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CVE-2023-1076 is a Linux kernel vulnerability in TUN/TAP socket initialization. A type confusion caused the UID associated with TUN/TAP sockets to be hardcoded to 0 rather than reflect the creating process's filesystem UID. This is incorrect when a non-root user is granted CAP_NET_ADMIN, allowing sockets to be misclassified during network filtering or routing decisions. The initially released fix was itself incorrect because it used the inode UID; corrected upstream changes set sk_uid from current_fsuid() in tun_chr_open() and tap_open().
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Prior Linux kernel TUN/TAP vulnerability whose initial fixes were incomplete.
Linux kernel TAP device socket UID initialization vulnerability.
Linux kernel TAP driver socket UID initialization vulnerability.
A Linux kernel tun/tap socket UID initialization flaw. An incorrect fix for CVE-2023-1076 could assign an incorrect socket UID, potentially enabling bypass of network filtering or routing decisions, particularly where a non-root user holds CAP_NET_ADMIN.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.