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CVE-2021-47069 is a race-related use-after-free condition in Linux kernel IPC handling for POSIX message queues, System V message queues, and semaphores. A receiver can place an extended wait-queue structure allocated on its stack into a wait queue. A concurrent sender or wake-up path can mark that structure ready, allowing the receiver to return and invalidate the stack object, then subsequently dereference the stale structure while attempting to wake the receiving task. The affected paths include POSIX message-queue send/receive handling, with analogous conditions in System V message and semaphore wake-up processing.
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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.
Linux kernel IPC message-queue and semaphore issue involving reliance on an expired stack reference.
Linux kernel IPC flaw involving use of a stack reference after its lifetime expires.
A Linux kernel IPC lifetime-management flaw involving use of an expired stack reference.
Linux kernel IPC stack-reference lifetime vulnerability.
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.