{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43319",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-43319"
  ],
  "published": "2026-05-08T13:26:28Z",
  "summary": "spi: spidev: fix lock inversion between spi_lock and buf_lock",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: spidev: fix lock inversion between spi_lock and buf_lock\n\nThe spidev driver previously used two mutexes, spi_lock and buf_lock,\nbut acquired them in different orders depending on the code path:\n\n  write()/read(): buf_lock -> spi_lock\n  ioctl():       spi_lock -> buf_lock\n\nThis AB-BA locking pattern triggers lockdep warnings and can\ncause real deadlocks:\n\n  WARNING: possible circular locking dependency detected\n  spidev_ioctl() -> mutex_lock(&spidev->buf_lock)\n  spidev_sync_write() -> mutex_lock(&spidev->spi_lock)\n  *** DEADLOCK ***\n\nThe issue is reproducible with a simple userspace program that\nperforms write() and SPI_IOC_WR_MAX_SPEED_HZ ioctl() calls from\nseparate threads on the same spidev file descriptor.\n\nFix this by simplifying the locking model and removing the lock\ninversion entirely. spidev_sync() no longer performs any locking,\nand all callers serialize access using spi_lock.\n\nbuf_lock is removed since its functionality is fully covered by\nspi_lock, eliminating the possibility of lock ordering issues.\n\nThis removes the lock inversion and prevents deadlocks without\nchanging userspace ABI or behaviour.",
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