{
  "cveId": "CVE-2026-53331",
  "url": "https://patchblox.com/security/cve/CVE-2026-53331",
  "summary": "CVE-2026-53331 is fixed in 16 products on 1 platform, first by DEBIAN-CVE-2026-53331, released July 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ct...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl-\u003Elock  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 (\u0026ctrl-\u003Elock){\u002B.\u002B.}-{4:4}, at: slim_report_absent (drivers/slimbus/core.c:322) slimbus    but task is already holding lock:   ffff00009793fb50 (\u0026ctrl-\u003Etx_lock){\u002B.\u002B.}-{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(\u0026ctrl-\u003Etx_lock);                                 lock(\u0026ctrl-\u003Elock);                                 lock(\u0026ctrl-\u003Etx_lock);    lock(\u0026ctrl-\u003Elock);  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_notify() to avoid the deadlock.",
  "published": "2026-07-01T14:16:40Z",
  "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": 0.00129,
  "epssPercentile": 0.02606,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.78.1",
      "fix": "SUSE-SU-2026:3790-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-3790-1",
      "released": "2026-08-25T12:24:44Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "SUSE-SU-2026:23231-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23231-1",
      "released": "2026-08-11T21:26:34Z"
    },
    {
      "platform": "linux",
      "product": "kernel-azure",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.37.1",
      "fix": "OPENSUSE-SU-2026:21555-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21555-1",
      "released": "2026-08-12T01:09:28Z"
    },
    {
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      "release": "sles 15.7",
      "fixedVersion": "6.4.0-150700.53.78.1",
      "fix": "SUSE-SU-2026:3790-1",
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      "released": "2026-08-25T12:24:44Z"
    },
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      "fix": "SUSE-SU-2026:23231-1",
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    },
    {
      "platform": "linux",
      "product": "kernel-default",
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      "fix": "OPENSUSE-SU-2026:21555-1",
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      "released": "2026-08-12T01:09:28Z"
    },
    {
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    },
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      "fix": "SUSE-SU-2026:23237-1",
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      "released": "2026-08-11T21:34:22Z"
    },
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      "fix": "OPENSUSE-SU-2026:21555-1",
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      "fix": "SUSE-SU-2026:3790-1",
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      "released": "2026-08-25T12:24:44Z"
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      "product": "kernel-kvmsmall",
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  ],
  "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"
  }
}