Upgrade containerd2 version to 2.1.6

[jykanase]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

---

Summary

• Upgrade containerd2 to 2.1.7
• containerd2.signatures.json — Update source tarball hash
• cgmanifest.json — Update version and download URL
• skipping the test "TestCgroupNamespace" because the kernel doesn’t support cgroup namespaces.
• multi-snapshotters-support.patch — Rebase for 2.1.7
• Removed 10 CVE patches now fixed upstream in 2.1.7:
  CVE-2024-25621.patch
  CVE-2024-40635.patch
  CVE-2024-45338.patch
  CVE-2025-22872.patch
  CVE-2025-27144.patch
  CVE-2025-47291.patch
  CVE-2025-47911.patch
  CVE-2025-58190.patch
  CVE-2025-64329.patch
  fix-credential-leak-in-cri-errors.patch

Change Log

• Removed 10 CVE patches now fixed upstream in 2.1.7

Does this affect the toolchain?

YES/NO

Associated issues

• #xxxx

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-YYYY-XXXX

Test Methodology

• local build

[Kanishk-Bansal]

/azurepipelines run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[CBL-Mariner-Bot]

Auto cherry-pick results:

• 3.0-dev ✅ -> [AUTO-CHERRYPICK] Upgrade containerd2 version to 2.1.6 - branch 3.0-dev #16731

Auto cherry-pick pipeline run -> https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1097604&view=results