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CVE-2024-39276 is a reference-count leak in the Linux kernel ext4 filesystem's ext4_xattr_block_cache_find() function. During cache lookup, __entry_find() increments an mb_cache_entry object's e_refcnt. If the subsequent ext4_sb_bread() call returns -ENOMEM, the error path fails to release that reference. The leaked reference can eventually trigger a warning in mb_cache_destroy() during filesystem teardown. The fix releases the acquired reference with mb_cache_entry_put() on the -ENOMEM error path.
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A reference-count leak in the Linux kernel's ext4 extended-attribute block cache. An out-of-memory error path fails to release a cache-entry reference. The fix calls mb_cache_entry_put() on that error path. The advisory rates the vulnerability Medium, with a CVSS v3 base score of 5.5, and recommends updating affected Google Container-Optimized OS kernel packages to version 18514.0.0 or later.
A locally exploitable vulnerability requiring low privileges that can result in high confidentiality impact. The content identifies Unity Linux/UOS Server package inventory as the checked environment but does not name the affected component.
A reference-count leak in the Linux kernel ext4 extended-attribute block cache lookup path.
A CVE referenced by the OpenShift Container Platform 4.17.19 advisory; the content provides no vulnerability-specific description.
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.