{
  "cveId": "CVE-2025-39941",
  "url": "https://patchblox.com/security/cve/CVE-2025-39941",
  "summary": "CVE-2025-39941 is fixed in linux on 1 platform by DEBIAN-CVE-2025-39941 (version 6.16.9-1), released October 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  zram: fix slot write race condition  Parallel co...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  zram: fix slot write race condition  Parallel concurrent writes to the same zram index result in leaked zsmalloc handles.  Schematically we can have something like this:  CPU0                              CPU1 zram_slot_lock() zs_free(handle) zram_slot_lock() \t\t\t\tzram_slot_lock() \t\t\t\tzs_free(handle) \t\t\t\tzram_slot_lock()  compress\t\t\tcompress handle = zs_malloc()\t\thandle = zs_malloc() zram_slot_lock zram_set_handle(handle) zram_slot_lock \t\t\t\tzram_slot_lock \t\t\t\tzram_set_handle(handle) \t\t\t\tzram_slot_lock  Either CPU0 or CPU1 zsmalloc handle will leak because zs_free() is done too early.  In fact, we need to reset zram entry right before we set its new handle, all under the same slot lock scope.",
  "published": "2025-10-04T08:15:47Z",
  "severity": "medium",
  "cvss": 4.7,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00101,
  "epssPercentile": 0.00879,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.9-1",
      "fix": "DEBIAN-CVE-2025-39941",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39941",
      "released": "2025-10-04T08:15:47Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}