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CVE-2025-52881 is a race-condition vulnerability in runc, the OCI container runtime, that affects versions 1.2.7, 1.3.2, and 1.4.0-rc.2. The flaw allows an attacker to cause runc to misdirect writes intended for procfs to unintended procfs targets by exploiting a racing container with shared mounts. The redirection can be achieved through symlink manipulation in tmpfs and potentially through other mount-based techniques such as bind mounts. The issue is closely related to CVE-2019-19921, but the earlier mitigation only verified that certain LSM label writes targeted procfs, which was insufficient to prevent broader write redirection. Because runc performs writes to /proc during container setup, an attacker can transform legitimate runtime writes into attacker-chosen writes to sensitive procfs files, including writes associated with sysctl configuration and security labeling.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
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57 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A runC vulnerability that allows write redirection from /proc via symlinks, enabling bypass of Security Linux Module labels by redirecting runC writes into attacker-controlled procfs files, potentially leading to container escape and host root compromise.
A vulnerability in runc allows attackers to bypass SELinux and AppArmor protections by redirecting writes to procfs files, enabling full host compromise from a container.
A vulnerability in runC that allows circumvention of Linux Security Module (LSM) relabel protections, enabling arbitrary writes and facilitating container escape.
A vulnerability in runC allowing attackers to redirect writes to /proc, bypassing LSM relabel protections and enabling arbitrary writes to sensitive files, potentially leading to container escape.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.