{"id":"CVE-2023-52659","state":"PUBLISHED","title":"x86/mm: Ensure input to pfn_to_kaddr() is treated as a 64-bit type","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Ensure input to pfn_to_kaddr() is treated as a 64-bit type\n\nOn 64-bit platforms, the pfn_to_kaddr() macro requires that the input\nvalue is 64 bits in order to ensure that valid address bits don't get\nlost when shifting that input by PAGE_SHIFT to calculate the physical\naddress to provide a virtual address for.\n\nOne such example is in pvalidate_pages() (used by SEV-SNP guests), where\nthe GFN in the struct used for page-state change requests is a 40-bit\nbit-field, so attempts to pass this GFN field directly into\npfn_to_kaddr() ends up causing guest crashes when dealing with addresses\nabove the 1TB range due to the above.\n\nFix this issue with SEV-SNP guests, as well as any similar cases that\nmight cause issues in current/future code, by using an inline function,\ninstead of a macro, so that the input is implicitly cast to the\nexpected 64-bit input type prior to performing the shift operation.\n\nWhile it might be argued that the issue is on the caller side, other\narchs/macros have taken similar approaches to deal with instances like\nthis, such as ARM explicitly casting the input to phys_addr_t:\n\n  e48866647b48 (\"ARM: 8396/1: use phys_addr_t in pfn_to_kaddr()\")\n\nA C inline function is even better though.\n\n[ mingo: Refined the changelog some more & added __always_inline. ]","publishedAt":"2024-05-17T12:08:36.098Z","updatedAt":"2026-05-11T19:31:13.746Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6c3211796326a9d35618b866826ca556c8f008a8","status":"affected","lessThan":"325956b0173f11e98f90462be4829a8b8b0682ce","versionType":"git"},{"version":"6c3211796326a9d35618b866826ca556c8f008a8","status":"affected","lessThan":"7e1471888a5e6e846e9b4d306e5327db2b58e64e","versionType":"git"},{"version":"6c3211796326a9d35618b866826ca556c8f008a8","status":"affected","lessThan":"814305b5c23cb815ada68d43019f39050472b25f","versionType":"git"},{"version":"6c3211796326a9d35618b866826ca556c8f008a8","status":"affected","lessThan":"8e5647a723c49d73b9f108a8bb38e8c29d3948ea","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/include/asm/page.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.6.23","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.11","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8.2","status":"unaffected","lessThanOrEqual":"6.8.*","versionType":"semver"},{"version":"6.9","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/include/asm/page.h"]}],"references":["https://git.kernel.org/stable/c/325956b0173f11e98f90462be4829a8b8b0682ce","https://git.kernel.org/stable/c/7e1471888a5e6e846e9b4d306e5327db2b58e64e","https://git.kernel.org/stable/c/814305b5c23cb815ada68d43019f39050472b25f","https://git.kernel.org/stable/c/8e5647a723c49d73b9f108a8bb38e8c29d3948ea"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52659.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52659","state":"PUBLISHED","datePublished":"2024-05-17T12:08:36.098Z","dateUpdated":"2026-05-11T19:31:13.746Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-03-07T14:49:46.884Z"},"containers":{"cna":{"title":"x86/mm: Ensure input to pfn_to_kaddr() is treated as a 64-bit type","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Ensure input to pfn_to_kaddr() is treated as a 64-bit type\n\nOn 64-bit platforms, the pfn_to_kaddr() macro requires that the input\nvalue is 64 bits in order to ensure that valid address bits don't get\nlost when shifting that input by PAGE_SHIFT to calculate the physical\naddress to provide a virtual address for.\n\nOne such example is in pvalidate_pages() (used by SEV-SNP guests), where\nthe GFN in the struct used for page-state change requests is a 40-bit\nbit-field, so attempts to pass this GFN field directly into\npfn_to_kaddr() ends up causing guest crashes when dealing with addresses\nabove the 1TB range due to the above.\n\nFix this issue with SEV-SNP guests, as well as any similar cases that\nmight cause issues in current/future code, by using an inline function,\ninstead of a macro, so that the input 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