xfrm: iptfs: fix ABBA deadlock in iptfs_destroy_state()

{
  "id": "4e14fc885d396c164e5f26282d49e4142fd39ee713f964371bd9a2ea5a88855c",
  "url": "https://osv.dev/vulnerability/CVE-2026-53197",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfrm: iptfs: fix ABBA deadlock in iptfs_destroy_state()",
    "summary": "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->lock, calls hrtimer_cancel() - iptfs_delay_timer() callback takes x->lock 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 -> waits for softirq_expiry_lock CPU 1: holds softirq_expiry_lock -> 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() a",
    "evidence": "osv:CVE-2026-53197",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53197",
      "aliases": [
        "CVE-2026-53197"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4b3faf610cc63bfac972711635eafbca5e7d7117"
                },
                {
                  "fixed": "a13ca53e47e500854a3b9ec18b5dc83acfec863e"
                },
                {
                  "fixed": "822b98d354e63e8249e85473c5f3c519f3c9cecc"
                },
                {
                  "fixed": "c8a8a75b733467b00c08b91a38dbaf207a08ed6e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53197.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.18.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.13"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53197.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:34.166105573Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/822b98d354e63e8249e85473c5f3c519f3c9cecc",
        "https://git.kernel.org/stable/c/a13ca53e47e500854a3b9ec18b5dc83acfec863e",
        "https://git.kernel.org/stable/c/c8a8a75b733467b00c08b91a38dbaf207a08ed6e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53197.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53197",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53197.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53197",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 501277,
  "published_at": "2026-06-25T08:39:06.991+00:00"
}