{
  "cveId": "CVE-2024-36892",
  "url": "https://patchblox.com/security/cve/CVE-2024-36892",
  "summary": "CVE-2024-36892 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-36892, released May 30, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  mm/slub: avoid zeroing outside-object freepointe...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/slub: avoid zeroing outside-object freepointer for single free  Commit 284f17ac13fe (\u0022mm/slub: handle bulk and single object freeing separately\u0022) splits single and bulk object freeing in two functions slab_free() and slab_free_bulk() which leads slab_free() to call slab_free_hook() directly instead of slab_free_freelist_hook().  If \u0060init_on_free\u0060 is set, slab_free_hook() zeroes the object. Afterward, if \u0060slub_debug=F\u0060 and \u0060CONFIG_SLAB_FREELIST_HARDENED\u0060 are set, the do_slab_free() slowpath executes freelist consistency checks and try to decode a zeroed freepointer which leads to a \u0022Freepointer corrupt\u0022 detection in check_object().  During bulk free, slab_free_freelist_hook() isn\u0027t affected as it always sets it objects freepointer using set_freepointer() to maintain its reconstructed freelist after \u0060init_on_free\u0060.  For single free, object\u0027s freepointer thus needs to be avoided when stored outside the object if \u0060init_on_free\u0060 is set. The freepointer left as is, check_object() may later detect an invalid pointer value due to objects overflow.  To reproduce, set \u0060slub_debug=FU init_on_free=1 log_level=7\u0060 on the command line of a kernel build with \u0060CONFIG_SLAB_FREELIST_HARDENED=y\u0060.  dmesg sample log: [   10.708715] ============================================================================= [   10.710323] BUG kmalloc-rnd-05-32 (Tainted: G    B           T ): Freepointer corrupt [   10.712695] ----------------------------------------------------------------------------- [   10.712695] [   10.712695] Slab 0xffffd8bdc400d580 objects=32 used=4 fp=0xffff9d9a80356f80 flags=0x200000000000a00(workingset|slab|node=0|zone=2) [   10.716698] Object 0xffff9d9a80356600 @offset=1536 fp=0x7ee4f480ce0ecd7c [   10.716698] [   10.716698] Bytes b4 ffff9d9a803565f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................ [   10.720703] Object   ffff9d9a80356600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................ [   10.720703] Object   ffff9d9a80356610: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................ [   10.724696] Padding  ffff9d9a8035666c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................ [   10.724696] Padding  ffff9d9a8035667c: 00 00 00 00                                      .... [   10.724696] FIX kmalloc-rnd-05-32: Object at 0xffff9d9a80356600 not freed",
  "published": "2024-05-30T16:15:12Z",
  "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": 0.00196,
  "epssPercentile": 0.09378,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.8.11-1",
      "fix": "DEBIAN-CVE-2024-36892",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-36892",
      "released": "2024-05-30T16:15:12Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.8.11-1",
      "fix": "DEBIAN-CVE-2024-36892",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-36892",
      "released": "2024-05-30T16:15:12Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}