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CVE-2025-22121 is an out-of-bounds read, reported by KASAN as a use-after-free, in the Linux kernel ext4 filesystem implementation. During inode eviction and orphan cleanup, ext4_xattr_delete_inode() can process an inode-resident extended attribute without verifying that the attribute data is valid. This allows ext4_xattr_inode_dec_ref_all() to read invalid or freed memory. The correction validates inode-resident extended attributes through xattr_check_inode(), with validation centralized in ext4_iget_extra_inode() to prevent inconsistent checking across paths.
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No public exploit code observed for this vulnerability.
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8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel ext4 filesystem out-of-bounds read in ext4_xattr_inode_dec_ref_all().
A Linux kernel ext4 out-of-bounds read vulnerability in ext4_xattr_inode_dec_ref_all().
An out-of-bounds read vulnerability in the Linux kernel ext4 filesystem's ext4_xattr_inode_dec_ref_all() function.
An out-of-bounds read flaw in the Linux kernel ext4 filesystem's ext4_xattr_inode_dec_ref_all() function, addressed by the kernel-rt update.
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.