{
  "cveId": "CVE-2025-22034",
  "url": "https://patchblox.com/security/cve/CVE-2025-22034",
  "summary": "CVE-2025-22034 is fixed in 70 products on 1 platform, first by DEBIAN-CVE-2025-22034, released April 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/gup: reject FOLL_SPLIT_PMD with hugetlb VMAs...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/gup: reject FOLL_SPLIT_PMD with hugetlb VMAs  Patch series \u0022mm: fixes for device-exclusive entries (hmm)\u0022, v2.  Discussing the PageTail() call in make_device_exclusive_range() with Willy, I recently discovered [1] that device-exclusive handling does not properly work with THP, making the hmm-tests selftests fail if THPs are enabled on the system.  Looking into more details, I found that hugetlb is not properly fenced, and I realized that something that was bugging me for longer -- how device-exclusive entries interact with mapcounts -- completely breaks migration/swapout/split/hwpoison handling of these folios while they have device-exclusive PTEs.  The program below can be used to allocate 1 GiB worth of pages and making them device-exclusive on a kernel with CONFIG_TEST_HMM.  Once they are device-exclusive, these folios cannot get swapped out (proc$pid/smaps_rollup will always indicate 1 GiB RSS no matter how much one forces memory reclaim), and when having a memory block onlined to ZONE_MOVABLE, trying to offline it will loop forever and complain about failed migration of a page that should be movable.  # echo offline \u003E /sys/devices/system/memory/memory136/state # echo online_movable \u003E /sys/devices/system/memory/memory136/state # ./hmm-swap \u0026 ... wait until everything is device-exclusive # echo offline \u003E /sys/devices/system/memory/memory136/state [  285.193431][T14882] page: refcount:2 mapcount:0 mapping:0000000000000000   index:0x7f20671f7 pfn:0x442b6a [  285.196618][T14882] memcg:ffff888179298000 [  285.198085][T14882] anon flags: 0x5fff0000002091c(referenced|uptodate|   dirty|active|owner_2|swapbacked|node=1|zone=3|lastcpupid=0x7ff) [  285.201734][T14882] raw: ... [  285.204464][T14882] raw: ... [  285.207196][T14882] page dumped because: migration failure [  285.209072][T14882] page_owner tracks the page as allocated [  285.210915][T14882] page last allocated via order 0, migratetype   Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO),   id 14926, tgid 14926 (hmm-swap), ts 254506295376, free_ts 227402023774 [  285.216765][T14882]  post_alloc_hook\u002B0x197/0x1b0 [  285.218874][T14882]  get_page_from_freelist\u002B0x76e/0x3280 [  285.220864][T14882]  __alloc_frozen_pages_noprof\u002B0x38e/0x2740 [  285.223302][T14882]  alloc_pages_mpol\u002B0x1fc/0x540 [  285.225130][T14882]  folio_alloc_mpol_noprof\u002B0x36/0x340 [  285.227222][T14882]  vma_alloc_folio_noprof\u002B0xee/0x1a0 [  285.229074][T14882]  __handle_mm_fault\u002B0x2b38/0x56a0 [  285.230822][T14882]  handle_mm_fault\u002B0x368/0x9f0 ...  This series fixes all issues I found so far.  There is no easy way to fix without a bigger rework/cleanup.  I have a bunch of cleanups on top (some previous sent, some the result of the discussion in v1) that I will send out separately once this landed and I get to it.  I wish we could just use some special present PROT_NONE PTEs instead of these (non-present, non-none) fake-swap entries; but that just results in the same problem we keep having (lack of spare PTE bits), and staring at other similar fake-swap entries, that ship has sailed.  With this series, make_device_exclusive() doesn\u0027t actually belong into mm/rmap.c anymore, but I\u0027ll leave moving that for another day.  I only tested this series with the hmm-tests selftests due to lack of HW, so I\u0027d appreciate some testing, especially if the interaction between two GPUs wanting a device-exclusive entry works as expected.  \u003Cprogram\u003E #include \u003Cstdio.h\u003E #include \u003Cfcntl.h\u003E #include \u003Cstdint.h\u003E #include \u003Cunistd.h\u003E #include \u003Cstdlib.h\u003E #include \u003Cstring.h\u003E #include \u003Csys/mman.h\u003E #include \u003Csys/ioctl.h\u003E #include \u003Clinux/types.h\u003E #include \u003Clinux/ioctl.h\u003E  #define HMM_DMIRROR_EXCLUSIVE _IOWR(\u0027H\u0027, 0x05, struct hmm_dmirror_cmd)  struct hmm_dmirror_cmd { \t__u64 addr; \t__u64 ptr; \t__u64 npages; \t__u64 cpages; \t__u64 faults; };  const size_t size = 1 * 1024 * 1024 * 1024ul; const size_t chunk_size = 2 * 1024 * 1024ul;  int m ---truncated---",
  "published": "2025-04-16T15:15:56Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00277,
  "epssPercentile": 0.2029,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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