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CVE-2025-39724serial: 8250: fix panic due to PSLVERR

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

Timeline

  1. ID reserved

    By Linux

  2. · 5 months later

    Published

  3. · 14 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-39724, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.18% · top 92% of all CVEs (14 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < 0b882f00655afefbc7729c6b5aec86f7a5473a3d
    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < b8ca8e3f75ede308b4d49a6ca5081460be01bdb5
    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < 68c4613e89f000e8198f9ace643082c697921c9f
    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < c826943abf473a3f7260fbadfad65e44db475460
    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < cb7b3633ed749db8e56f475f43c960652cbd6882
    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < 8e2739478c164147d0774802008528d9e03fb802
    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < 38c0ea484dedb58cb3a4391229933e16be0d1031
    • affected c49436b657d0a56a6ad90d14a7c3041add7cf64d – < 7f8fdd4dbffc05982b96caf586f77a014b2a9353
    • affected 6d5e79331417886196cb3a733bdb6645ba85bc42
    • affected 2401577586898b3590db80f8b97a26f81f0f6d4e
    • affected 3.10.48 – < 3.11
    • affected 3.12.24 – < 3.13

  • Linux · Linux

    • affected 3.13
    • unaffected < 3.13
    • unaffected 5.4.297 – ≤ 5.4.*
    • unaffected 5.10.241 – ≤ 5.10.*
    • unaffected 5.15.190 – ≤ 5.15.*
    • unaffected 6.1.149 – ≤ 6.1.*
    • unaffected 6.6.103 – ≤ 6.6.*
    • unaffected 6.12.44 – ≤ 6.12.*
    • unaffected 6.16.4 – ≤ 6.16.*
    • unaffected 6.17 – ≤ *

References

References12

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .