{"id":"CVE-2024-44965","state":"PUBLISHED","title":"x86/mm: Fix pti_clone_pgtable() alignment assumption","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Fix pti_clone_pgtable() alignment assumption\n\nGuenter reported dodgy crashes on an i386-nosmp build using GCC-11\nthat had the form of endless traps until entry stack exhaust and then\n#DF from the stack guard.\n\nIt turned out that pti_clone_pgtable() had alignment assumptions on\nthe start address, notably it hard assumes start is PMD aligned. This\nis true on x86_64, but very much not true on i386.\n\nThese assumptions can cause the end condition to malfunction, leading\nto a 'short' clone. Guess what happens when the user mapping has a\nshort copy of the entry text?\n\nUse the correct increment form for addr to avoid alignment\nassumptions.","publishedAt":"2024-09-04T18:36:02.762Z","updatedAt":"2026-10-15T00:49:37.897Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"18da1b27ce16a14a9b636af9232acb4fb24f4c9e","versionType":"git"},{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"25a727233a40a9b33370eec9f0cad67d8fd312f8","versionType":"git"},{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6","versionType":"git"},{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"4d143ae782009b43b4f366402e5c37f59d4e4346","versionType":"git"},{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"5c580c1050bcbc15c3e78090859d798dcf8c9763","versionType":"git"},{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed","versionType":"git"},{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"df3eecb5496f87263d171b254ca6e2758ab3c35c","versionType":"git"},{"version":"16a3fe634f6a568c6234b8747e5d50487fed3526","status":"affected","lessThan":"41e71dbb0e0a0fe214545fe64af031303a08524c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/mm/pti.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"4.19.320","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.282","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.224","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.165","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.105","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.46","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.10.5","status":"unaffected","lessThanOrEqual":"6.10.*","versionType":"semver"},{"version":"6.11","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/mm/pti.c"]}],"references":["https://git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4fb24f4c9e","https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8","https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6","https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346","https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763","https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed","https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35c","https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524c","https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html","https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html","https://cert-portal.siemens.com/productcert/html/ssa-398330.html","https://cert-portal.siemens.com/productcert/html/ssa-355557.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:47.831Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/44xxx/CVE-2024-44965.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-44965","state":"PUBLISHED","datePublished":"2024-09-04T18:36:02.762Z","dateUpdated":"2026-10-15T00:49:37.897Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-08-21T05:34:56.667Z"},"containers":{"cna":{"title":"x86/mm: Fix pti_clone_pgtable() alignment assumption","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm: Fix pti_clone_pgtable() alignment assumption\n\nGuenter reported dodgy crashes on an i386-nosmp build using GCC-11\nthat had the form of endless traps until entry stack exhaust and then\n#DF from the stack guard.\n\nIt turned out that pti_clone_pgtable() had alignment assumptions on\nthe start address, notably it hard assumes start is PMD aligned. 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