CVE-2025-39724serial: 8250: fix panic due to PSLVERR
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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
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Not yet received
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from c49436b657d0a56a6ad90d14a7c3041add7cf64d before 0b882f00655afefbc7729c6b5aec86f7a5473a3d; from c49436b657d0a56a6ad90d14a7c3041add7cf64d before b8ca8e3f75ede308b4d49a6ca5081460be01bdb5; from c49436b657d0a56a6ad90d14a7c3041add7cf64d before 68c4613e89f000e8198f9ace643082c697921c9f; from c49436b657d0a56a6ad90d14a7c3041add7cf64d before c826943abf473a3f7260fbadfad65e44db475460; from c49436b657d0a56a6ad90d14a7c3041add7cf64d before cb7b3633ed749db8e56f475f43c960652cbd6882; from c49436b657d0a56a6ad90d14a7c3041add7cf64d before 8e2739478c164147d0774802008528d9e03fb802; from c49436b657d0a56a6ad90d14a7c3041add7cf64d before 38c0ea484dedb58cb3a4391229933e16be0d1031; from c49436b657d0a56a6ad90d14a7c3041add7cf64d before 7f8fdd4dbffc05982b96caf586f77a014b2a9353; and 4 more ranges | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
References
- https://git.kernel.org/stable/c/0b882f00655afefbc7729c6b5aec86f7a5473a3d
- https://git.kernel.org/stable/c/b8ca8e3f75ede308b4d49a6ca5081460be01bdb5
- https://git.kernel.org/stable/c/68c4613e89f000e8198f9ace643082c697921c9f
- https://git.kernel.org/stable/c/c826943abf473a3f7260fbadfad65e44db475460
- https://git.kernel.org/stable/c/cb7b3633ed749db8e56f475f43c960652cbd6882
- https://git.kernel.org/stable/c/8e2739478c164147d0774802008528d9e03fb802
- https://git.kernel.org/stable/c/38c0ea484dedb58cb3a4391229933e16be0d1031
- https://git.kernel.org/stable/c/7f8fdd4dbffc05982b96caf586f77a014b2a9353
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.