GHSA-J26P-6WX7-F3PW
Vulnerability from github – Published: 2025-08-14 16:39 – Updated: 2025-08-14 19:37Summary
If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.
Details
For security reasons, container creation should be prohibited if /proc or /sys in the rootfs is a symbolic link.
I verified this behavior with youki.
When /proc or /sys is a symbolic link, runc fails to create the container, whereas youki successfully creates it.
This is the fix related to this issue in runc.
* https://github.com/opencontainers/runc/pull/3756
* https://github.com/opencontainers/runc/pull/3773
* https://github.com/opencontainers/runc/blob/main/libcontainer/rootfs_linux.go#L590
* https://github.com/opencontainers/runc/blob/main/tests/integration/mask.bats#L60
Impact
The following advisory appears to be related to this vulnerability: * https://github.com/advisories/GHSA-vpvm-3wq2-2wvm * https://github.com/advisories/GHSA-fh74-hm69-rqjw
{
"affected": [
{
"package": {
"ecosystem": "crates.io",
"name": "youki"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.5.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-54867"
],
"database_specific": {
"cwe_ids": [
"CWE-61"
],
"github_reviewed": true,
"github_reviewed_at": "2025-08-14T16:39:04Z",
"nvd_published_at": "2025-08-14T16:15:39Z",
"severity": "HIGH"
},
"details": "### Summary\nIf `/proc` and `/sys` in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem.\n\n### Details\n\nFor security reasons, container creation should be prohibited if `/proc` or `/sys` in the rootfs is a symbolic link.\nI verified this behavior with `youki`.\nWhen `/proc` or `/sys` is a symbolic link, `runc` fails to create the container, whereas `youki` successfully creates it.\n\nThis is the fix related to this issue in `runc`.\n* https://github.com/opencontainers/runc/pull/3756\n* https://github.com/opencontainers/runc/pull/3773\n* https://github.com/opencontainers/runc/blob/main/libcontainer/rootfs_linux.go#L590\n* https://github.com/opencontainers/runc/blob/main/tests/integration/mask.bats#L60\n\n\n### Impact\n\nThe following advisory appears to be related to this vulnerability:\n* https://github.com/advisories/GHSA-vpvm-3wq2-2wvm\n* https://github.com/advisories/GHSA-fh74-hm69-rqjw",
"id": "GHSA-j26p-6wx7-f3pw",
"modified": "2025-08-14T19:37:22Z",
"published": "2025-08-14T16:39:04Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/youki-dev/youki/security/advisories/GHSA-j26p-6wx7-f3pw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-54867"
},
{
"type": "WEB",
"url": "https://github.com/youki-dev/youki/commit/0d9b4f2aa5ceaf988f3eb568711d2acf0a4ace37"
},
{
"type": "PACKAGE",
"url": "https://github.com/youki-dev/youki"
},
{
"type": "WEB",
"url": "https://github.com/youki-dev/youki/releases/tag/v0.5.5"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Youki: If /proc and /sys in the rootfs are symbolic links, they can potentially be exploited to gain access to the host root filesystem."
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
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