{
  "cveId": "CVE-2025-68262",
  "url": "https://patchblox.com/security/cve/CVE-2025-68262",
  "summary": "CVE-2025-68262 is fixed in linux on 1 platform by DEBIAN-CVE-2025-68262 (version 6.17.12-1), released December 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  crypto: zstd - fix double-free in per-CPU stream...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  crypto: zstd - fix double-free in per-CPU stream cleanup  The crypto/zstd module has a double-free bug that occurs when multiple tfms are allocated and freed.  The issue happens because zstd_streams (per-CPU contexts) are freed in zstd_exit() during every tfm destruction, rather than being managed at the module level.  When multiple tfms exist, each tfm exit attempts to free the same shared per-CPU streams, resulting in a double-free.  This leads to a stack trace similar to:    BUG: Bad page state in process kworker/u16:1  pfn:106fd93   page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106fd93   flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)   page_type: 0xffffffff()   raw: 0017ffffc0000000 dead000000000100 dead000000000122 0000000000000000   raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000   page dumped because: nonzero entire_mapcount   Modules linked in: ...   CPU: 3 UID: 0 PID: 2506 Comm: kworker/u16:1 Kdump: loaded Tainted: G    B   Hardware name: ...   Workqueue: btrfs-delalloc btrfs_work_helper   Call Trace:    \u003CTASK\u003E    dump_stack_lvl\u002B0x5d/0x80    bad_page\u002B0x71/0xd0    free_unref_page_prepare\u002B0x24e/0x490    free_unref_page\u002B0x60/0x170    crypto_acomp_free_streams\u002B0x5d/0xc0    crypto_acomp_exit_tfm\u002B0x23/0x50    crypto_destroy_tfm\u002B0x60/0xc0    ...  Change the lifecycle management of zstd_streams to free the streams only once during module cleanup.",
  "published": "2025-12-16T15:15:55Z",
  "severity": "",
  "epss": 0.00184,
  "epssPercentile": 0.08008,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.12-1",
      "fix": "DEBIAN-CVE-2025-68262",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-68262",
      "released": "2025-12-16T15:15:55Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}