CVE-2019-19921

runc through 1.0.0-rc9 has Incorrect Access Control leading to Escalation of Privileges, related to libcontainer/rootfs_linux.go. To exploit this, an attacker must be able to spawn two containers with custom volume-mount configurations, and be able to run custom images. (This vulnerability does not affect Docker due to an implementation detail that happens to block the attack.)

Published: 2020-02-12 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-19921 is rated Moderate Risk (40.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.46%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-19921

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.19% 0.46% +0.27%
2 2026-05-22 0.13% 0.19% +0.07%
3 2026-03-04 — 0.13% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-19921

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.0 3.1 HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.0 5.9 [email protected]
4.4 2.0 MEDIUM
AV:L/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.4 6.4 [email protected]

Weakness enumeration for CVE-2019-19921

GitHub Security Advisory for CVE-2019-19921

GHSA-fh74-hm69-rqjw · Severity: medium · Ecosystem: go — opencontainers runc contains procfs race condition with a shared volume mount

OS Trackers for CVE-2019-19921

vendor priority summary link
alpine high CVE-2019-19921: 2 source package rows (containerd, runc); 15 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 15, open 0. https://security.alpinelinux.org/vuln/CVE-2019-19921
debian not yet assigned CVE-2019-19921 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-2019-19921
gentoo high CVE-2019-19921: 1 GLSA(s) (202003-21), 1 atom(s) (app-emulation/runc); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-19921
redhat medium — https://access.redhat.com/security/cve/CVE-2019-19921
ubuntu medium CVE-2019-19921 medium priority: Ubuntu including 1 source packages (runc), 13 status rows across 13 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, trusty, upstream, xenial): released 11, DNE 1, ignored 1. https://ubuntu.com/security/CVE-2019-19921

Affected software / configurations for CVE-2019-19921

Vendor Product Version Raw CPE
linuxfoundation runc <= 0.1.1 cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc1:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc2:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc3:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc4:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc5:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc6:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc7:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc8:*:*:*:*:*:*
linuxfoundation runc 1.0.0 cpe:2.3:a:linuxfoundation:runc:1.0.0:rc9:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
opensuse leap 15.1 cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 19.10 cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
redhat openshift_container_platform 4.1 cpe:2.3:a:redhat:openshift_container_platform:4.1:*:*:*:*:*:*:*
redhat openshift_container_platform 4.2 cpe:2.3:a:redhat:openshift_container_platform:4.2:*:*:*:*:*:*:*

References for CVE-2019-19921

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00018.html Broken Link Mailing List Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0688 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0695 Third Party Advisory
https://github.com/opencontainers/runc/issues/2197 Issue Tracking Patch Third Party Advisory
https://github.com/opencontainers/runc/pull/2190 Issue Tracking Third Party Advisory
https://github.com/opencontainers/runc/releases Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/03/msg00023.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ANUGDBJ7NBUMSUFZUSKU3ZMQYZ2Z3STN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DHGVGGMKGZSJ7YO67TGGPFEHBYMS63VF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNB2UEDIIJCRQW4WJLZOPQJZXCVSXMLD/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FYVE3GB4OG3BNT5DLQHYO4M5SXX33AQ5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I6BF24VCZRFTYBTT3T7HDZUOTKOTNPLZ/
https://security-tracker.debian.org/tracker/CVE-2019-19921 Third Party Advisory
https://security.gentoo.org/glsa/202003-21 Third Party Advisory
https://usn.ubuntu.com/4297-1/ Third Party Advisory
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