{
  "cveId": "CVE-2026-74653",
  "url": "https://patchblox.com/security/cve/CVE-2026-74653",
  "summary": "CVE-2026-74653 is fixed in 85 products on 1 platform, first by DEBIAN-CVE-2026-74653, released August 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "serial: 8250_of: clear stuck empty-FIFO RX-timeout on LPC32xx",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  serial: 8250_of: clear stuck empty-FIFO RX-timeout on LPC32xx  The NXP LPC32xx UART (PORT_LPC3220) can latch an RX character-timeout interrupt while the RX FIFO is empty: IIR reports UART_IIR_RX_TIMEOUT (0x0c) but LSR.DR is clear. A character timeout is only cleared by reading RHR, but serial8250_rx_chars() reads RHR only when LSR.DR is set, so nothing ever clears the condition. The interrupt is level-triggered and re-fires immediately, so on a single-core ARM926 the resulting interrupt storm livelocks the CPU.  It is reproducible when userspace repeatedly opens the front-panel port (ttyS1): serial8250_do_set_termios() re-enables interrupts on unlock and the handler then spins forever with iir=0xcc lsr=0x60 ier=0x05, tripping the soft-lockup detector in serial8250_handle_irq_locked().  LPC32xx has no dedicated 8250 glue driver, it\u0027s driven by the generic 8250_of. Add a hardware specific handle_irq for PORT_LPC3220, wired up in of_platform_serial_setup() the same way fsl8250_handle_irq is installed. The handler follows dw8250_handle_irq(): on an RX timeout with an empty FIFO (LSR.DR and LSR.BI clear) it does one throwaway RHR read to clear the condition, then calls serial8250_handle_irq_locked(). No real received data is ever discarded, and it is a no-op on healthy UARTs which never report a timeout with DR clear.  This is the same class of bug already worked around in other 8250 drivers; see commit 424d79183af0 (\u0022serial: 8250_dw: Avoid \u0022too much work\u0022 from bogus rx timeout interrupt\u0022) which reports the identical iir=0xcc/lsr=0x60. See also UART_RX_TIMEOUT_QUIRK in 8250_omap, and the note in 8250_bcm7271.",
  "published": "2026-08-22T16:16:38Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00168,
  "epssPercentile": 0.06096,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74653",
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