{
  "cveId": "CVE-2026-99249",
  "url": "https://patchblox.com/security/cve/CVE-2026-99249",
  "summary": "CVE-2026-99249 is fixed in linux on 1 platform by DEBIAN-CVE-2026-99249 (version 6.12.115-1), released November 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "pid_namespace: make zap_pid_ns_processes() freezable",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  pid_namespace: make zap_pid_ns_processes() freezable  When the init of a pid namespace exits, zap_pid_ns_processes() waits until all other pids in the namespace are freed. A tracer outside the namespace that does not reap its traced zombies keeps those pids allocated, so this wait has no upper bound, and while it lasts every suspend attempt fails:    Freezing user space processes failed after 20.006 seconds (2 tasks refusing to freeze, wq_busy=0):  Neither wait is freezable. The first loop sleeps in do_wait(), which returns -ERESTARTSYS on the freezer\u0027s fake signal; the loop then clears TIF_SIGPENDING and waits again without ever freezing. The final loop sleeps in TASK_INTERRUPTIBLE, and since nothing clears TIF_SIGPENDING there, schedule() returns immediately after the first freeze attempt and the task spins until the wait ends.  Sleep in TASK_INTERRUPTIBLE | TASK_FREEZABLE in do_wait(), so that the freezer can freeze tasks waiting there directly, and in TASK_IDLE | TASK_FREEZABLE in the final loop, like coredump_task_exit() does.  This was hit with Chromium-based browsers: crashpad ptrace-attaches the threads of a crashed renderer, which is a pid namespace init, and does not reap those killed during the dump.",
  "published": "2026-11-03T12:17:31Z",
  "severity": "Low",
  "cvss": 2.5,
  "epss": 0.00161,
  "epssPercentile": 0.05339,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99249",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-1",
      "fix": "DEBIAN-CVE-2026-99249",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-99249",
      "released": "2026-11-03T18:58:21Z"
    }
  ],
  "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"
  }
}