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CVE-2026-47243

Path Traversal in github.com/kata-containers/kata-containers (CVE-2026-47243)

Summary

Path traversal in github.com/kata-containers/kata-containers (CVE-2026-47243). Risk of unauthorized operations or information disclosure. Exploitable via virtiofsd. Mitigation: upgrade to 0.0.0-20260519062212-ffa59ce3aa78 or later.

Original description

The description as published by the source.

Summary

In the runtime-rs standalone virtio-fs path, verified here with QEMU (and verified with Cloud Hypervisor too), Kata Containers runs host virtiofsd as root with:

--sandbox none --seccomp none

If an attacker has root-equivalent execution inside the Kata guest VM, they can send raw FUSE requests directly to the host virtiofsd. With the tested runtime-rs virtio-fs configuration, a raw FUSE_SYMLINK request whose new symlink name is an absolute host path is honored outside the virtio-fs shared directory.

This lets guest root create host-root owned symlinks in sensitive host paths. The PoC created here will create symlinks in the host /etc/cron.d directory, causing host cron to execute a guest-controlled payload as host root.

Impact: guest root can execute code as host root.

Affected configuration

The verified host used:

/opt/kata/share/defaults/kata-containers/runtime-rs/configuration-qemu-runtime-rs.toml

rootless = false
shared_fs = "virtio-fs"
virtio_fs_daemon = "/opt/kata/libexec/virtiofsd"
hypervisor_name = "qemu"
debug_console_enabled = false

Pinned upstream references, using Kata Containers main commit 2ffd1538a296cff93a357bfba0dfca747480a1f8:

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-47243 has been found in github.com/kata-containers/kata-containers.
Attackers can target a specific entry point like virtiofsd over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade github.com/kata-containers/kata-containers to 0.0.0-20260519062212-ffa59ce3aa78 or later.
If unsure, ask your IT team or search "github.com/kata-containers/kata-containers CVE-2026-47243" on the vendor's site.

CVE-2026-47243 (github.com/kata-containers/kata-containers) — CWE-22
Attack surface: virtiofsd / FUSE_SYMLINK / main / shared_fs
Patched: 0.0.0-20260519062212-ffa59ce3aa78 — apply immediately
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

Path traversal (CWE-22) exists in github.com/kata-containers/kata-containers. Attackers reach the vulnerable code path via virtiofsd.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/kata-containers/kata-containers. Attack surface: virtiofsd / FUSE_SYMLINK / main / shared_fs.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 0.0.0-20260519062212-ffa59ce3aa78.

🛡️ 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. Run grep -r 'github.com/kata-containers/kata-containers' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

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

  1. 1
    Identify exposure identify 
    grep -r 'github.com/kata-containers/kata-containers' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/kata-containers/kata-containers を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/kata-containers/kata-containers to 0.0.0-20260519062212-ffa59ce3aa78

    ステージング環境で 0.0.0-20260519062212-ffa59ce3aa78 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    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。

Affected packages

go github.com/kata-containers/kata-containers
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20260519062212-ffa59ce3aa78"}]}]

References

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