{
  "cveId": "CVE-2026-53197",
  "url": "https://patchblox.com/security/cve/CVE-2026-53197",
  "summary": "CVE-2026-53197 is fixed in linux on 1 platform by DEBIAN-CVE-2026-53197 (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:  xfrm: iptfs: fix ABBA deadlock in iptfs_destroy_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  xfrm: iptfs: fix ABBA deadlock in iptfs_destroy_state()  iptfs_destroy_state() calls hrtimer_cancel() while holding a spinlock that the timer callback also acquires, leading to an ABBA deadlock on SMP systems.  For the output timer (iptfs_timer):   - iptfs_destroy_state() holds x-\u003Elock, calls hrtimer_cancel()   - iptfs_delay_timer() callback takes x-\u003Elock  For the drop timer (drop_timer):   - iptfs_destroy_state() holds drop_lock, calls hrtimer_cancel()   - iptfs_drop_timer() callback takes drop_lock  Both timers use HRTIMER_MODE_REL_SOFT, so their callbacks run in softirq context.  When hrtimer_cancel() is called for a soft timer that is currently executing on another CPU, hrtimer_cancel_wait_running() spins on softirq_expiry_lock -- the same lock held by the softirq running the callback.  If the callback is blocked waiting for the spinlock held by the caller of hrtimer_cancel(), a circular dependency forms:    CPU 0: holds lock_A -\u003E waits for softirq_expiry_lock   CPU 1: holds softirq_expiry_lock -\u003E waits for lock_A  Fix by calling hrtimer_cancel() before acquiring the respective locks. hrtimer_cancel() is safe to call without holding any lock and will wait for any in-progress callback to complete.  For the output timer, the lock is still acquired afterwards to drain the packet queue.  For the drop timer, the lock/unlock pair is removed entirely since it only existed to serialize with the timer callback, which hrtimer_cancel() already guarantees.  Found by source code audit.",
  "published": "2026-06-25T09:16:37Z",
  "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": 0.00124,
  "epssPercentile": 0.02118,
  "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-2026-53197",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-53197",
      "released": "2026-06-28T17:47:07Z"
    }
  ],
  "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"
  }
}