{
  "cveId": "CVE-2024-46847",
  "url": "https://patchblox.com/security/cve/CVE-2024-46847",
  "summary": "CVE-2024-46847 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-46847, released September 27, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm: vmalloc: ensure vmap_block is initialised be...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm: vmalloc: ensure vmap_block is initialised before adding to queue  Commit 8c61291fd850 (\u0022mm: fix incorrect vbq reference in purge_fragmented_block\u0022) extended the \u0027vmap_block\u0027 structure to contain a \u0027cpu\u0027 field which is set at allocation time to the id of the initialising CPU.  When a new \u0027vmap_block\u0027 is being instantiated by new_vmap_block(), the partially initialised structure is added to the local \u0027vmap_block_queue\u0027 xarray before the \u0027cpu\u0027 field has been initialised.  If another CPU is concurrently walking the xarray (e.g.  via vm_unmap_aliases()), then it may perform an out-of-bounds access to the remote queue thanks to an uninitialised index.  This has been observed as UBSAN errors in Android:   | Internal error: UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP  |  | Call trace:  |  purge_fragmented_block\u002B0x204/0x21c  |  _vm_unmap_aliases\u002B0x170/0x378  |  vm_unmap_aliases\u002B0x1c/0x28  |  change_memory_common\u002B0x1dc/0x26c  |  set_memory_ro\u002B0x18/0x24  |  module_enable_ro\u002B0x98/0x238  |  do_init_module\u002B0x1b0/0x310  Move the initialisation of \u0027vb-\u003Ecpu\u0027 in new_vmap_block() ahead of the addition to the xarray.",
  "published": "2024-09-27T13:15:16Z",
  "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": 0.00227,
  "epssPercentile": 0.13565,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.10.11-1",
      "fix": "DEBIAN-CVE-2024-46847",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-46847",
      "released": "2024-09-27T13:15:16Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.10.11-1",
      "fix": "DEBIAN-CVE-2024-46847",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-46847",
      "released": "2024-09-27T13:15:16Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}