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CVE-2023-1076

Public on 2023-03-21
Modified on 2024-03-01
Description

Due to a type confusion during initializations, the tun and tap sockets in the Linux Kernel have their socket UID hardcoded to 0, i.e. root. While it will be often correct, as TUN/TAP devices require CAP_NET_ADMIN, it may not always be the case. The socket UID may be used for network filtering and routing, thus TUN/TAP sockets may be incorrectly managed, potentially bypassing network filters based on UID.

Severity
Medium
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CVSS v3 Base Score
4.7
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Kernel-5.10 Extra kernel 2023-03-17 16:46 ALAS2KERNEL-5.10-2023-028
Amazon Linux 2 - Kernel-5.15 Extra kernel 2023-03-17 16:46 ALAS2KERNEL-5.15-2023-015
Amazon Linux 2 - Kernel-5.4 Extra kernel 2023-03-17 16:45 ALAS2KERNEL-5.4-2023-043
Amazon Linux 2023 kernel 2023-03-20 18:27 ALAS2023-2023-138

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

Red Hat: CVE-2023-1076 Mitre: CVE-2023-1076 FAQs regarding Amazon Linux ALAS/CVE Severity