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High 7.9

The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across…

CVE-2026-78408 First seen on SecPulse

Summary

Vulnerability reported (CVE-2026-78408). Data can be tampered with by attackers.

AI summary

Produced by SecPulse using an external AI model; it may contain mistakes. Check the original description and references below before acting on it.

A vulnerability tracked as CVE-2026-78408 has been found.
Data can be tampered with by attackers. CVSS score: 7.9/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-78408" on the vendor's site.

CVE-2026-78408 — CWE-775 / CVSS v3 7.9
Attack vector: local
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

What is the problem

A vulnerability (CWE-775) has been reported.

Affected scope

Check the vendor advisory for the affected versions.

Severity

Severity: High (CVSS 7.9/10). Data can be tampered with by attackers.

How to fix

Update to the patched release per vendor advisory.

Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposureidentify
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。

  2. 2
    Post-deployment verificationverify
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Fix status by distribution

Records published by each distribution for this CVE. Fixed versions differ by release; check each link.

Original description The description as published by the source.

The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.

Source: NIST National Vulnerability Database NVD

References

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