slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl->lock

{
  "id": "9e514d5c18179f93525b9979445026ffccd94208a507cc930c5f0952bfdbd891",
  "url": "https://osv.dev/vulnerability/CVE-2026-53331",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl->lock",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl->lock During the SSR/PDR down notification the tx_lock is taken with the intent to provide synchronization with active DMA transfers. But during this period qcom_slim_ngd_down() is invoked, which ends up in slim_report_absent(), which takes the slim_controller lock. In multiple other codepaths these two locks are taken in the opposite order (i.e. slim_controller then tx_lock). The result is a lockdep splat, and a possible deadlock: rprocctl/449 is trying to acquire lock: ffff00009793e620 (&ctrl->lock){+.+.}-{4:4}, at: slim_report_absent (drivers/slimbus/core.c:322) slimbus but task is already holding lock: ffff00009793fb50 (&ctrl->tx_lock){+.+.}-{4:4}, at: qcom_slim_ngd_ssr_pdr_notify (drivers/slimbus/qcom-ngd-ctrl.c:1475) slim_qcom_ngd_ctrl which lock already depends on the new lock. Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ctrl->tx_lock); lock(&ctrl->lock); lock(&ctrl->tx_lock); lock(&ctrl->lock); The assumption is that the comment refers to the desire to not call qcom_slim_ngd_exit_dma() while we have an ongoing DMA TX transaction. But any such transaction is initiated and completed within a single qcom_slim_ngd_xfer_msg(). Prior to calling qcom_slim_ngd_exit_dma() the slim_controller is torn down, all child devices are notified that the slimbus is gone and the child devices are removed. Stop taking the tx_lock in qcom_slim_ngd_ssr_pdr_n",
    "evidence": "osv:CVE-2026-53331",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53331",
      "aliases": [
        "CVE-2026-53331"
      ],
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      "modified": "2026-10-28T02:30:22.885314897Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3d1561537237c6cc1db76155183d8bbdac2339f0",
        "https://git.kernel.org/stable/c/55f2ea9ff83cc27a85526b14bc9b32f96a08d6ec",
        "https://git.kernel.org/stable/c/9708eb50fd7343145b422be852f890212155d845",
        "https://git.kernel.org/stable/c/9f0d45d509b434c54da10e01f4ef8086e4583401",
        "https://git.kernel.org/stable/c/aad4337a21b9ad3ae8d668fa8678d05e26ecbaa8",
        "https://git.kernel.org/stable/c/d54a221b0f3cd9e1f03f18104be34e02a8258fae",
        "https://git.kernel.org/stable/c/dc4d5c57e012c2c669793deb1515a57bbc6bf5dd",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53331.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53331",
        "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-2026-53331.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2026-53331",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 488911,
  "published_at": "2026-07-01T13:32:15.733+00:00"
}