# CVE-2024-21626

## Summary

- **CVE ID:** CVE-2024-21626
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H)
- **CWE:** CWE-403, CWE-668
- **Published:** Jan 31, 2024
- **Last Modified:** Aug 24, 2026

## Description

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 Products

- opencontainers — runc (>=v1.0.0-rc93, < 1.1.12)

## References

- [CNA](https://github.com/opencontainers/runc/security/advisories/GHSA-xr7r-f8xq-vfvv)
- [CNA](https://github.com/opencontainers/runc/commit/02120488a4c0fc487d1ed2867e901eeed7ce8ecf)
- [CNA](https://github.com/opencontainers/runc/releases/tag/v1.1.12)
- [CNA](http://www.openwall.com/lists/oss-security/2024/02/01/1)
- [CNA](http://www.openwall.com/lists/oss-security/2024/02/02/3)
- [CNA](http://packetstormsecurity.com/files/176993/runc-1.1.11-File-Descriptor-Leak-Privilege-Escalation.html)
- [CNA](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SYMO3BANINS6RGFQFKPRG4FIOJ7GWYTL/)
- [CNA](https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2NLXNE23Q5ESQUAI22Z7A63JX2WMPJ2J/)
- [CNA](https://lists.debian.org/debian-lts-announce/2024/02/msg00005.html)
- [CVE](https://www.vicarius.io/vsociety/posts/leaky-vessels-part-1-cve-2024-21626)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2024-21626)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2258725)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-21626.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:1270)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0717)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:4597)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0684)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2025:2441)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0666)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2025:2701)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0662)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2025:2710)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0645)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2025:1711)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:10525)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:10841)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:10149)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2025:0650)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:10520)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2025:0115)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0758)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0760)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0757)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0764)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0759)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0748)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0752)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0756)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0755)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2024:0670)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 18.09%
- **EPSS Percentile:** 97.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._