{"id":"CVE-2025-21931","summary":"hwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwpoison, memory_hotplug: lock folio before unmap hwpoisoned folio\n\nCommit b15c87263a69 (\"hwpoison, memory_hotplug: allow hwpoisoned pages to\nbe offlined) add page poison checks in do_migrate_range in order to make\noffline hwpoisoned page possible by introducing isolate_lru_page and\ntry_to_unmap for hwpoisoned page.  However folio lock must be held before\ncalling try_to_unmap.  Add it to fix this problem.\n\nWarning will be produced if folio is not locked during unmap:\n\n  ------------[ cut here ]------------\n  kernel BUG at ./include/linux/swapops.h:400!\n  Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP\n  Modules linked in:\n  CPU: 4 UID: 0 PID: 411 Comm: bash Tainted: G        W          6.13.0-rc1-00016-g3c434c7ee82a-dirty #41\n  Tainted: [W]=WARN\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  pc : try_to_unmap_one+0xb08/0xd3c\n  lr : try_to_unmap_one+0x3dc/0xd3c\n  Call trace:\n   try_to_unmap_one+0xb08/0xd3c (P)\n   try_to_unmap_one+0x3dc/0xd3c (L)\n   rmap_walk_anon+0xdc/0x1f8\n   rmap_walk+0x3c/0x58\n   try_to_unmap+0x88/0x90\n   unmap_poisoned_folio+0x30/0xa8\n   do_migrate_range+0x4a0/0x568\n   offline_pages+0x5a4/0x670\n   memory_block_action+0x17c/0x374\n   memory_subsys_offline+0x3c/0x78\n   device_offline+0xa4/0xd0\n   state_store+0x8c/0xf0\n   dev_attr_store+0x18/0x2c\n   sysfs_kf_write+0x44/0x54\n   kernfs_fop_write_iter+0x118/0x1a8\n   vfs_write+0x3a8/0x4bc\n   ksys_write+0x6c/0xf8\n   __arm64_sys_write+0x1c/0x28\n   invoke_syscall+0x44/0x100\n   el0_svc_common.constprop.0+0x40/0xe0\n   do_el0_svc+0x1c/0x28\n   el0_svc+0x30/0xd0\n   el0t_64_sync_handler+0xc8/0xcc\n   el0t_64_sync+0x198/0x19c\n  Code: f9407be0 b5fff320 d4210000 17ffff97 (d4210000)\n  ---[ end trace 0000000000000000 ]---","modified":"2026-07-15T01:49:05.410573949Z","published":"2025-04-01T15:41:01.055Z","related":["SUSE-SU-2025:01600-1","SUSE-SU-2025:01614-1","SUSE-SU-2025:01707-1","SUSE-SU-2025:01919-1","SUSE-SU-2025:01951-1","SUSE-SU-2025:01964-1","SUSE-SU-2025:01967-1","SUSE-SU-2025:20343-1","SUSE-SU-2025:20344-1","SUSE-SU-2025:20354-1","SUSE-SU-2025:20355-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21931.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3926b572fd073491bde13ec42ee08ac1b337bf4d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/576a2f4c437c19bec7d05d05b5990f178d2b0f40"},{"type":"WEB","url":"https://git.kernel.org/stable/c/629dfc6ba5431056701d4e44830f3409b989955a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/93df6da64b004f75d307ed08d3f0f1020280d339"},{"type":"WEB","url":"https://git.kernel.org/stable/c/af288a426c3e3552b62595c6138ec6371a17dbba"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21931.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21931"},{"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":"b15c87263a69272423771118c653e9a1d0672caa"},{"fixed":"3926b572fd073491bde13ec42ee08ac1b337bf4d"},{"fixed":"93df6da64b004f75d307ed08d3f0f1020280d339"},{"fixed":"576a2f4c437c19bec7d05d05b5990f178d2b0f40"},{"fixed":"629dfc6ba5431056701d4e44830f3409b989955a"},{"fixed":"af288a426c3e3552b62595c6138ec6371a17dbba"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"85ef35ab972b7484f41c3bb2bbc79de212e19129"},{"last_affected":"060853fdd434ce620dd1dd7619ede834bd33b9d0"},{"last_affected":"cb1206e85df291fefde27401190329e26996c54c"},{"last_affected":"2c25071bed4b1f9c4cfb10a7914847d7069794bf"},{"last_affected":"2c87072a3bf9bbcd747618bb2ccc3cd0da181db6"},{"last_affected":"a2b977e3d9e4298d28ebe5cfff9e0859b74a7ac7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.16.65"},{"fixed":"3.17"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.170"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.150"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.93"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.15"},{"fixed":"4.20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.20.2"},{"fixed":"4.21"}]}],"versions":["v3.16.64","v3.16.63","v3.16.62","v4.20-rc1","v4.19","v4.20","v4.4.169","v4.9.149","v4.14.92","v4.19.14","v4.20.1","v4.19.13","v4.14.91","v4.9.148","v4.20-rc7","v4.20-rc5","v4.9.147","v4.14.90","v4.19.12","v4.20-rc6","v4.19.11","v4.14.89","v4.9.146","v4.4.168","v4.19.10","v4.20-rc4","v4.20-rc2","v4.4.167","v4.9.145","v4.14.88","v4.19.9","v3.16.61","v4.4.166","v4.9.144","v4.14.87","v4.19.8","v4.20-rc3","v4.9.143","v4.14.86","v4.19.7","v4.9.142","v4.14.85","v4.19.6","v4.4.165","v4.9.141","v4.14.84","v4.19.5","v4.19.4","v4.14.83","v4.9.140","v4.4.164","v4.9.139","v4.9.138","v4.14.82","v4.19.3","v4.4.163","v4.9.137","v4.14.81","v4.19.2","v3.16.60","v4.9.136","v4.14.80","v4.19.1","v4.14.79","v4.9.135","v4.4.162","v4.14.78","v4.19-rc2","v4.19-rc8","v3.16.59","v4.19-rc4","v4.4.161","v4.9.134","v4.14.77","v4.19-rc1","v4.14.76","v4.9.133","v4.19-rc7","v4.14.75","v4.9.132","v4.4.160","v4.14.74","v4.9.131","v4.4.159","v4.19-rc6","v4.19-rc5","v4.9.130","v4.14.73","v3.16.58","v4.19-rc3","v4.4.158","v4.9.129","v4.14.72","v4.14.71","v4.9.128","v4.4.157","v3.16.57","v4.4.156","v4.9.127","v4.14.70","v4.14.69","v4.9.126","v4.4.155","v4.4.154","v4.9.125","v4.14.68","v4.14.67","v4.9.124","v4.4.153","v4.4.152","v4.4.151","v4.9.123","v4.14.66","v4.18","v4.4.150","v4.9.122","v4.14.65","v4.14.64","v4.9.121","v4.4.149","v4.14.63","v4.9.120","v4.4.148","v4.18-rc1","v4.9.119","v4.14.62","v4.4.147","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.4.146","v4.9.118","v4.14.61","v4.18-rc6","v4.4.145","v4.9.117","v4.14.60","v4.18-rc7","v4.9.116","v4.14.59","v4.17","v4.14.58","v4.9.115","v4.4.144","v4.18-rc3","v4.14.57","v4.9.114","v4.4.143","v4.14.56","v4.9.113","v4.4.142","v4.18-rc4","v4.4.141","v4.14.55","v4.9.112","v4.4.140","v4.14.54","v4.9.111","v4.4.139","v4.14.53","v4.14.52","v4.9.110","v4.4.138","v4.9.109","v4.14.51","v4.14.50","v3.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