{"id":"CVE-2026-53342","state":"PUBLISHED","title":"arm64: mm: call pagetable dtor when freeing hot-removed page tables","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: call pagetable dtor when freeing hot-removed page tables\n\nSince 5e8eb9aeeda3 (\"arm64: mm: always call PTE/PMD ctor in\n__create_pgd_mapping()\") page-table allocation on ARM64 always calls\npagetable_{pte,pmd,pud,p4d}_ctor().  This sets the page_type to\nPGTY_table, increments NR_PAGETABLE and possible allocates a PTL.  However\nthe matching pagetable_dtor() calls were never added.\n\nWith DEBUG_VM enabled on kernel versions prior to v6.17 without\n2dfcd1608f3a9 (\"mm/page_alloc: let page freeing clear any set page type\")\nthis leads to the following warning when freeing these pages due to\npage->page_type sharing page->_mapcount:\n\n  BUG: Bad page state in process ... pfn:284fbb\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x284fbb\n  flags: 0x17fffc000000000(node=0|zone=2|lastcpupid=0x1ffff)\n  page_type: f2(table)\n  page dumped because: nonzero mapcount\n  Call trace:\n   bad_page+0x13c/0x160\n   __free_frozen_pages+0x6cc/0x860\n   ___free_pages+0xf4/0x180\n   free_pages+0x54/0x80\n   free_hotplug_page_range.part.0+0x58/0x90\n   free_empty_tables+0x438/0x500\n   __remove_pgd_mapping.constprop.0+0x60/0xa8\n   arch_remove_memory+0x48/0x80\n   try_remove_memory+0x158/0x1d8\n   offline_and_remove_memory+0x138/0x180\n\nIt can also lead to leaking the ptl allocation if ALLOC_SPLIT_PTLOCKS is\ndefined and incorrect NR_PAGETABLE stats.  Fix this by calling\npagetable_dtor() in free_hotplug_pgtable_page() prior to freeing the page\nto undo the effects of calling pagetable_*_ctor().","publishedAt":"2026-07-01T13:32:23.449Z","updatedAt":"2026-07-01T13:32:23.449Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f","status":"affected","lessThan":"95f27fcda681021ed3906d3cae7e68b6a57a1d8e","versionType":"git"},{"version":"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f","status":"affected","lessThan":"aaa688ac9f18207f7452c6472e647c1febaea6a3","versionType":"git"},{"version":"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f","status":"affected","lessThan":"c594b83457ccdee76d458416fb3bc9348a37592f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/mm/mmu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/mm/mmu.c"]}],"references":["https://git.kernel.org/stable/c/95f27fcda681021ed3906d3cae7e68b6a57a1d8e","https://git.kernel.org/stable/c/aaa688ac9f18207f7452c6472e647c1febaea6a3","https://git.kernel.org/stable/c/c594b83457ccdee76d458416fb3bc9348a37592f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53342.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53342","state":"PUBLISHED","datePublished":"2026-07-01T13:32:23.449Z","dateUpdated":"2026-07-01T13:32:23.449Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.399Z"},"containers":{"cna":{"title":"arm64: mm: call pagetable dtor when freeing hot-removed page tables","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: call pagetable dtor when freeing hot-removed page tables\n\nSince 5e8eb9aeeda3 (\"arm64: mm: always call PTE/PMD ctor in\n__create_pgd_mapping()\") page-table allocation on ARM64 always calls\npagetable_{pte,pmd,pud,p4d}_ctor().  This sets the page_type to\nPGTY_table, increments NR_PAGETABLE and possible allocates a PTL.  However\nthe matching pagetable_dtor() calls were never added.\n\nWith DEBUG_VM enabled on kernel versions prior to v6.17 without\n2dfcd1608f3a9 (\"mm/page_alloc: let page freeing clear any set page type\")\nthis leads to the following warning when freeing these pages due to\npage->page_type sharing page->_mapcount:\n\n  BUG: Bad page state in process ... pfn:284fbb\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x284fbb\n  flags: 0x17fffc000000000(node=0|zone=2|lastcpupid=0x1ffff)\n  page_type: f2(table)\n  page dumped because: nonzero mapcount\n  Call trace:\n   bad_page+0x13c/0x160\n   __free_frozen_pages+0x6cc/0x860\n   ___free_pages+0xf4/0x180\n   free_pages+0x54/0x80\n   free_hotplug_page_range.part.0+0x58/0x90\n   free_empty_tables+0x438/0x500\n   __remove_pgd_mapping.constprop.0+0x60/0xa8\n   arch_remove_memory+0x48/0x80\n   try_remove_memory+0x158/0x1d8\n   offline_and_remove_memory+0x138/0x180\n\nIt can also lead to leaking the ptl allocation if ALLOC_SPLIT_PTLOCKS is\ndefined and incorrect NR_PAGETABLE stats.  Fix this by calling\npagetable_dtor() in free_hotplug_pgtable_page() prior to freeing the page\nto undo the effects of calling pagetable_*_ctor()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f","status":"affected","lessThan":"95f27fcda681021ed3906d3cae7e68b6a57a1d8e","versionType":"git"},{"version":"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f","status":"affected","lessThan":"aaa688ac9f18207f7452c6472e647c1febaea6a3","versionType":"git"},{"version":"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f","status":"affected","lessThan":"c594b83457ccdee76d458416fb3bc9348a37592f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/mm/mmu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/arm64/mm/mmu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/95f27fcda681021ed3906d3cae7e68b6a57a1d8e"},{"url":"https://git.kernel.org/stable/c/aaa688ac9f18207f7452c6472e647c1febaea6a3"},{"url":"https://git.kernel.org/stable/c/c594b83457ccdee76d458416fb3bc9348a37592f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-01T13:32:23.449Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}