CVE-2025-21689

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Source
https://cve.org/CVERecord?id=CVE-2025-21689
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21689.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21689
Downstream
Related
Published
2025-02-10T15:58:45.493Z
Modified
2026-03-20T12:37:39.321519Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()
Details

In the Linux kernel, the following vulnerability has been resolved:

USB: serial: quatech2: fix null-ptr-deref in qt2processread_urb()

This patch addresses a null-ptr-deref in qt2processread_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->numports - 1. When newport is equal to serial->numports, 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.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21689.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
f7a33e608d9ae022b7f49307921627e34e9484ed
Fixed
fa4c7472469d97c4707698b4c0e098f8cfc2bf22
Fixed
94770cf7c5124f0268d481886829dc2beecc4507
Fixed
6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe
Fixed
4b9b41fabcd38990f69ef0cee9c631d954a2b530
Fixed
6377838560c03b36e1153a42ef727533def9b68f
Fixed
f371471708c7d997f763b0e70565026eb67cc470
Fixed
8542b33622571f54dfc2a267fce378b6e3840b8b
Fixed
575a5adf48b06a2980c9eeffedf699ed5534fade

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21689.json"