CVE-2025-52565: runc — Exploit & Fix

Description

runc is a CLI tool for spawning and running containers according to the OCI specification. Versions 1.0.0-rc3 through 1.2.7, 1.3.0-rc.1 through 1.3.2, and 1.4.0-rc.1 through 1.4.0-rc.2, due to insufficient checks when bind-mounting `/dev/pts/$n` to `/dev/console` inside the container, an attacker can trick runc into bind-mounting paths which would normally be made read-only or be masked onto a path that the attacker can write to. This attack is very similar in concept and application to CVE-2025-31133, except that it attacks a similar vulnerability in a different target (namely, the bind-mount of `/dev/pts/$n` to `/dev/console` as configured for all containers that allocate a console). This happens after `pivot_root(2)`, so this cannot be used to write to host files directly -- however, as with CVE-2025-31133, this can load to denial of service of the host or a container breakout by providing the attacker with a writable copy of `/proc/sysrq-trigger` or `/proc/sys/kernel/core_pattern` (respectively). This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3.

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-61 CWE-61

CWE-363 CWE-363

Affected Products

Vendor	Product	Versions
linuxfoundation	runc	1.0.1 — 1.2.8
linuxfoundation	runc	1.3.0 — 1.3.3
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All
linuxfoundation	runc	All

References

Advisories & Patches

Exploits

https://github.com/opencontainers/runc/security/advisories/GHSA-qw9x-cqr3-wc7r

Frequently Asked Questions

What is CVE-2025-52565? +

runc is a CLI tool for spawning and running containers according to the OCI specification. Versions 1.0.0-rc3 through 1.2.7, 1.3.0-rc.1 through 1.3.2, and 1.4.0-rc.1 through 1.4.0-rc.2, due to insufficient checks when bind-mounting `/dev/pts/$n` to `/dev/console` inside the container, an attacker can trick runc into bind-mounting paths which would normally be made read-only or be masked onto a path that the attacker can write to. This attack is very similar in concept and application to CVE-2025-31133, except that it attacks a similar vulnerability in a different target (namely, the bind-mount of `/dev/pts/$n` to `/dev/console` as configured for all containers that allocate a console). This happens after `pivot_root(2)`, so this cannot be used to write to host files directly -- however, as with CVE-2025-31133, this can load to denial of service of the host or a container breakout by providing the attacker with a writable copy of `/proc/sysrq-trigger` or `/proc/sys/kernel/core_pattern` (respectively). This issue is fixed in versions 1.2.8, 1.3.3 and 1.4.0-rc.3. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-52565? +

CVE-2025-52565 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-52565? +

CVE-2025-52565 affects products from linuxfoundation, specifically: runc. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-52565? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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