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Vulnerability record · CVE-2021-30465 · published 27 May 2021

CVE-2021-30465: Linuxfoundation runc race condition vulnerability

Linuxfoundation · Runc

runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.

8.5 CVSS 3.1 High EPSS 6.6% · top 6.4% CWE-362 · Race condition
8.5CVSS 3.1 base score, v2 6.0
6.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
26References
17 Jun 2026Last modified by NVD

Description

runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
https://bugzilla.opensuse.org/show_bug.cgi?id=1185405 Issue Tracking
https://github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595f PatchThird Party Advisory
https://github.com/opencontainers/runc/releases Release NotesThird Party Advisory
https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7r PatchThird 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/35ZW6NBZSBH5PWIT7JU4HXO
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HOARVIT47RULTTFWAU7XBG
https://security.gentoo.org/glsa/202107-26 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210708-0003/ Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/19/2 Mailing ListThird Party Advisory
https://bugzilla.opensuse.org/show_bug.cgi?id=1185405 Issue Tracking
https://github.com/opencontainers/runc/commit/0ca91f44f1664da834bc61115a849b56d22f595f PatchThird Party Advisory
https://github.com/opencontainers/runc/releases Release NotesThird Party Advisory
https://github.com/opencontainers/runc/security/advisories/GHSA-c3xm-pvg7-gh7r PatchThird 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/35ZW6NBZSBH5PWIT7JU4HXO
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HOARVIT47RULTTFWAU7XBG
https://security.gentoo.org/glsa/202107-26 Third Party Advisory
https://security.netapp.com/advisory/ntap-20210708-0003/ Third Party Advisory

Track CVE-2021-30465 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

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Source: NIST National Vulnerability Database (record CVE-2021-30465), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.