CVE-2023-1076
First published: Sun Feb 26 2023(Updated: )
A flaw 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. References: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=66b2c338adce580dfce2199591e65e2bab889cff">https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=66b2c338adce580dfce2199591e65e2bab889cff</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a096ccca6e503a5c575717ff8a36ace27510ab0a">https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a096ccca6e503a5c575717ff8a36ace27510ab0a</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | ||
| redhat/kernel | <6.1.16 | 6.1.16 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=66b2c338adce580dfce2199591e65e2bab889cff
- https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a096ccca6e503a5c575717ff8a36ace27510ab0a
- https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html
- https://launchpad.net/bugs/cve/CVE-2023-1076
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2212180
- https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com/
- https://access.redhat.com/errata/RHSA-2023:6583
- https://bugzilla.redhat.com/show_bug.cgi?id=2173435
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1076
- https://nvd.nist.gov/vuln/detail/CVE-2023-1076
- https://security-tracker.debian.org/tracker/CVE-2023-1076
- https://ubuntu.com/security/CVE-2023-1076
- https://git.kernel.org/linus/66b2c338adce580dfce2199591e65e2bab889cff
- https://git.kernel.org/linus/a096ccca6e503a5c575717ff8a36ace27510ab0a
- https://www.openwall.com/lists/oss-security/2023/03/01/5
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