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CVE-2022-49977 is a flaw in the Linux kernel ftrace subsystem. If ftrace_startup_enable() fails after an ftrace operation has been added to ftrace_ops_list, ftrace is marked disabled but the failed operation is not removed from the list. Subsequent unregistration returns early while ftrace is disabled, leaving a stale list entry. If the dynamically allocated ftrace operation is then freed, is_ftrace_trampoline() can dereference the invalid or NULL operation while iterating ftrace_ops_list, causing a kernel NULL-pointer dereference.
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No public exploit code observed for this vulnerability.
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13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A NULL-pointer dereference in the Linux kernel ftrace is_ftrace_trampoline path when ftrace is inactive.
NULL-pointer dereference in Linux kernel ftrace's is_ftrace_trampoline when ftrace is unavailable or dead.
A NULL-pointer dereference in the Linux kernel ftrace is_ftrace_trampoline path when ftrace is dead.
A NULL-pointer dereference in the Linux kernel ftrace is_ftrace_trampoline path when ftrace is dead.
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.