CVE-2025-21704

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21704
In the Linux kernel, the following vulnerability has been resolved: usb: cdc-acm: Check control transfer buffer size before access If the first fragment is shorter than struct usb_cdc_notification, we can't calculate an expected_size. Log an error and discard the notification instead of reading lengths from memory outside the received data, which can lead to memory corruption when the expected_size decreases between fragments, causing `expected_size - acm->nb_index` to wrap. This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 ("cdc-acm: reassemble fragmented notifications"). A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB device's vendor/product IDs and its other interfaces.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831 Patch
https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c Patch
https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646 Patch
https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812 Patch
https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118 Patch
https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 Patch
https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01 Patch
https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636 Patch
https://project-zero.issues.chromium.org/issues/395107243 Exploit Issue Tracking Third Party Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
History

23 Sep 2025, 19:14

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831 - () https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831 - Patch
References () https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c - () https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c - Patch
References () https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646 - () https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646 - Patch
References () https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812 - () https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812 - Patch
References () https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118 - () https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118 - Patch
References () https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 - () https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 - Patch
References () https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01 - () https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01 - Patch
References () https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636 - () https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636 - Patch
References () https://project-zero.issues.chromium.org/issues/395107243 - () https://project-zero.issues.chromium.org/issues/395107243 - Exploit, Issue Tracking, Third Party Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
CWE CWE-787
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:*
First Time Linux
Linux linux Kernel

25 Mar 2025, 13:15

Type Values Removed Values Added
References
  • () https://project-zero.issues.chromium.org/issues/395107243 -

13 Mar 2025, 13:15

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: cdc-acm: Verificar el tamaño del búfer de transferencia de control antes del acceso Si el primer fragmento es más corto que struct usb_cdc_notification, no podemos calcular un expected_size. Registra un error y descarta la notificación en lugar de leer longitudes de la memoria fuera de los datos recibidos, lo que puede provocar una corrupción de la memoria cuando el expected_size disminuye entre fragmentos, lo que hace que `expected_size - acm->nb_index` se ajuste. Este problema ha estado presente desde el comienzo de la historia de git; sin embargo, solo conduce a la corrupción de la memoria desde el commit ea2583529cd1 ("cdc-acm: reensamblar notificaciones fragmentadas"). Un factor atenuante es que acm_ctrl_irq() solo se puede ejecutar después de que el espacio de usuario haya abierto /dev/ttyACM*; pero si ModemManager se está ejecutando, ModemManager lo hará automáticamente dependiendo de los ID de proveedor/producto del dispositivo USB y sus otras interfaces.
References
  • () https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812 -
  • () https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118 -
  • () https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 -

22 Feb 2025, 10:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-22 10:15

Updated : 2025-09-23 19:14

NVD link : CVE-2025-21704

Mitre link : CVE-2025-21704

CVE.ORG link : CVE-2025-21704

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-787

Out-of-bounds Write