[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-CVE-2025-22034":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-04T08:53:30.047Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":18,"aliases":19,"duplicate_of":9,"upstream":20,"downstream":21,"duplicates":48,"related":49,"reserved_at":9,"published_at":54,"modified_at":55,"state":56,"summary":57,"references_raw":66,"kevs":85,"epss":86,"epss_history":89,"metrics":359,"affected":365},"CVE-2025-22034","In the Linux kernel, the following vulnerability has been resolved:\n\nmm/gup: reject FOLL_SPLIT_PMD with hugetlb VMAs\n\nPatch series \"mm: fixes for device-exclusive entries (hmm)\", v2.\n\nDiscussing the PageTail() call in make_device_exclusive_range() with\nWilly, I recently discovered [1] that device-exclusive handling does not\nproperly work with THP, making the hmm-tests selftests fail if THPs are\nenabled on the system.\n\nLooking into more details, I found that hugetlb is not properly fenced,\nand I realized that something that was bugging me for longer -- how\ndevice-exclusive entries interact with mapcounts -- completely breaks\nmigration/swapout/split/hwpoison handling of these folios while they have\ndevice-exclusive PTEs.\n\nThe program below can be used to allocate 1 GiB worth of pages and making\nthem device-exclusive on a kernel with CONFIG_TEST_HMM.\n\nOnce they are device-exclusive, these folios cannot get swapped out\n(proc$pid/smaps_rollup will always indicate 1 GiB RSS no matter how much\none forces memory reclaim), and when having a memory block onlined to\nZONE_MOVABLE, trying to offline it will loop forever and complain about\nfailed migration of a page that should be movable.\n\n# echo offline > /sys/devices/system/memory/memory136/state\n# echo online_movable > /sys/devices/system/memory/memory136/state\n# ./hmm-swap &\n... wait until everything is device-exclusive\n# echo offline > /sys/devices/system/memory/memory136/state\n[  285.193431][T14882] page: refcount:2 mapcount:0 mapping:0000000000000000\n  index:0x7f20671f7 pfn:0x442b6a\n[  285.196618][T14882] memcg:ffff888179298000\n[  285.198085][T14882] anon flags: 0x5fff0000002091c(referenced|uptodate|\n  dirty|active|owner_2|swapbacked|node=1|zone=3|lastcpupid=0x7ff)\n[  285.201734][T14882] raw: ...\n[  285.204464][T14882] raw: ...\n[  285.207196][T14882] page dumped because: migration failure\n[  285.209072][T14882] page_owner tracks the page as allocated\n[  285.210915][T14882] page last allocated via order 0, migratetype\n  Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO),\n  id 14926, tgid 14926 (hmm-swap), ts 254506295376, free_ts 227402023774\n[  285.216765][T14882]  post_alloc_hook+0x197/0x1b0\n[  285.218874][T14882]  get_page_from_freelist+0x76e/0x3280\n[  285.220864][T14882]  __alloc_frozen_pages_noprof+0x38e/0x2740\n[  285.223302][T14882]  alloc_pages_mpol+0x1fc/0x540\n[  285.225130][T14882]  folio_alloc_mpol_noprof+0x36/0x340\n[  285.227222][T14882]  vma_alloc_folio_noprof+0xee/0x1a0\n[  285.229074][T14882]  __handle_mm_fault+0x2b38/0x56a0\n[  285.230822][T14882]  handle_mm_fault+0x368/0x9f0\n...\n\nThis series fixes all issues I found so far.  There is no easy way to fix\nwithout a bigger rework/cleanup.  I have a bunch of cleanups on top (some\nprevious sent, some the result of the discussion in v1) that I will send\nout separately once this landed and I get to it.\n\nI wish we could just use some special present PROT_NONE PTEs instead of\nthese (non-present, non-none) fake-swap entries; but that just results in\nthe same problem we keep having (lack of spare PTE bits), and staring at\nother similar fake-swap entries, that ship has sailed.\n\nWith this series, make_device_exclusive() doesn't actually belong into\nmm/rmap.c anymore, but I'll leave moving that for another day.\n\nI only tested this series with the hmm-tests selftests due to lack of HW,\nso I'd appreciate some testing, especially if the interaction between two\nGPUs wanting a device-exclusive entry works as expected.\n\n\u003Cprogram>\n#include \u003Cstdio.h>\n#include \u003Cfcntl.h>\n#include \u003Cstdint.h>\n#include \u003Cunistd.h>\n#include \u003Cstdlib.h>\n#include \u003Cstring.h>\n#include \u003Csys/mman.h>\n#include \u003Csys/ioctl.h>\n#include \u003Clinux/types.h>\n#include \u003Clinux/ioctl.h>\n\n#define HMM_DMIRROR_EXCLUSIVE _IOWR('H', 0x05, struct hmm_dmirror_cmd)\n\nstruct hmm_dmirror_cmd {\n\t__u64 addr;\n\t__u64 ptr;\n\t__u64 npages;\n\t__u64 cpages;\n\t__u64 faults;\n};\n\nconst size_t size = 1 * 1024 * 1024 * 1024ul;\nconst size_t chunk_size = 2 * 1024 * 1024ul;\n\nint m\n---truncated---",null,[11],{"_key":12,"id":12,"name":13,"description":14,"type":15,"status":16,"abstraction":9,"likelihood_of_exploit":9,"capec":17},"NVD-CWE-NOINFO","Insufficient Information","NVD uses this CWE ID when there is insufficient information to assign a specific 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