CVE-2025-39724 (GCVE-0-2025-39724)
Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-10-15 01:08
VLAI
EPSS
VEX
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)
Assigner
References
12 references
Impacted products
6 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 | |
| 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 | |
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed |
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{
"lang": "en",
"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"
}
],
"id": "CVE-2025-39724",
"lastModified": "2026-10-19T21:10:00.160",
"metrics": {
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{
"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"
},
"exploitabilityScore": 1.8,
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"source": "nvd@nist.gov",
"type": "Primary"
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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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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.