{"id":"CVE-2026-43303","summary":"mm/page_alloc: clear page-\u003eprivate in free_pages_prepare()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: clear page-\u003eprivate in free_pages_prepare()\n\nSeveral subsystems (slub, shmem, ttm, etc.) use page-\u003eprivate but don't\nclear it before freeing pages.  When these pages are later allocated as\nhigh-order pages and split via split_page(), tail pages retain stale\npage-\u003eprivate values.\n\nThis causes a use-after-free in the swap subsystem.  The swap code uses\npage-\u003eprivate to track swap count continuations, assuming freshly\nallocated pages have page-\u003eprivate == 0.  When stale values are present,\nswap_count_continued() incorrectly assumes the continuation list is valid\nand iterates over uninitialized page-\u003elru containing LIST_POISON values,\ncausing a crash:\n\n  KASAN: maybe wild-memory-access in range [0xdead000000000100-0xdead000000000107]\n  RIP: 0010:__do_sys_swapoff+0x1151/0x1860\n\nFix this by clearing page-\u003eprivate in free_pages_prepare(), ensuring all\nfreed pages have clean state regardless of previous use.","modified":"2026-06-23T03:54:37.643441205Z","published":"2026-05-08T13:11:23.561Z","related":["ALSA-2026:21556","ALSA-2026:21557"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43303.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43303.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43303"},{"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":"3b8000ae185cb068adbda5f966a3835053c85fd4"},{"fixed":"e7790ab165713b79b1617ce659742ceb3a859d05"},{"fixed":"3edb8ebbf79b9016040e8f3421d723ae3d542b32"},{"fixed":"f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b"},{"fixed":"23b82b7a26182ad840ae67d390d7ec9771e8c00f"},{"fixed":"d757c793853ec5483eb41ec2942c300b8fa720fb"},{"fixed":"ac1ea219590c09572ed5992dc233bbf7bb70fef9"}]}],"versions":["v6.6.142","v6.1.175","v6.12.92","v6.12.91","v6.6.141","v6.1.174","v6.1.173","v6.12.90","v6.6.140","v6.12.89","v6.6.139","v6.12.88","v6.6.138","v6.1.172","v6.12.87","v6.1.171","v6.1.170","v6.12.86","v6.6.137","v6.12.85","v6.1.169","v6.6.136","v6.12.84","v6.12.83","v6.6.135","v6.12.82","v6.12.81","v6.6.134","v6.1.168","v6.12.80","v6.6.133","v6.1.167","v6.6.132","v6.19-rc2","v6.6.131","v6.12.79","v6.6.130","v6.19","v6.12.78","v6.12.77","v6.6.129","v6.1.166","v6.12.76","v6.1.165","v6.6.128","v6.12.75","v6.18.15","v6.19.5","v6.6.127","v6.12.74","v6.1.164","v6.19.4","v6.18.14","v6.19.3","v6.18.13","v6.19.2","v6.18.12","v6.12.73","v6.6.126","v6.1.163","v6.19.1","v6.18.11","v6.12.72","v6.6.125","v6.18.10","v6.12.71","v6.6.124","v6.12.70","v6.18.9","v6.12.69","v6.6.123","v6.1.162","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.18.8","v6.12.68","v6.6.122","v6.1.161","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.18.7","v6.12.67","v6.6.121","v6.19-rc3","v6.18.6","v6.12.66","v6.1.160","v6.18.5","v6.12.65","v6.6.120","v6.18.4","v6.12.64","v6.6.119","v6.1.159","v6.18.3","v6.12.63","v6.18.2","v6.18.1","v6.12.62","v6.18","v6.12.61","v6.18-rc1","v6.12.60","v6.6.118","v6.1.158","v6.18-rc7","v6.18-rc3","v6.12.59","v6.6.117","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.12.58","v6.6.116","v6.18-rc4","v6.12.57","v6.12.56","v6.6.115","v6.12.55","v6.6.114","v6.1.157","v6.12.54","v6.6.113","v6.12.53","v6.6.112","v6.1.156","v6.12.52","v6.6.111","v6.1.155","v6.12.51","v6.6.110","v6.17","v6.17-rc7","v6.12.50","v6.6.109","v6.17-rc1","v6.17-rc2","v6.12.49","v6.6.108","v6.1.154","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.6.107","v6.1.153","v6.12.47","v6.6.106","v6.1.152","v6.12.46","v6.6.105","v6.1.151","v6.12.45","v6.6.104","v6.1.150","v6.12.44","v6.6.103","v6.1.149","v6.12.43","v6.6.102","v6.1.148","v6.12.42","v6.12.41","v6.6.101","v6.1.147","v6.16-rc6","v6.12.40","v6.6.100","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.12.39","v6.6.99","v6.1.146","v6.14-rc3","v6.12.38","v6.6.98","v6.1.145","v6.12.37","v6.6.97","v6.1.144","v6.12.36","v6.6.96","v6.1.143","v6.12.35","v6.6.95","v6.1.142","v6.12.34","v6.6.94","v6.1.141","v6.12.33","v6.6.93","v6.15","v6.12.32","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.12.31","v6.6.92","v6.1.140","v6.12.30","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.12.29","v6.6.91","v6.1.139","v6.12.28","v6.6.90","v6.1.138","v6.15-rc5","v6.12.27","v6.6.89","v6.1.137","v6.12.26","v6.1.136","v6.14","v6.12.25","v6.6.88","v6.1.135","v6.12.24","v6.6.87","v6.1.134","v6.12.23","v6.12.22","v6.6.86","v6.1.133","v6.12.21","v6.6.85","v6.1.132","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.12.20","v6.6.84","v6.1.131","v6.14-rc4","v6.14-rc5","v6.12.19","v6.6.83","v6.14-rc2","v6.12.18","v6.6.82","v6.1.130","v6.6.81","v6.12.17","v6.1.129","v6.6.80","v6.12.16","v6.6.79","v6.12.15","v6.6.78","v6.1.128","v6.13","v6.12.14","v6.13-rc1","v6.12.13","v6.6.77","v6.6.76","v6.12.12","v6.6.75","v6.12.11","v6.6.74","v6.1.127","v6.13-rc6","v6.12.10","v6.6.73","v6.1.126","v6.6.72","v6.13-rc7","v6.1.125","v6.13-rc2","v6.12.9","v6.6.71","v6.1.124","v6.13-rc5","v6.13-rc3","v6.6.70","v6.12.8","v6.6.69","v6.1.123","v6.12-rc1","v6.13-rc4","v6.12.7","v6.6.68","v6.1.122","v6.12.6","v6.6.67","v6.1.121","v6.12.5","v6.6.66","v6.1.120","v6.12.4","v6.6.65","v6.1.119","v6.6.64","v6.12","v6.12.3"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