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CVE-2021-33631 is an integer-overflow or wraparound flaw in the ext4 filesystem implementation of the Linux kernel, associated with ext4_write_inline_data_end(). Mounting a corrupted ext4 filesystem can cause a forced integer overflow during filesystem processing. It affects openEuler kernel streams 4.19.90 before 4.19.90-2401.3 and 5.10.0-60.18.0 before 5.10.0-183.0.0. The upstream fix is present in Linux kernel 6.2.
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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.
Unknown.
A Linux kernel ext4 filesystem flaw involving ext4_write_inline_data_end().
A Linux kernel ext4 filesystem vulnerability involving ext4_write_inline_data_end().
A Linux kernel ext4 filesystem bug in ext4_write_inline_data_end().
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.