CVE-2026-74653— LPC32xx串口驱动FIFO溢出漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
以下是该漏洞描述信息的中文翻译： 在 Linux 内核中，已修复以下漏洞： serial: 8250_of: 清除 LPC32xx 上卡滞的空 FIFO RX 超时状态 NXP LPC32xx UART（PORT_LPC3220）会在 RX FIFO 为空时锁存（latch）一个 RX 字符超时中断：IIR 报告 UART_IIR_RX_TIMEOUT (0x0c)，但 LSR.DR 位为清除状态。只有读取 RHR 才能清除字符超时状态，但 仅在 LSR.DR 置位时才读取 RHR，因此该条件永远无法被清除。由于该
影响版本矩阵 8
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3ce24bc4d115336218e59b7e286fd3a79f4fc4c6 |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7795e8abedc86438cae0454602cbf9038b94bf38 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1423415471274abda87024967d7fe2206ceee0ea |
affected | ||
< 6.18.45 |
affected | ||
< 7.1.9 |
affected | ||
6.18.45≤ 6.18.* |
unaffected | ||
7.1.9≤ 7.1.* |
unaffected | ||
7.2≤ * |
unaffected |
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一、 漏洞 CVE-2026-74653 基础信息
漏洞信息
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Vulnerability Title
serial: 8250_of: clear stuck empty-FIFO RX-timeout on LPC32xx
来源: CVE Program / CVE List V5
Vulnerability 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's 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 ("serial: 8250_dw: Avoid "too much work" from bogus rx timeout interrupt")
which reports the identical iir=0xcc/lsr=0x60. See also
UART_RX_TIMEOUT_QUIRK in 8250_omap, and the note in 8250_bcm7271.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-74653 的公开POC
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CVE-2026-74653 补丁与修复 (3)
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| CVE-2026-74712 | 9.3 CRITICAL | mlx5 vdpa 在 create_direct_keys() 中缓冲区长度修复漏洞 |
| CVE-2026-74665 | 9.1 CRITICAL | NET skb长度计算通用XDP片段调整后修复 |
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IV. Related Vulnerabilities
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