CVE-2026-53331 (GCVE-0-2026-53331)

Vulnerability from cvelistv5 – Published: 2026-07-01 13:32 – Updated: 2026-07-01 13:32
VLAI
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_notify() to avoid the deadlock.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 3d1561537237c6cc1db76155183d8bbdac2339f0 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < dc4d5c57e012c2c669793deb1515a57bbc6bf5dd (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < d54a221b0f3cd9e1f03f18104be34e02a8258fae (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < aad4337a21b9ad3ae8d668fa8678d05e26ecbaa8 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 9f0d45d509b434c54da10e01f4ef8086e4583401 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 9708eb50fd7343145b422be852f890212155d845 (git)
Affected: a899d324863a3d15ce0eea513884e1b73a758c58 , < 55f2ea9ff83cc27a85526b14bc9b32f96a08d6ec (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl-\u003elock\n\nDuring the SSR/PDR down notification the tx_lock is taken with the\nintent to provide synchronization with active DMA transfers.\n\nBut during this period qcom_slim_ngd_down() is invoked, which ends up in\nslim_report_absent(), which takes the slim_controller lock. In multiple\nother codepaths these two locks are taken in the opposite order (i.e.\nslim_controller then tx_lock).\n\nThe result is a lockdep splat, and a possible deadlock:\n\n  rprocctl/449 is trying to acquire lock:\n  ffff00009793e620 (\u0026ctrl-\u003elock){+.+.}-{4:4}, at: slim_report_absent (drivers/slimbus/core.c:322) slimbus\n\n  but task is already holding lock:\n  ffff00009793fb50 (\u0026ctrl-\u003etx_lock){+.+.}-{4:4}, at: qcom_slim_ngd_ssr_pdr_notify (drivers/slimbus/qcom-ngd-ctrl.c:1475) slim_qcom_ngd_ctrl\n\n  which lock already depends on the new lock.\n\n  Possible unsafe locking scenario:\n\n        CPU0                    CPU1\n        ----                    ----\n   lock(\u0026ctrl-\u003etx_lock);\n                                lock(\u0026ctrl-\u003elock);\n                                lock(\u0026ctrl-\u003etx_lock);\n   lock(\u0026ctrl-\u003elock);\n\nThe assumption is that the comment refers to the desire to not call\nqcom_slim_ngd_exit_dma() while we have an ongoing DMA TX transaction.\nBut any such transaction is initiated and completed within a single\nqcom_slim_ngd_xfer_msg().\n\nPrior to calling qcom_slim_ngd_exit_dma() the slim_controller is torn\ndown, all child devices are notified that the slimbus is gone and the\nchild devices are removed.\n\nStop taking the tx_lock in qcom_slim_ngd_ssr_pdr_notify() to avoid the\ndeadlock."
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In multiple\\nother codepaths these two locks are taken in the opposite order (i.e.\\nslim_controller then tx_lock).\\n\\nThe result is a lockdep splat, and a possible deadlock:\\n\\n  rprocctl/449 is trying to acquire lock:\\n  ffff00009793e620 (\u0026ctrl-\u003elock){+.+.}-{4:4}, at: slim_report_absent (drivers/slimbus/core.c:322) slimbus\\n\\n  but task is already holding lock:\\n  ffff00009793fb50 (\u0026ctrl-\u003etx_lock){+.+.}-{4:4}, at: qcom_slim_ngd_ssr_pdr_notify (drivers/slimbus/qcom-ngd-ctrl.c:1475) slim_qcom_ngd_ctrl\\n\\n  which lock already depends on the new lock.\\n\\n  Possible unsafe locking scenario:\\n\\n        CPU0                    CPU1\\n        ----                    ----\\n   lock(\u0026ctrl-\u003etx_lock);\\n                                lock(\u0026ctrl-\u003elock);\\n                                lock(\u0026ctrl-\u003etx_lock);\\n   lock(\u0026ctrl-\u003elock);\\n\\nThe assumption is that the comment refers to the desire to not call\\nqcom_slim_ngd_exit_dma() while we have an ongoing DMA TX transaction.\\nBut any such transaction is initiated and completed within a single\\nqcom_slim_ngd_xfer_msg().\\n\\nPrior to calling qcom_slim_ngd_exit_dma() the slim_controller is torn\\ndown, all child devices are notified that the slimbus is gone and the\\nchild devices are removed.\\n\\nStop taking the tx_lock in qcom_slim_ngd_ssr_pdr_notify() to avoid 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-01T16:50:31+00:00",
      "cve": "CVE-2026-53331",
      "id": "CVE-2026-53331",
      "initial_release_date": "2026-07-01T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: slimbus: qcom-ngd-ctrl: Avoid ABBA on tx_lock/ctrl-\u003elock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53331.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:03:56Z",
      "cve": "CVE-2026-53331",
      "id": "CVE-2026-53331",
      "initial_release_date": "2026-07-03T03:04:27Z",
      "product_status:known_affected": "185",
      "product_status:known_not_affected": "94",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53331",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53331.json",
      "version": "3"
    }
  }
}



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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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.