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vuln-cve/data/2026/43xxx/CVE-2026-43303.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-43303",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-05-01T14:12:56.000Z",
"datePublished": "2026-05-08T13:11:23.561Z",
"dateUpdated": "2026-11-10T12:46:40.101Z"
},
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"dateUpdated": "2026-08-05T12:27:08.856Z"
},
"descriptions": [
{
"lang": "en",
"value": "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."
}
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"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
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"lang": "en",
"value": "AV:L - The vulnerable swap continuation and page allocator paths are reached through local memory-management activity such as fork/swap/reclaim or swap administration, not by remote packets or physical access.\nAC:L - There is no attacker-uncontrolled race; a local attacker can repeatedly create swap pressure and duplicate swapped entries to drive the continuation path, and allocator grooming is under attacker influence.\nPR:L - Although swapon/swapoff require CAP_SYS_ADMIN in init_user_ns, the same vulnerable swap_count_continued() path is reachable by an unprivileged local user through normal swapped PTE duplication paths once swap is active.\nUI:N - No victim action is required after the attacker has local execution; the trigger can be driven by the attacker's own processes and memory activity.\nS:U - The impact remains within the kernel and the same host security authority; this is not a VM escape or cross-boundary IOMMU/DMA issue.\nC:H - The stale page->private value causes a use-after-free style interpretation of stale struct page list metadata, leading to wild kernel memory accesses that can plausibly be shaped into information disclosure.\nI:H - swap_count_continued() can write through a page derived from stale list pointers, making this kernel memory corruption with plausible arbitrary write/control-flow impact.\nA:H - The reported failure is a KASAN wild-memory-access crash in __do_sys_swapoff, and the same invalid list traversal can oops or panic the kernel."
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}
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"cpeApplicability": [
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"nodes": [
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"url": "https://git.kernel.org/stable/c/e7790ab165713b79b1617ce659742ceb3a859d05"
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{
"url": "https://git.kernel.org/stable/c/ac1ea219590c09572ed5992dc233bbf7bb70fef9"
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"title": "mm/page_alloc: clear page->private in free_pages_prepare()",
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"content": {
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"role": "CISA Coordinator",
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{
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}
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