--- id: CVE-2024-21626 title: >- runc is a CLI tool for spawning and running containers on Linux according to the OCI specification summary: >- runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc 1.1.11 and earlier, due to an internal file descriptor leak, an attacker could cause a newly-spawned container process (from runc… severity: high cvss: 8.6 cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H' cwe: - CWE-403 - CWE-668 - CWE-200 vendor: linuxfoundation product: runc affected: - runc < 1.1.12 - fedora = 39 patched: - runc 1.1.12 published: '2024-01-31' updated: '2026-09-17' sourceUpdated: '2026-09-17T12:17:08.273' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-21626' references: - url: >- http://packetstormsecurity.com/files/176993/runc-1.1.11-File-Descriptor-Leak-Privilege-Escalation.html label: security-advisories@github.com - url: 'http://www.openwall.com/lists/oss-security/2024/02/01/1' label: security-advisories@github.com - url: 'http://www.openwall.com/lists/oss-security/2024/02/02/3' label: security-advisories@github.com - url: >- https://github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf label: security-advisories@github.com - url: 'https://github.com/opencontainers/runc/releases/tag/v1.1.12' label: security-advisories@github.com - url: >- https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv label: security-advisories@github.com - url: 'https://lists.debian.org/debian-lts-announce/2024/02/msg00005.html' label: security-advisories@github.com - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NLXNE23Q5ESQUAI22Z7A63JX2WMPJ2J/ label: security-advisories@github.com - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SYMO3BANINS6RGFQFKPRG4FIOJ7GWYTL/ label: security-advisories@github.com - url: >- http://packetstormsecurity.com/files/176993/runc-1.1.11-File-Descriptor-Leak-Privilege-Escalation.html label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2024/02/01/1' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2024/02/02/3' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://github.com/opencontainers/runc/releases/tag/v1.1.12' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://lists.debian.org/debian-lts-announce/2024/02/msg00005.html' label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NLXNE23Q5ESQUAI22Z7A63JX2WMPJ2J/ label: af854a3a-2127-422b-91ae-364da2661108 - url: >- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SYMO3BANINS6RGFQFKPRG4FIOJ7GWYTL/ label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://www.vicarius.io/vsociety/posts/leaky-vessels-part-1-cve-2024-21626' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2024:0645' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0662' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0666' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0670' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0684' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0717' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0748' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0752' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0755' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0756' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0757' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0758' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0759' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0760' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:0764' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:10149' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:10520' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:10525' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:10841' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:1270' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2024:4597' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2025:0115' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2025:0650' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2025:1711' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2025:2441' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2025:2701' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2025:2710' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2024-21626' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2258725' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-21626.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c tags: - nvd - cve.org - exploit-available exploitAvailable: true ssvc: exploitation: poc automatable: 'no' technicalImpact: total timestamp: '2024-04-19T04:01:01.696064Z' epss: 0.18087 epssPercentile: 0.97098 exploits: github: 17 githubRepos: - 'https://github.com/zpxlz/CVE-2024-21626-POC' - 'https://github.com/NitroCao/CVE-2024-21626' - 'https://github.com/skysbsb/CVE-2024-21626-POC' metasploit: - exploit/linux/local/runc_cwd_priv_esc checkedAt: '2026-09-26T09:05:30.846Z' ingestedAt: '2026-06-26T16:43:13.380Z' --- ## Overview runc is a CLI tool for spawning and running containers on Linux according to the OCI specification. In runc 1.1.11 and earlier, due to an internal file descriptor leak, an attacker could cause a newly-spawned container process (from runc exec) to have a working directory in the host filesystem namespace, allowing for a container escape by giving access to the host filesystem ("attack 2"). The same attack could be used by a malicious image to allow a container process to gain access to the host filesystem through runc run ("attack 1"). Variants of attacks 1 and 2 could be also be used to overwrite semi-arbitrary host binaries, allowing for complete container escapes ("attack 3a" and "attack 3b"). runc 1.1.12 includes patches for this issue. ## Affected - `runc < 1.1.12` - `fedora = 39` ## Remediation Upgrade past the affected range: - `runc 1.1.12`