{
  "cveId": "CVE-2026-53243",
  "url": "https://patchblox.com/security/cve/CVE-2026-53243",
  "summary": "CVE-2026-53243 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53243 (version 7.0.13-1), released June 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  rseq: Fix using an uninitialized stack variable...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  rseq: Fix using an uninitialized stack variable in rseq_exit_user_update()  There is an bug in which an uninitialized stack variable is used in rseq_exit_user_update() as reported by syzbot:  BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline]  The local variable:  \tstruct rseq_ids ids = { \t\t.cpu_id\t = task_cpu(t), \t\t.mm_cid\t = task_mm_cid(t), \t\t.node_id = cpu_to_node(ids.cpu_id), \t};  According to the C standard, the evaluation order of expressions in an initializer list is indeterminately sequenced. The compiler (Clang, in this KMSAN build) evaluates \u0060cpu_to_node(ids.cpu_id)\u0060 *before* \u0060ids.cpu_id\u0060 is initialized with \u0060task_cpu(t)\u0060.  This is fixed by moving the assignment of ids.node_id outside the structure initialization.",
  "published": "2026-06-25T09:16:42Z",
  "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": 0.00143,
  "epssPercentile": 0.03661,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.13-1",
      "fix": "DEBIAN-CVE-2026-53243",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53243",
      "released": "2026-06-28T17:47:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}