{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-21821",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-21821"
  ],
  "published": "2025-02-27T20:05:25Z",
  "summary": "fbdev: omap: use threaded IRQ for LCD DMA",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: omap: use threaded IRQ for LCD DMA\n\nWhen using touchscreen and framebuffer, Nokia 770 crashes easily with:\n\n    BUG: scheduling while atomic: irq/144-ads7846/82/0x00010000\n    Modules linked in: usb_f_ecm g_ether usb_f_rndis u_ether libcomposite configfs omap_udc ohci_omap ohci_hcd\n    CPU: 0 UID: 0 PID: 82 Comm: irq/144-ads7846 Not tainted 6.12.7-770 #2\n    Hardware name: Nokia 770\n    Call trace:\n     unwind_backtrace from show_stack+0x10/0x14\n     show_stack from dump_stack_lvl+0x54/0x5c\n     dump_stack_lvl from __schedule_bug+0x50/0x70\n     __schedule_bug from __schedule+0x4d4/0x5bc\n     __schedule from schedule+0x34/0xa0\n     schedule from schedule_preempt_disabled+0xc/0x10\n     schedule_preempt_disabled from __mutex_lock.constprop.0+0x218/0x3b4\n     __mutex_lock.constprop.0 from clk_prepare_lock+0x38/0xe4\n     clk_prepare_lock from clk_set_rate+0x18/0x154\n     clk_set_rate from sossi_read_data+0x4c/0x168\n     sossi_read_data from hwa742_read_reg+0x5c/0x8c\n     hwa742_read_reg from send_frame_handler+0xfc/0x300\n     send_frame_handler from process_pending_requests+0x74/0xd0\n     process_pending_requests from lcd_dma_irq_handler+0x50/0x74\n     lcd_dma_irq_handler from __handle_irq_event_percpu+0x44/0x130\n     __handle_irq_event_percpu from handle_irq_event+0x28/0x68\n     handle_irq_event from handle_level_irq+0x9c/0x170\n     handle_level_irq from generic_handle_domain_irq+0x2c/0x3c\n     generic_handle_domain_irq from omap1_handle_irq+0x40/0x8c\n     omap1_handle_irq from generic_handle_arch_irq+0x28/0x3c\n     generic_handle_arch_irq from call_with_stack+0x1c/0x24\n     call_with_stack from __irq_svc+0x94/0xa8\n    Exception stack(0xc5255da0 to 0xc5255de8)\n    5da0: 00000001 c22fc620 00000000 00000000 c08384a8 c106fc00 00000000 c240c248\n    5dc0: c113a600 c3f6ec30 00000001 00000000 c22fc620 c5255df0 c22fc620 c0279a94\n    5de0: 60000013 ffffffff\n     __irq_svc from clk_prepare_lock+0x4c/0xe4\n     clk_prepare_lock from clk_get_rate+0x10/0x74\n     clk_get_rate from uwire_setup_transfer+0x40/0x180\n     uwire_setup_transfer from spi_bitbang_transfer_one+0x2c/0x9c\n     spi_bitbang_transfer_one from spi_transfer_one_message+0x2d0/0x664\n     spi_transfer_one_message from __spi_pump_transfer_message+0x29c/0x498\n     __spi_pump_transfer_message from __spi_sync+0x1f8/0x2e8\n     __spi_sync from spi_sync+0x24/0x40\n     spi_sync from ads7846_halfd_read_state+0x5c/0x1c0\n     ads7846_halfd_read_state from ads7846_irq+0x58/0x348\n     ads7846_irq from irq_thread_fn+0x1c/0x78\n     irq_thread_fn from irq_thread+0x120/0x228\n     irq_thread from kthread+0xc8/0xe8\n     kthread from ret_from_fork+0x14/0x28\n\nAs a quick fix, switch to a threaded IRQ which provides a stable system.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.129",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-21821"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7bbbd311dd503653a2cc86d9226740883051dc92"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fb6a5edb60921887d7d10619fcdcbee9759552cb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aa8e22cbedeb626f2a6bda0aea362353d627cd0a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8392ea100f0b86c234c739c6662f39f0ccc0cefd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e4b6b665df815b4841e71b72f06446884e8aad40"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}