CVE-2026-53197 (GCVE-0-2026-53197)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
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() already guarantees. Found by source code audit.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4b3faf610cc63bfac972711635eafbca5e7d7117 , < a13ca53e47e500854a3b9ec18b5dc83acfec863e (git)
Affected: 4b3faf610cc63bfac972711635eafbca5e7d7117 , < 822b98d354e63e8249e85473c5f3c519f3c9cecc (git)
Affected: 4b3faf610cc63bfac972711635eafbca5e7d7117 , < c8a8a75b733467b00c08b91a38dbaf207a08ed6e (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_iptfs.c"
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          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.14"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1",
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                  "versionStartIncluding": "6.14",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
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                  "vulnerable": true
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:06.991Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a13ca53e47e500854a3b9ec18b5dc83acfec863e"
        },
        {
          "url": "https://git.kernel.org/stable/c/822b98d354e63e8249e85473c5f3c519f3c9cecc"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8a8a75b733467b00c08b91a38dbaf207a08ed6e"
        }
      ],
      "title": "xfrm: iptfs: fix ABBA deadlock in iptfs_destroy_state()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53197",
    "datePublished": "2026-06-25T08:39:06.991Z",
    "dateReserved": "2026-06-09T07:44:35.391Z",
    "dateUpdated": "2026-06-25T08:39:06.991Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53197",
      "date": "2026-07-02",
      "epss": "0.00173",
      "percentile": "0.07013"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53197\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-25T09:16:37.227\",\"lastModified\":\"2026-06-30T14:44:27.313\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/xfrm/xfrm_iptfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4b3faf610cc63bfac972711635eafbca5e7d7117\",\"lessThan\":\"a13ca53e47e500854a3b9ec18b5dc83acfec863e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4b3faf610cc63bfac972711635eafbca5e7d7117\",\"lessThan\":\"822b98d354e63e8249e85473c5f3c519f3c9cecc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4b3faf610cc63bfac972711635eafbca5e7d7117\",\"lessThan\":\"c8a8a75b733467b00c08b91a38dbaf207a08ed6e\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/xfrm/xfrm_iptfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/822b98d354e63e8249e85473c5f3c519f3c9cecc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a13ca53e47e500854a3b9ec18b5dc83acfec863e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8a8a75b733467b00c08b91a38dbaf207a08ed6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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