Answer in brief
CVE-2025-39724 records a Medium severity (CVSS 5.5) vulnerability in serial: 8250: fix panic due to PSLVERR. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC CN 4100 (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <0b882f00655afefbc7729c6b5aec86f7a5473a3d || >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <b8ca8e3f75ede308b4d49a6ca5081460be01bdb5 || >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <68c4613e89f000e8198f9ace643082c697921c9f || >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <c826943abf473a3f7260fbadfad65e44db475460 || >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <cb7b3633ed749db8e56f475f43c960652cbd6882 || >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <8e2739478c164147d0774802008528d9e03fb802 || >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <38c0ea484dedb58cb3a4391229933e16be0d1031 || >=c49436b657d0a56a6ad90d14a7c3041add7cf64d <7f8fdd4dbffc05982b96caf586f77a014b2a9353 || 6d5e79331417886196cb3a733bdb6645ba85bc42 || 2401577586898b3590db80f8b97a26f81f0f6d4e || >=3.10.48 <3.11 || >=3.12.24 <3.13 | 0b882f00655afefbc7729c6b5aec86f7a5473a3d, b8ca8e3f75ede308b4d49a6ca5081460be01bdb5, 68c4613e89f000e8198f9ace643082c697921c9f, c826943abf473a3f7260fbadfad65e44db475460, cb7b3633ed749db8e56f475f43c960652cbd6882, 8e2739478c164147d0774802008528d9e03fb802, 38c0ea484dedb58cb3a4391229933e16be0d1031, 7f8fdd4dbffc05982b96caf586f77a014b2a9353, 3.11, 3.13 |
| Linux/Linuxgeneric | 3.13 | Not reported |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Sep 5, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
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
Quoted source text, attributed separately from HOL analysis.