{"id":"CVE-2026-43303","revision":"862f8b107189467ab15e819b9b7f08a9","records":[{"revision":"862f8b107189467ab15e819b9b7f08a9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43303","aliases":[],"title":"mm/page_alloc: clear page->private in free_pages_prepare()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: clear page->private in free_pages_prepare()\n\nSeveral subsystems (slub, shmem, ttm, etc.) use page->private 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->private values.\n\nThis causes a use-after-free in the swap subsystem.  The swap code uses\npage->private to track swap count continuations, assuming freshly\nallocated pages have page->private == 0.  When stale values are present,\nswap_count_continued() incorrectly assumes the continuation list is valid\nand iterates over uninitialized page->lru 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->private in free_pages_prepare(), ensuring all\nfreed pages have clean state regardless of previous use.","state":0,"publishedAt":"2026-05-08T13:11:23.561+00:00","modifiedAt":"2026-10-19T19:16:26.022+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/page_alloc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3b8000ae185cb068adbda5f966a3835053c85fd4\",\n                            \"lessThan\": \"e7790ab165713b79b1617ce659742ceb3a859d05\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3b8000ae185cb068adbda5f966a3835053c85fd4\",\n                            \"lessThan\": \"3edb8ebbf79b9016040e8f3421d723ae3d542b32\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3b8000ae185cb068adbda5f966a3835053c85fd4\",\n                            \"lessThan\": \"f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3b8000ae185cb068adbda5f966a3835053c85fd4\",\n                            \"lessThan\": \"23b82b7a26182ad840ae67d390d7ec9771e8c00f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3b8000ae185cb068adbda5f966a3835053c85fd4\",\n                            \"lessThan\": \"d757c793853ec5483eb41ec2942c300b8fa720fb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3b8000ae185cb068adbda5f966a3835053c85fd4\",\n                            \"lessThan\": \"ac1ea219590c09572ed5992dc233bbf7bb70fef9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"mm/page_alloc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.176\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.143\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.93\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.16\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.6\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05","https://git.kernel.org/stable/c/3edb8ebbf79b9016040e8f3421d723ae3d542b32","https://git.kernel.org/stable/c/f9719e32a67b4b00b3c9b133e8b5ffa72a26b67b","https://git.kernel.org/stable/c/23b82b7a26182ad840ae67d390d7ec9771e8c00f","https://git.kernel.org/stable/c/d757c793853ec5483eb41ec2942c300b8fa720fb","https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43303","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43303","identifiers":["CVE-2026-43303"]},"retained":false,"historicalAffected":[]}],"coverage":[]}