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GHSA-j26p-6wx7-f3pw

HighCVSS 7 / 10
Published Aug 14, 2025·Last modified Aug 14, 2025
Affected Components(0)

No affected components available

Description

Summary

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
Risk Scores
Base Score
7.0

The vulnerability requires local access to the device to be exploited. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
6.4

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
0.17%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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