UBUNTU-CVE-2025-21689
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.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
43 explicit affected versions
59 explicit affected versions
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
19 explicit affected versions
6 explicit affected versions
69 explicit affected versions
24 explicit affected versions
54 explicit affected versions
72 explicit affected versions
62 explicit affected versions
55 explicit affected versions
10 explicit affected versions
15 explicit affected versions
22 explicit affected versions
61 explicit affected versions
191 explicit affected versions
7 explicit affected versions
60 explicit affected versions
19 explicit affected versions
100 explicit affected versions
13 explicit affected versions
85 explicit affected versions
21 explicit affected versions
35 explicit affected versions
21 explicit affected versions
19 explicit affected versions
18 explicit affected versions
20 explicit affected versions
118 explicit affected versions
64 explicit affected versions
24 explicit affected versions
102 explicit affected versions
13 explicit affected versions
4 explicit affected versions
121 explicit affected versions
23 explicit affected versions
29 explicit affected versions
1 explicit affected versions
1 explicit affected versions
21 explicit affected versions
16 explicit affected versions
10 explicit affected versions
57 explicit affected versions
25 explicit affected versions
3 explicit affected versions
7 explicit affected versions
12 explicit affected versions
111 explicit affected versions
2 explicit affected versions
52 explicit affected versions
12 explicit affected versions
14 explicit affected versions
7 explicit affected versions
2 explicit affected versions
89 explicit affected versions
12 explicit affected versions
105 explicit affected versions
113 explicit affected versions
12 explicit affected versions
19 explicit affected versions
100 explicit affected versions
120 explicit affected versions
15 explicit affected versions
16 explicit affected versions
11 explicit affected versions
10 explicit affected versions
37 explicit affected versions
3 explicit affected versions
13 explicit affected versions
17 explicit affected versions
10 explicit affected versions
1 explicit affected versions
37 explicit affected versions
26 explicit affected versions
13 explicit affected versions
144 explicit affected versions
12 explicit affected versions
1 explicit affected versions
29 explicit affected versions
93 explicit affected versions
13 explicit affected versions
66 explicit affected versions
18 explicit affected versions
19 explicit affected versions
1 explicit affected versions
87 explicit affected versions
61 explicit affected versions
105 explicit affected versions
24 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
1 explicit affected versions
188 explicit affected versions
11 explicit affected versions
12 explicit affected versions
7 explicit affected versions
12 explicit affected versions
103 explicit affected versions
138 explicit affected versions
2 explicit affected versions
52 explicit affected versions
46 explicit affected versions
132 explicit affected versions
62 explicit affected versions
165 explicit affected versions
154 explicit affected versions
10 explicit affected versions
26 explicit affected versions
23 explicit affected versions
38 explicit affected versions
1 explicit affected versions
14 explicit affected versions
24 explicit affected versions
13 explicit affected versions
24 explicit affected versions
139 explicit affected versions
63 explicit affected versions
16 explicit affected versions
63 explicit affected versions
27 explicit affected versions
53 explicit affected versions
116 explicit affected versions
3 explicit affected versions
93 explicit affected versions
1 explicit affected versions
2 explicit affected versions
2 explicit affected versions
70 explicit affected versions
51 explicit affected versions
92 explicit affected versions
11 explicit affected versions
21 explicit affected versions
12 explicit affected versions
49 explicit affected versions
27 explicit affected versions
36 explicit affected versions
1 explicit affected versions
1 explicit affected versions
98 explicit affected versions
20 explicit affected versions
8 explicit affected versions
26 explicit affected versions
5 explicit affected versions
8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
2 explicit affected versions
23 explicit affected versions
13 explicit affected versions
92 explicit affected versions
13 explicit affected versions
56 explicit affected versions
7 explicit affected versions
140 explicit affected versions
2 explicit affected versions
94 explicit affected versions
54 explicit affected versions
10 explicit affected versions
12 explicit affected versions
15 explicit affected versions
91 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
45 explicit affected versions
37 explicit affected versions
28 explicit affected versions
14 explicit affected versions
38 explicit affected versions
167 explicit affected versions
53 explicit affected versions
9 explicit affected versions
51 explicit affected versions
11 explicit affected versions
17 explicit affected versions
7 explicit affected versions
62 explicit affected versions
7 explicit affected versions
33 explicit affected versions
97 explicit affected versions
64 explicit affected versions
121 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
1 explicit affected versions
60 explicit affected versions
13 explicit affected versions
43 explicit affected versions
58 explicit affected versions
10 explicit affected versions
8 explicit affected versions
22 explicit affected versions
14 explicit affected versions
92 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
69 explicit affected versions
17 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/575a5adf48b06a2980c9eeffedf699ed5534fade
- https://git.kernel.org/stable/c/4b9b41fabcd38990f69ef0cee9c631d954a2b530
- https://git.kernel.org/stable/c/575a5adf48b06a2980c9eeffedf699ed5534fade
- https://git.kernel.org/stable/c/6068dcff7f19e9fa6fa23ee03453ad6a40fa4efe
- https://git.kernel.org/stable/c/6377838560c03b36e1153a42ef727533def9b68f
- https://git.kernel.org/stable/c/8542b33622571f54dfc2a267fce378b6e3840b8b
- https://git.kernel.org/stable/c/94770cf7c5124f0268d481886829dc2beecc4507
- https://git.kernel.org/stable/c/f371471708c7d997f763b0e70565026eb67cc470
- https://git.kernel.org/stable/c/fa4c7472469d97c4707698b4c0e098f8cfc2bf22
- https://ubuntu.com/security/CVE-2025-21689
- https://ubuntu.com/security/notices/USN-7387-1
- https://ubuntu.com/security/notices/USN-7387-2
- https://ubuntu.com/security/notices/USN-7387-3
- https://ubuntu.com/security/notices/USN-7388-1
- https://ubuntu.com/security/notices/USN-7389-1
- https://ubuntu.com/security/notices/USN-7390-1
- https://ubuntu.com/security/notices/USN-7391-1
- https://ubuntu.com/security/notices/USN-7392-1
- https://ubuntu.com/security/notices/USN-7392-2
- https://ubuntu.com/security/notices/USN-7392-3
- https://ubuntu.com/security/notices/USN-7392-4
- https://ubuntu.com/security/notices/USN-7393-1
- https://ubuntu.com/security/notices/USN-7401-1
- https://ubuntu.com/security/notices/USN-7407-1
- https://ubuntu.com/security/notices/USN-7413-1
- https://ubuntu.com/security/notices/USN-7421-1
- https://ubuntu.com/security/notices/USN-7445-1
- https://ubuntu.com/security/notices/USN-7448-1
- https://ubuntu.com/security/notices/USN-7458-1
- https://ubuntu.com/security/notices/USN-7459-1
- https://ubuntu.com/security/notices/USN-7459-2
- https://ubuntu.com/security/notices/USN-7463-1
- https://ubuntu.com/security/notices/USN-7539-1
- https://ubuntu.com/security/notices/USN-7540-1
- https://ubuntu.com/security/notices/USN-7595-1
- https://ubuntu.com/security/notices/USN-7595-2
- https://ubuntu.com/security/notices/USN-7595-3
- https://ubuntu.com/security/notices/USN-7595-4
- https://ubuntu.com/security/notices/USN-7595-5
- https://ubuntu.com/security/notices/USN-7596-1
- https://ubuntu.com/security/notices/USN-7596-2
- https://ubuntu.com/security/notices/USN-7653-1
- https://www.cve.org/CVERecord?id=CVE-2025-21689