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CVE-2021-4037 is an incorrect permission-assignment vulnerability in Linux kernel XFS file creation. It is a regression related to CVE-2018-13405: XFS did not consistently use the generic inode ownership initialization behavior when creating non-directory files in SGID directories. Consequently, a locally writable SGID XFS directory could cause a newly created file to retain the directory group ownership and inherit group-execute and SGID bits even when its creator was not a member of that group. This grants permissions beyond those intended by normal SGID-directory semantics.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Mentioned only in the context of an RHEL 7.9 LTP testcase regression; the advisory does not describe this vulnerability or state that this update addresses it.
Linux kernel security regression related to CVE-2018-13405.
Linux kernel security regression associated with CVE-2018-13405.
Linux kernel security regression affecting the prior fix for CVE-2018-13405.
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.