CVE-2025-39724 (GCVE-0-2025-39724)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-10-15 01:08
VLAI
Title
serial: 8250: fix panic due to PSLVERR
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
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 0b882f00655afefbc7729c6b5aec86f7a5473a3d (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < b8ca8e3f75ede308b4d49a6ca5081460be01bdb5 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 68c4613e89f000e8198f9ace643082c697921c9f (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < c826943abf473a3f7260fbadfad65e44db475460 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < cb7b3633ed749db8e56f475f43c960652cbd6882 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 8e2739478c164147d0774802008528d9e03fb802 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 38c0ea484dedb58cb3a4391229933e16be0d1031 (git)
Affected: c49436b657d0a56a6ad90d14a7c3041add7cf64d , < 7f8fdd4dbffc05982b96caf586f77a014b2a9353 (git)
Affected: 6d5e79331417886196cb3a733bdb6645ba85bc42 (git)
Affected: 2401577586898b3590db80f8b97a26f81f0f6d4e (git)
Affected: 3.10.48 , < 3.11 (semver)
Affected: 3.12.24 , < 3.13 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nserial: 8250: fix panic due to PSLVERR\n\nWhen the PSLVERR_RESP_EN parameter is set to 1, the device generates\nan error response if an attempt is made to read an empty RBR (Receive\nBuffer Register) while the FIFO is enabled.\n\nIn serial8250_do_startup(), calling serial_port_out(port, UART_LCR,\nUART_LCR_WLEN8) triggers dw8250_check_lcr(), which invokes\ndw8250_force_idle() and serial8250_clear_and_reinit_fifos(). The latter\nfunction enables the FIFO via serial_out(p, UART_FCR, p-\u003efcr).\nExecution proceeds to the serial_port_in(port, UART_RX).\nThis satisfies the PSLVERR trigger condition.\n\nWhen another CPU (e.g., using printk()) is accessing the UART (UART\nis busy), the current CPU fails the check (value \u0026 ~UART_LCR_SPAR) ==\n(lcr \u0026 ~UART_LCR_SPAR) in dw8250_check_lcr(), causing it to enter\ndw8250_force_idle().\n\nPut serial_port_out(port, UART_LCR, UART_LCR_WLEN8) under the port-\u003elock\nto fix this issue.\n\nPanic backtrace:\n[    0.442336] Oops - unknown exception [#1]\n[    0.442343] epc : dw8250_serial_in32+0x1e/0x4a\n[    0.442351]  ra : serial8250_do_startup+0x2c8/0x88e\n...\n[    0.442416] console_on_rootfs+0x26/0x70"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nserial: 8250: correcci\u00f3n de p\u00e1nico debido a PSLVERR\n\nCuando el par\u00e1metro PSLVERR_RESP_EN se establece en 1, el dispositivo genera una respuesta de error si se intenta leer un RBR (Receive Buffer Register) vac\u00edo mientras el FIFO est\u00e1 habilitado.\n\nEn serial8250_do_startup(), la llamada a serial_port_out(port, UART_LCR, UART_LCR_WLEN8) activa dw8250_check_lcr(), que invoca dw8250_force_idle() y serial8250_clear_and_reinit_fifos(). Esta \u00faltima funci\u00f3n habilita el FIFO a trav\u00e9s de serial_out(p, UART_FCR, p-\u003efcr). La ejecuci\u00f3n contin\u00faa hasta el serial_port_in(port, UART_RX). Esto satisface la condici\u00f3n de activaci\u00f3n de PSLVERR.\n\nCuando otra CPU (por ejemplo, usando printk()) est\u00e1 accediendo a la UART (la UART est\u00e1 ocupada), la CPU actual falla la verificaci\u00f3n (value \u0026 ~UART_LCR_SPAR) == (lcr \u0026 ~UART_LCR_SPAR) en dw8250_check_lcr(), lo que hace que entre en dw8250_force_idle().\n\nColocar serial_port_out(port, UART_LCR, UART_LCR_WLEN8) bajo el port-\u003elock para solucionar este problema.\n\nRastreo de p\u00e1nico:\n[    0.442336] Oops - excepci\u00f3n desconocida [#1]\n[    0.442343] epc : dw8250_serial_in32+0x1e/0x4a\n[    0.442351]  ra : serial8250_do_startup+0x2c8/0x88e\n...\n[    0.442416] console_on_rootfs+0x26/0x70"
          }
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        "id": "CVE-2025-39724",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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    "redhat_vex": {
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      "current_release_date": "2026-06-30T10:22:33+00:00",
      "cve": "CVE-2025-39724",
      "id": "CVE-2025-39724",
      "initial_release_date": "2025-09-05T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: serial: 8250: fix panic due to PSLVERR",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39724.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-10-15T16:34:15Z",
      "cve": "CVE-2025-39724",
      "id": "CVE-2025-39724",
      "initial_release_date": "2025-09-08T23:22:10Z",
      "product_status:known_affected": "720",
      "product_status:known_not_affected": "11",
      "product_status:recommended": "532",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39724",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-39724.json",
      "version": "56"
    }
  }
}



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