{"id":"CVE-2026-64415","summary":"mm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/swap: add cond_resched() in swap_reclaim_full_clusters to prevent softlockup\n\nWe hit a real softlockup in an internal stress test environment.  The\nworkload was LTP memory/swap stress on a large arm64 machine, with 320\nCPUs, about 1TB memory and an 8.6GB swap device.  The system was under\nheavy load and the swap device had a large number of full clusters.  The\nsoftlockup was triggered during a stress test after about 3 days.\n\nSo, add periodic cond_resched() calls during large full_clusters\nreclaim operations to prevent softlockup issues.\n\nDetailed call trace as follow:\n\nPID: 3817773  TASK: ffff0883bb28b780  CPU: 48   COMMAND: \"kworker/48:7\"\n   #0 [ffff800080183d10] __crash_kexec at ffffa4c1361e5de4\n   #1 [ffff800080183d90] panic at ffffa4c1360d5e9c\n   #2 [ffff800080183e20] watchdog_timer_fn at ffffa4c136231fa8\n   ...\n  #16 [ffff8000c4ad3cb0] swap_cache_del_folio at ffffa4c1363e1614\n  #17 [ffff8000c4ad3ce0] __try_to_reclaim_swap at ffffa4c1363e4bfc\n  #18 [ffff8000c4ad3d40] swap_reclaim_full_clusters at ffffa4c1363e5474\n  #19 [ffff8000c4ad3da0] swap_reclaim_work at ffffa4c1363e550c\n  #20 [ffff8000c4ad3dc0] process_one_work at ffffa4c136102edc\n  #21 [ffff8000c4ad3e10] worker_thread at ffffa4c136103398\n  #22 [ffff8000c4ad3e70] kthread at ffffa4c13610d95c","modified":"2026-09-06T03:30:13.729621917Z","published":"2026-07-25T08:50:55.226Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64415.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2a55fdf9f746a1a6ced7fd62ea1080b8a917e0b0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/60cbe67d1342f34b66df1c2ee328e3cd333767d7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/66366d291f666ddeda5f8c84f253e308de3e6b55"},{"type":"WEB","url":"https://git.kernel.org/stable/c/69c0e6246575b780ae0d3f411c749bcf13c221f3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64415.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64415"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5168a68eb78fa1c67a8b2d31d0642c7fd866cc12"},{"fixed":"60cbe67d1342f34b66df1c2ee328e3cd333767d7"},{"fixed":"69c0e6246575b780ae0d3f411c749bcf13c221f3"},{"fixed":"2a55fdf9f746a1a6ced7fd62ea1080b8a917e0b0"},{"fixed":"66366d291f666ddeda5f8c84f253e308de3e6b55"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64415.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64415.json"}}],"schema_version":"1.9.0"}