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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-39724 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: serial: 8250: fix panic due to PSLVERR When the PSLVERR_RESP_EN parameter is set to 1, the device generates an error response if an attempt is made to read an empty RBR (Receive Buffer Register) while the FIFO is enabled. In serial8250_do_startup(), calling serial_port_out(port, UART_LCR, UART_LCR_WLEN8) triggers dw8250_check_lcr(), which invokes dw8250_force_idle() and serial8250_clear_and_reinit_fifos(). The latter function enables the FIFO via serial_out(p, UART_FCR, p->fcr). Execution proceeds to the serial_port_in(port, UART_RX). This satisfies the PSLVERR trigger condition. When another CPU (e.g., using printk()) is accessing the UART (UART is busy), the current CPU fails the check (value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR) in dw8250_check_lcr(), causing it to enter dw8250_force_idle(). Put serial_port_out(port, UART_LCR, UART_LCR_WLEN8) under the port->lock to fix this issue. Panic backtrace: [ 0.442336] Oops - unknown exception [#1] [ 0.442343] epc : dw8250_serial_in32+0x1e/0x4a [ 0.442351] ra : serial8250_do_startup+0x2c8/0x88e ... [ 0.442416] console_on_rootfs+0x26/0x70


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
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References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/0b882f00655afefbc7729c6b5aec86f7a5473a3d kernel.org Patch 
https://git.kernel.org/stable/c/38c0ea484dedb58cb3a4391229933e16be0d1031 kernel.org Patch 
https://git.kernel.org/stable/c/68c4613e89f000e8198f9ace643082c697921c9f kernel.org Patch 
https://git.kernel.org/stable/c/7f8fdd4dbffc05982b96caf586f77a014b2a9353 kernel.org Patch 
https://git.kernel.org/stable/c/8e2739478c164147d0774802008528d9e03fb802 kernel.org Patch 
https://git.kernel.org/stable/c/b8ca8e3f75ede308b4d49a6ca5081460be01bdb5 kernel.org Patch 
https://git.kernel.org/stable/c/c826943abf473a3f7260fbadfad65e44db475460 kernel.org Patch 
https://git.kernel.org/stable/c/cb7b3633ed749db8e56f475f43c960652cbd6882 kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html CVE Mailing List  Third Party Advisory 
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html CVE Mailing List  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-39724
NVD Published Date:
09/05/2025
NVD Last Modified:
01/12/2026
Source:
kernel.org