UBUNTU-CVE-2023-1076
A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.
02 / AFFECTED SOFTWARE
Affected packages
14 explicit affected versions
22 explicit affected versions
50 explicit affected versions
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12 explicit affected versions
6 explicit affected versions
31 explicit affected versions
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28 explicit affected versions
17 explicit affected versions
24 explicit affected versions
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35 explicit affected versions
5 explicit affected versions
14 explicit affected versions
118 explicit affected versions
12 explicit affected versions
67 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
21 explicit affected versions
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22 explicit affected versions
7 explicit affected versions
12 explicit affected versions
111 explicit affected versions
15 explicit affected versions
12 explicit affected versions
7 explicit affected versions
57 explicit affected versions
12 explicit affected versions
70 explicit affected versions
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12 explicit affected versions
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10 explicit affected versions
37 explicit affected versions
5 explicit affected versions
1 explicit affected versions
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13 explicit affected versions
1 explicit affected versions
29 explicit affected versions
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13 explicit affected versions
28 explicit affected versions
1 explicit affected versions
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70 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
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12 explicit affected versions
7 explicit affected versions
69 explicit affected versions
138 explicit affected versions
17 explicit affected versions
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25 explicit affected versions
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26 explicit affected versions
4 explicit affected versions
139 explicit affected versions
29 explicit affected versions
15 explicit affected versions
28 explicit affected versions
18 explicit affected versions
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3 explicit affected versions
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1 explicit affected versions
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12 explicit affected versions
16 explicit affected versions
4 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
98 explicit affected versions
5 explicit affected versions
1 explicit affected versions
58 explicit affected versions
13 explicit affected versions
24 explicit affected versions
140 explicit affected versions
94 explicit affected versions
20 explicit affected versions
10 explicit affected versions
4 explicit affected versions
12 explicit affected versions
57 explicit affected versions
44 explicit affected versions
16 explicit affected versions
13 explicit affected versions
14 explicit affected versions
37 explicit affected versions
38 explicit affected versions
167 explicit affected versions
18 explicit affected versions
9 explicit affected versions
18 explicit affected versions
8 explicit affected versions
25 explicit affected versions
31 explicit affected versions
121 explicit affected versions
4 explicit affected versions
1 explicit affected versions
23 explicit affected versions
43 explicit affected versions
24 explicit affected versions
58 explicit affected versions
4 explicit affected versions
47 explicit affected versions
1 explicit affected versions
69 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/66b2c338adce580dfce2199591e65e2bab889cff
- https://git.kernel.org/linus/a096ccca6e503a5c575717ff8a36ace27510ab0a
- https://ubuntu.com/security/CVE-2023-1076
- https://ubuntu.com/security/notices/USN-6033-1
- https://ubuntu.com/security/notices/USN-6171-1
- https://ubuntu.com/security/notices/USN-6172-1
- https://ubuntu.com/security/notices/USN-6185-1
- https://ubuntu.com/security/notices/USN-6187-1
- https://ubuntu.com/security/notices/USN-6207-1
- https://ubuntu.com/security/notices/USN-6222-1
- https://ubuntu.com/security/notices/USN-6223-1
- https://ubuntu.com/security/notices/USN-6256-1
- https://ubuntu.com/security/notices/USN-6385-1
- https://www.cve.org/CVERecord?id=CVE-2023-1076