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
References
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
12 Jan 2026, 15:53
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/0b882f00655afefbc7729c6b5aec86f7a5473a3d - Patch | |
| References | () https://git.kernel.org/stable/c/38c0ea484dedb58cb3a4391229933e16be0d1031 - Patch | |
| References | () https://git.kernel.org/stable/c/68c4613e89f000e8198f9ace643082c697921c9f - Patch | |
| References | () https://git.kernel.org/stable/c/7f8fdd4dbffc05982b96caf586f77a014b2a9353 - Patch | |
| References | () https://git.kernel.org/stable/c/8e2739478c164147d0774802008528d9e03fb802 - Patch | |
| References | () https://git.kernel.org/stable/c/b8ca8e3f75ede308b4d49a6ca5081460be01bdb5 - Patch | |
| References | () https://git.kernel.org/stable/c/c826943abf473a3f7260fbadfad65e44db475460 - Patch | |
| References | () https://git.kernel.org/stable/c/cb7b3633ed749db8e56f475f43c960652cbd6882 - Patch | |
| References | () https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html - Third Party Advisory, Mailing List | |
| References | () https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html - Third Party Advisory, Mailing List | |
| CPE | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
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| CWE | NVD-CWE-noinfo | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux
Debian Debian debian Linux Linux linux Kernel |
03 Nov 2025, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
05 Sep 2025, 18:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-09-05 18:15
Updated : 2026-01-12 15:53
NVD link : CVE-2025-39724
Mitre link : CVE-2025-39724
CVE.ORG link : CVE-2025-39724
JSON object : View
Products Affected
debian
- debian_linux
linux
- linux_kernel
CWE