CVE-2024-26806 (GCVE-0-2024-26806)

Vulnerability from cvelistv5 – Published: 2024-04-04 08:20 – Updated: 2026-05-11 20:04
VLAI
Title
spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks
Summary
In the Linux kernel, the following vulnerability has been resolved: spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks The ->runtime_suspend() and ->runtime_resume() callbacks are not expected to call spi_controller_suspend() and spi_controller_resume(). Remove calls to those in the cadence-qspi driver. Those helpers have two roles currently: - They stop/start the queue, including dealing with the kworker. - They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It requires acquiring ctlr->bus_lock_mutex. Step one is irrelevant because cadence-qspi is not queued. Step two however has two implications: - A deadlock occurs, because ->runtime_resume() is called in a context where the lock is already taken (in the ->exec_op() callback, where the usage count is incremented). - It would disallow all operations once the device is auto-suspended. Here is a brief call tree highlighting the mutex deadlock: spi_mem_exec_op() ... spi_mem_access_start() mutex_lock(&ctlr->bus_lock_mutex) cqspi_exec_mem_op() pm_runtime_resume_and_get() cqspi_resume() spi_controller_resume() mutex_lock(&ctlr->bus_lock_mutex) ... spi_mem_access_end() mutex_unlock(&ctlr->bus_lock_mutex) ...
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-05 17:28 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0578a6dbfe7514db7134501cf93acc21cf13e479 , < 041562ebc4759c9932b59a06527f8753b86da365 (git)
Affected: 0578a6dbfe7514db7134501cf93acc21cf13e479 , < 959043afe53ae80633e810416cee6076da6e91c6 (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.7.9 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks\n\nThe -\u003eruntime_suspend() and -\u003eruntime_resume() callbacks are not\nexpected to call spi_controller_suspend() and spi_controller_resume().\nRemove calls to those in the cadence-qspi driver.\n\nThose helpers have two roles currently:\n - They stop/start the queue, including dealing with the kworker.\n - They toggle the SPI controller SPI_CONTROLLER_SUSPENDED flag. It\n   requires acquiring ctlr-\u003ebus_lock_mutex.\n\nStep one is irrelevant because cadence-qspi is not queued. Step two\nhowever has two implications:\n - A deadlock occurs, because -\u003eruntime_resume() is called in a context\n   where the lock is already taken (in the -\u003eexec_op() callback, where\n   the usage count is incremented).\n - It would disallow all operations once the device is auto-suspended.\n\nHere is a brief call tree highlighting the mutex deadlock:\n\nspi_mem_exec_op()\n        ...\n        spi_mem_access_start()\n                mutex_lock(\u0026ctlr-\u003ebus_lock_mutex)\n\n        cqspi_exec_mem_op()\n                pm_runtime_resume_and_get()\n                        cqspi_resume()\n                                spi_controller_resume()\n                                        mutex_lock(\u0026ctlr-\u003ebus_lock_mutex)\n                ...\n\n        spi_mem_access_end()\n                mutex_unlock(\u0026ctlr-\u003ebus_lock_mutex)\n        ..."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:04:31.914Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/041562ebc4759c9932b59a06527f8753b86da365"
            },
            {
              "url": "https://git.kernel.org/stable/c/959043afe53ae80633e810416cee6076da6e91c6"
            }
          ],
          "title": "spi: cadence-qspi: remove system-wide suspend helper calls from runtime PM hooks",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-26806",
        "datePublished": "2024-04-04T08:20:33.512Z",
        "dateReserved": "2024-02-19T14:20:24.179Z",
        "dateUpdated": "2026-05-11T20:04:31.914Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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