GHSA-v95c-p5hm-xq8f · 深刻度： medium · エコシステム： go — Overflow in netlink bytemsg length field allows attacker to override netlink-based container configuration in RunC
runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc, netlink is used internally as a serialization system for specifying the relevant container configuration to the `C` portion of the code (responsible for the based namespace setup of containers). In all versions of runc prior to 1.0.3, the encoder did not handle the possibility of an integer overflow in the 16-bit length field for the byte array attribute type, meaning that a large enough malicious byte array attribute could result in the length overflowing and the attribute contents being parsed as netlink messages for container configuration. This vulnerability requires the attacker to have some control over the configuration of the container and would allow the attacker to bypass the namespace restrictions of the container by simply adding their own netlink payload which disables all namespaces. The main users impacted are those who allow untrusted images with untrusted configurations to run on their machines (such as with shared cloud infrastructure). runc version 1.0.3 contains a fix for this bug. As a workaround, one may try disallowing untrusted namespace paths from your container. It should be noted that untrusted namespace paths would allow the attacker to disable namespace protections entirely even in the absence of this bug.
総合評価: CVE-2021-43784 は悪用リスクが高い（66.3/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 1.66%、74 パーセンタイル） 根拠: 公開エクスプロイトが 1 件参照されています（Exploit-DB）。 直近 1 日で EPSS が +1.53% 上昇。悪用への関心が高まっている可能性があります。 推奨対応: 公開エクスプロイトが確認されています。影響範囲の確認、緩和策の適用、パッチ適用を優先してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
| EDB-ID | ソース | 種別 | 公開 | リンク |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.13% | 1.66% | +1.53% |
| 2 | 2025-11-21 | 1.31% | 0.13% | -1.18% |
| 3 | 2025-11-18 | — | 1.31% | — |
EPSS の全履歴 （全 16 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 6.0 | 3.1 | MEDIUM |
|
1.8 | 3.7 | [email protected] |
| 5.0 | 3.1 | MEDIUM |
|
1.6 | 3.4 | [email protected] |
| 6.0 | 2.0 | MEDIUM |
|
6.8 | 6.4 | [email protected] |
GHSA-v95c-p5hm-xq8f · 深刻度： medium · エコシステム： go — Overflow in netlink bytemsg length field allows attacker to override netlink-based container configuration in RunC
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2021-43784: 1 source package rows (runc); 16 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 9. | https://security.alpinelinux.org/vuln/CVE-2021-43784 |
debian
|
not yet assigned | CVE-2021-43784 not yet assigned priority: Debian including 1 source packages (runc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2021-43784 |
gentoo
|
normal | CVE-2021-43784: 1 GLSA(s) (202408-25), 1 atom(s) (app-containers/runc); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2021-43784 |
redhat
|
low | — | https://access.redhat.com/security/cve/CVE-2021-43784 |
ubuntu
|
low | CVE-2021-43784 low priority: Ubuntu including 1 source packages (runc), 15 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 9, ignored 3, released 2, needed 1. | https://ubuntu.com/security/CVE-2021-43784 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| linuxfoundation | runc | < 1.0.3 | cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:* |
| debian | debian_linux | 9.0 | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
| URL | タグ |
|---|---|
| https://bugs.chromium.org/p/project-zero/issues/detail?id=2241 | Exploit Third Party Advisory |
| https://github.com/opencontainers/runc/commit/9c444070ec7bb83995dbc0185da68284da71c554 | Patch Third Party Advisory |
| https://github.com/opencontainers/runc/commit/d72d057ba794164c3cce9451a00b72a78b25e1ae | Patch Third Party Advisory |
| https://github.com/opencontainers/runc/commit/f50369af4b571e358f20b139eea52d612eb55eed | Patch Third Party Advisory |
| https://github.com/opencontainers/runc/security/advisories/GHSA-v95c-p5hm-xq8f | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/12/msg00005.html | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2024/02/msg00005.html |