of the\nproblem is that kcompact0 is not rescheduling on a CPU while a task that\nhas isolated a large number of the pages from the LRU is waiting on\nkcompact0 to reschedule so the pages can be released.  While\nshrink_inactive_list() only loops once around too_many_isolated, reclaim\ncan continue without rescheduling if sc->skipped_deactivate == 1 which\ncould happen if there was no file LRU and the inactive anon list was not\nlow.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/3980cff6349687f73d5109f156f23cb261c24164","https://git.kernel.org/stable/c/b485c6f1f9f54b81443efda5f3d8a5036ba2cd91","https://git.kernel.org/stable/c/3980cff6349687f73d5109f156f23cb261c24164","https://git.kernel.org/stable/c/b485c6f1f9f54b81443efda5f3d8a5036ba2cd91"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:52:42.518321223+00:00"},"epss":{"cve":"CVE-2022-48800","score":0.00157,"percentile":0.04815,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}