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ALSA-2021:4154 — Moderate: container-tools:rhel8 security, bug fix, and enhancement update

Affected: AlmaLinux:8: crit, AlmaLinux:8: criu, AlmaLinux:8: criu-devel, AlmaLinux:8: criu-libs, AlmaLinux:8: libslirp, AlmaLinux:8: libslirp-devel, AlmaLinux:8: oci-seccomp-bpf-hook, AlmaLinux:8: python3-criu, AlmaLinux:8: slirp4netns, AlmaLinux:8: toolbox and 1 more

The container-tools module contains tools for working with containers, notably podman, buildah, skopeo, and runc.

Security Fix(es):

* buildah: Host environment variables leaked in build container when using chroot isolation (CVE-2021-3602)

* containers/storage: DoS via malicious image (CVE-2021-20291)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

Withdrawn: BELL-CVE-2021-3602 — CVE-2021-3602 does not affect BellSoft software

Withdrawn by the publisher.

CLEANSTART-2024-UF47484 — information disclosure flaw was found in Buildah, when building containers using chroot isolation

Affected: CleanStart: buildah

Security vulnerability affects the buildah package. An information disclosure flaw was found in Buildah, when building containers using chroot isolation.

EUVD-2026-21008

fkie_cve-2021-3602

An information disclosure flaw was found in Buildah, when building containers using chroot isolation. Running processes in container builds (e.g. Dockerfile RUN commands) can access environment variables from parent and grandparent processes. When run in a container in a CI/CD environment, environment variables may include sensitive information that was shared with the container in order to be used only by Buildah itself (e.g. container registry credentials).

GHSA-7638-r9r3-rmjj — Buildah processes using chroot isolation may leak environment values to intermediate processes

Affected: Go: github.com/containers/buildah

### Impact When running processes using "chroot" isolation, the process being run can examine the environment variables of its immediate parent and grandparent processes (CVE-2021-3602). This isolation type is often used when running `buildah` in unprivileged containers, and it is often used to do so in CI/CD environments. If sensitive information is exposed to the original `buildah` process through its environment, that information will unintentionally be shared with child processes which it starts as part of handling RUN instructions or during `buildah run`. The commands that `buildah` is instructed to run can read that information if they choose to.

### Patches Users should upgrade packages, or images which contain packages, to include version 1.21.3 or later.

### Workarounds As a workaround, invoking `buildah` in a container under `env -i` to have it started with a reinitialized environment should prevent the leakage.

### For more information If you have any questions or comments about this advisory: * Open an issue in [buildah](https://github.com/containers/buildah/issues) * Email us at [the buildah general mailing list](mailto:buildah@lists.buildah.io), or [the podman security mailing list](mailto:security@lists.podman.io) if it's sensitive.

gsd-2021-3602

msrc_CVE-2021-3602 — An information disclosure flaw was found in Buildah when building containers using chroot isolation. Running processes…

msrc_CVE-2021-3602

openSUSE-SU-2022:23018-1 — Security update for conmon, libcontainers-common, libseccomp, podman

Security update for conmon, libcontainers-common, libseccomp, podman

SUSE-SU-2022:23018-1 — Security update for conmon, libcontainers-common, libseccomp, podman

Security update for conmon, libcontainers-common, libseccomp, podman

UBUNTU-CVE-2021-3602

Affected: Ubuntu:22.04:LTS: golang-github-containers-buildah, Ubuntu:Pro:24.04:LTS: golang-github-containers-buildah, Ubuntu:25.10: golang-github-containers-buildah, Ubuntu:Pro:26.04:LTS: golang-github-containers-buildah

WID-SEC-W-2022-0571 — Red Hat Enterprise Linux: Mehrere Schwachstellen

Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um einen Cross-Site-Scripting-Angriff durchzuführen, vertrauliche Informationen offenzulegen, einen Denial-of-Service-Zustand herbeizuführen, Sicherheitsmaßnahmen zu umgehen, beliebigen Code auszuführen, Dateien zu manipulieren und einen nicht spezifizierten Angriff durchzuführen.