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CVE-2022-1998 is a use-after-free vulnerability in the Linux kernel fanotify subsystem. In copy_event_to_user(), a file descriptor could be installed into the process descriptor table before copy_info_records_to_user() completed. If the latter operation failed, the error-cleanup path released the descriptor and associated file object despite the descriptor-table entry already being visible, leaving a stale entry that could subsequently be used after free. The affected logic was introduced in Linux kernel 5.13; the correction defers fd_install() until the information-copy and remaining operations have succeeded.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel fanotify use-after-free caused by improper fd_install() use.
Linux kernel fanotify file-descriptor handling use-after-free vulnerability.
A Linux kernel fanotify stale file-descriptor flaw introduced in Linux v5.13. Exploitation of the erroneous cleanup path requires CAP_SYS_ADMIN in the initial user namespace, effectively limiting reachability to root-equivalent privileged users.
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.