What’s Vulnerable › Vulnerabilities

CVE-2020-29373

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-11-28 · updated 2026-06-17
• Weakness: CWE-22

Description

An issue was discovered in fs/io_uring.c in the Linux kernel before 5.6. It unsafely handles the root directory during path lookups, and thus a process inside a mount namespace can escape to unintended filesystem locations, aka CID-ff002b30181d.

Affected products

• Linux kernel: before 5.6 — fixed in 5.6

How to fix

Upgrade to a fixed version: Linux kernel 5.6. Check the vendor advisory for mitigations.

References

• https://bugs.chromium.org/p/project-zero/issues/detail?id=2011
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff002b30181d30cdfbca316dadd099c3ca0d739c
• https://bugs.chromium.org/p/project-zero/issues/detail?id=2011
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ff002b30181d30cdfbca316dadd099c3ca0d739c

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