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Linux kernel nf_tables use-after-free security flaw (CVE-2026-23111)

Vulnerability
First reported
Last updated
Happening score
H score 24
1 unique sources, 1 articles

Summary

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A Linux kernel nf_tables use-after-free in CVE-2026-23111 is now publicly exploitable, putting systems at local root and container-breakout risk. Upstream patches have been available since February 5, 2026, and public exploit code has since been released. The flaw affects kernels that expose nf_tables together with unprivileged user namespaces.

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Timeline

  1. 08.06.2026 23:17 1 articles · 1mo ago

    Upstream patch fixes the Linux kernel nf_tables flaw CVE-2026-23111

    Mitigation Patch Update

    The Linux kernel upstream fix for CVE-2026-23111 removed the nf_tables use-after-free on February 5, 2026, closing a local privilege-escalation path that could let an unprivileged user reach root.

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  2. 08.06.2026 23:17 1 articles · 1mo ago

    FuzzingLabs reproduces CVE-2026-23111 on RHEL 10

    Technical Analysis Update

    FuzzingLabs reproduced the bug on RHEL 10 ahead of Pwn2Own Berlin 2026 and built its own root exploit by a different route, confirming that the nf_tables flaw could be weaponized for local privilege escalation.

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  3. 08.06.2026 23:17 2 articles · 1mo ago

    Exodus Intelligence releases a working exploit walkthrough for CVE-2026-23111

    Technical Analysis Update

    Exodus Intelligence released a detailed technical walkthrough on June 8 showing how the nf_tables use-after-free in CVE-2026-23111 can be chained into full local root and container breakout, with demonstrations on Debian Bookworm, Debian Trixie, Ubuntu 22.04 LTS, and Ubuntu 24.04 LTS.

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