CVE-2025-21704

HIGH EPSS 24.6%
Published Feb 22, 20251y ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Feb 22, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
24.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥2.6.13  –  <5.4.291
linuxlinux_kernel*≥5.5  –  <5.10.235
linuxlinux_kernel*≥5.11  –  <5.15.179
linuxlinux_kernel*≥5.16  –  <6.1.129
linuxlinux_kernel*≥6.2  –  <6.6.79
linuxlinux_kernel*≥6.7  –  <6.12.16
linuxlinux_kernel*≥6.13  –  <6.13.4
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any

References 12

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • git.kernel.org https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
  • project-zero.issues.chromium.org https://project-zero.issues.chromium.org/issues/395107243
    ExploitIssue TrackingThird Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/383d516a0ebc8641372b521c8cb717f0f1834831
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6abb510251e75f875797d8983a830e6731fa281c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7828e9363ac4d23b02419bf2a45b9f1d9fb35646
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/871619c2b78fdfe05afb4e8ba548678687beb812
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/90dd2f1b7342b9a671a5ea4160f408037b92b118
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e563b01208f4d1f609bcab13333b6c0e24ce6a01
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f64079bef6a8a7823358c3f352ea29a617844636
    Patch