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CVE-2026-46054 is an incorrect-authorization vulnerability in the Linux kernel's SELinux enforcement for OverlayFS. The intended security model requires the current task to have access to the top-level user file and the mount creator's credentials to authorize access to the lower-level backing file. The vulnerable implementation does not properly enforce this model during mmap() and mprotect() operations, potentially permitting file access that SELinux should deny. The fix adds backing-file checks through the security_mmap_backing_file() Linux Security Module hook and uses the backing-file API and a new LSM blob to supply the information required for mprotect() authorization.
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23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel SELinux access-control flaw affecting mmap() and mprotect() operations on overlayfs filesystems. Missing or improper checks fail to enforce the intended permissions on backing files. The fix adds backing-file enforcement through an LSM hook and backing-file security information. The advisory assigns a CVSS v3 score of 7.0, with local access, low privileges, high attack complexity, and potentially high confidentiality, integrity, and availability impacts.
A Linux kernel SELinux access-control flaw affecting OverlayFS mmap() and mprotect() access checks.
A Linux kernel SELinux flaw involving overlayfs mmap() and mprotect() access-control checks.
A named vulnerability addressed by the referenced Red Hat Enterprise Linux kernel-package update; technical flaw details are not provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.