CVE-2025-21689

MEDIUM EPSS 10.1%
Published Feb 10, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 10, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb() This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following: if (newport > serial->num_ports) { dev_err(&port->dev, "%s - port change to invalid port: %i\n", __func__, newport); break; } The condition doesn't account for the valid range of the serial->port buffer, which is from 0 to serial->num_ports - 1. When newport is equal to serial->num_ports, the assignment of "port" in the following code is out-of-bounds and NULL: serial_priv->current_port = newport; port = serial->port[serial_priv->current_port]; The fix checks if newport is greater than or equal to serial->num_ports indicating it is out-of-bounds.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
10.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥3.5  –  <5.4.290
linuxlinux_kernel*≥5.5  –  <5.10.234
linuxlinux_kernel*≥5.11  –  <5.15.178
linuxlinux_kernel*≥5.16  –  <6.1.128
linuxlinux_kernel*≥6.2  –  <6.6.75
linuxlinux_kernel*≥6.7  –  <6.12.12
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/4b9b41fabcd38990f69ef0cee9c631d954a2b530
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fade
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6377838560c03b36e1153a42ef727533def9b68f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8542b33622571f54dfc2a267fce378b6e3840b8b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/94770cf7c5124f0268d481886829dc2beecc4507
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f371471708c7d997f763b0e70565026eb67cc470
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fa4c7472469d97c4707698b4c0e098f8cfc2bf22
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/4b9b41fabcd38990f69ef0cee9c631d954a2b530
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fade
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6377838560c03b36e1153a42ef727533def9b68f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8542b33622571f54dfc2a267fce378b6e3840b8b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/94770cf7c5124f0268d481886829dc2beecc4507
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f371471708c7d997f763b0e70565026eb67cc470
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fa4c7472469d97c4707698b4c0e098f8cfc2bf22
    Patch