{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4b3faf610cc63bfac972711635eafbca5e7d7117"
            },
            {
              "fixed": "a13ca53e47e500854a3b9ec18b5dc83acfec863e"
            },
            {
              "fixed": "822b98d354e63e8249e85473c5f3c519f3c9cecc"
            },
            {
              "fixed": "c8a8a75b733467b00c08b91a38dbaf207a08ed6e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.14.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53197.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: iptfs: fix ABBA deadlock in iptfs_destroy_state()\n\niptfs_destroy_state() calls hrtimer_cancel() while holding a spinlock\nthat the timer callback also acquires, leading to an ABBA deadlock on\nSMP systems.\n\nFor the output timer (iptfs_timer):\n  - iptfs_destroy_state() holds x-\u003elock, calls hrtimer_cancel()\n  - iptfs_delay_timer() callback takes x-\u003elock\n\nFor the drop timer (drop_timer):\n  - iptfs_destroy_state() holds drop_lock, calls hrtimer_cancel()\n  - iptfs_drop_timer() callback takes drop_lock\n\nBoth timers use HRTIMER_MODE_REL_SOFT, so their callbacks run in softirq\ncontext.  When hrtimer_cancel() is called for a soft timer that is\ncurrently executing on another CPU, hrtimer_cancel_wait_running() spins\non softirq_expiry_lock -- the same lock held by the softirq running the\ncallback.  If the callback is blocked waiting for the spinlock held by\nthe caller of hrtimer_cancel(), a circular dependency forms:\n\n  CPU 0: holds lock_A -\u003e waits for softirq_expiry_lock\n  CPU 1: holds softirq_expiry_lock -\u003e waits for lock_A\n\nFix by calling hrtimer_cancel() before acquiring the respective locks.\nhrtimer_cancel() is safe to call without holding any lock and will wait\nfor any in-progress callback to complete.  For the output timer, the\nlock is still acquired afterwards to drain the packet queue.  For the\ndrop timer, the lock/unlock pair is removed entirely since it only\nexisted to serialize with the timer callback, which hrtimer_cancel()\nalready guarantees.\n\nFound by source code audit.",
  "id": "CVE-2026-53197",
  "modified": "2026-07-08T05:38:44.833648150Z",
  "published": "2026-06-25T08:39:06.991Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/822b98d354e63e8249e85473c5f3c519f3c9cecc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a13ca53e47e500854a3b9ec18b5dc83acfec863e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c8a8a75b733467b00c08b91a38dbaf207a08ed6e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53197.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53197"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "xfrm: iptfs: fix ABBA deadlock in iptfs_destroy_state()"
}