{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38102",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38102"
  ],
  "published": "2025-07-03T08:36:23Z",
  "summary": "VMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nVMCI: fix race between vmci_host_setup_notify and vmci_ctx_unset_notify\n\nDuring our test, it is found that a warning can be trigger in try_grab_folio\nas follow:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 0 PID: 1678 at mm/gup.c:147 try_grab_folio+0x106/0x130\n  Modules linked in:\n  CPU: 0 UID: 0 PID: 1678 Comm: syz.3.31 Not tainted 6.15.0-rc5 #163 PREEMPT(undef)\n  RIP: 0010:try_grab_folio+0x106/0x130\n  Call Trace:\n   <TASK>\n   follow_huge_pmd+0x240/0x8e0\n   follow_pmd_mask.constprop.0.isra.0+0x40b/0x5c0\n   follow_pud_mask.constprop.0.isra.0+0x14a/0x170\n   follow_page_mask+0x1c2/0x1f0\n   __get_user_pages+0x176/0x950\n   __gup_longterm_locked+0x15b/0x1060\n   ? gup_fast+0x120/0x1f0\n   gup_fast_fallback+0x17e/0x230\n   get_user_pages_fast+0x5f/0x80\n   vmci_host_unlocked_ioctl+0x21c/0xf80\n  RIP: 0033:0x54d2cd\n  ---[ end trace 0000000000000000 ]---\n\nDigging into the source, context->notify_page may init by get_user_pages_fast\nand can be seen in vmci_ctx_unset_notify which will try to put_page. However\nget_user_pages_fast is not finished here and lead to following\ntry_grab_folio warning. The race condition is shown as follow:\n\ncpu0\t\t\tcpu1\nvmci_host_do_set_notify\nvmci_host_setup_notify\nget_user_pages_fast(uva, 1, FOLL_WRITE, &context->notify_page);\nlockless_pages_from_mm\ngup_pgd_range\ngup_huge_pmd  // update &context->notify_page\n\t\t\tvmci_host_do_set_notify\n\t\t\tvmci_ctx_unset_notify\n\t\t\tnotify_page = context->notify_page;\n\t\t\tif (notify_page)\n\t\t\tput_page(notify_page);\t// page is freed\n__gup_longterm_locked\n__get_user_pages\nfollow_trans_huge_pmd\ntry_grab_folio // warn here\n\nTo slove this, use local variable page to make notify_page can be seen\nafter finish get_user_pages_fast.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.142",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38102"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/74095bbbb19ca74a0368d857603a2438c88ca86c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/468aec888f838ce5174b96e0cb4396790d6f60ca"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b4209e4b778e4e57d0636e1c9fc07a924dbc6043"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/58a90db70aa6616411e5f69d1982d9b1dd97d774"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6e3af836805ed1d7a699f76ec798626198917aa4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/00ddc7dad55b7bbb78df80d6e174d0c4764dea0c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/75b5313c80c39a26d27cbb602f968a05576c36f9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1bd6406fb5f36c2bb1e96e27d4c3e9f4d09edde4"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}