CVE-2025-39724

Summary

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < 0b882f00655afefbc7729c6b5aec86f7a5473a3daffected
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < b8ca8e3f75ede308b4d49a6ca5081460be01bdb5affected
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < 68c4613e89f000e8198f9ace643082c697921c9faffected
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < c826943abf473a3f7260fbadfad65e44db475460affected
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < cb7b3633ed749db8e56f475f43c960652cbd6882affected
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < 8e2739478c164147d0774802008528d9e03fb802affected
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < 38c0ea484dedb58cb3a4391229933e16be0d1031affected
LinuxLinuxc49436b657d0a56a6ad90d14a7c3041add7cf64d < 7f8fdd4dbffc05982b96caf586f77a014b2a9353affected
LinuxLinux6d5e79331417886196cb3a733bdb6645ba85bc42affected
LinuxLinux2401577586898b3590db80f8b97a26f81f0f6d4eaffected
LinuxLinux3.10.48 < 3.11affected
LinuxLinux3.12.24 < 3.13affected
LinuxLinux3.13affected
LinuxLinux0 < 3.13unaffected
LinuxLinux5.4.297 <= 5.4.*unaffected
LinuxLinux5.10.241 <= 5.10.*unaffected
LinuxLinux5.15.190 <= 5.15.*unaffected
LinuxLinux6.1.149 <= 6.1.*unaffected
LinuxLinux6.6.103 <= 6.6.*unaffected
LinuxLinux6.12.44 <= 6.12.*unaffected
LinuxLinux6.16.4 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

Additional References

References