[HIGH] Patch glibc for CVE-2026-4046

[v-aaditya]

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

• Patch glibc for CVE-2026-4046
  • Upstream patch has been backported manually.
  • Patch matches with the upstream patch.
  • Upstream Patch Reference: https://sourceware.org/git/?p=glibc.git;a=patch;h=d6f08d1cf027f4eb2ba289a6cc66853722d4badc
• Bumped packages to rebuild with updated glibc and manifest files.

Change Log

• new file: SPECS/glibc/CVE-2026-4046.patch
• modified: SPECS-EXTENDED/buildah/buildah.spec
• modified: SPECS-EXTENDED/catatonit/catatonit.spec
• modified: SPECS-EXTENDED/crun/crun.spec
• modified: SPECS-EXTENDED/dyninst/dyninst.spec
• modified: SPECS-EXTENDED/podman/podman.spec
• modified: SPECS/busybox/busybox.spec
• modified: SPECS/flannel/flannel.spec
• modified: SPECS/glibc/glibc.spec
• modified: SPECS/kubernetes/kubernetes.spec
• modified: SPECS/kubevirt/kubevirt.spec
• modified: SPECS/libcap/libcap.spec
• modified: SPECS/libguestfs/libguestfs.spec
• modified: SPECS/qemu/qemu.spec
• modified: SPECS/rust/rust-1.75.spec
• modified: SPECS/rust/rust.spec
• modified: SPECS/supermin/supermin.spec
• modified: SPECS/tini/tini.spec
• modified: toolkit/resources/manifests/package/pkggen_core_aarch64.txt
• modified: toolkit/resources/manifests/package/pkggen_core_x86_64.txt
• modified: toolkit/resources/manifests/package/toolchain_aarch64.txt
• modified: toolkit/resources/manifests/package/toolchain_x86_64.txt

Does this affect the toolchain?

YES

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-2026-4046

Test Methodology

• Local build was successful.
• Patch applies cleanly
• License check script shows no warning.
• Installation and Uninstallation on docker image was successful.

[Kanishk-Bansal]

/azurepipelines run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Kanishk-Bansal]

/azurepipelines run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[Kanishk-Bansal]

Buddy Build

[v-aaditya]

Buddy Build

Buddy Build has passed !

[christopherco]

These changelog entries seem incorrect. Looks like multiple dates and an additional 0:1.41.4-7 is being added. Also the epoch number is being dropped.
Please investigate.
There should only be one new entry which adds 0:1.43.1-2

[v-aaditya]

The issue seems to occur because of this PR - https://github.com/microsoft/azurelinux/pull/16227/changes#diff-3a16540d10913456531c6e011d8fd1881d77104bc52c75e26d7a739eee858d3aL176 which got merged with wrong version history.
I have made 3 corrections -

• epoch value has been added in changelog version.
• Sumit's changelog history date has been updated as it was chronologically incorrect.
• I have added my changelog entry, which was removed by Sumit's merged PR.

[CBL-Mariner-Bot]

Auto cherry-pick results:

• 3.0-dev ❌ -> [AUTO-CHERRYPICK] [HIGH] Patch glibc for CVE-2026-4046 - branch 3.0-dev #17350
  -> Failed. Please see the logs for more information

Auto cherry-pick pipeline run -> https://dev.azure.com/mariner-org/mariner/_build/results?buildId=1121564&view=results