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CVE-2021-47468 is an improper locking flaw in the Linux kernel mISDN NetJet ISDN driver. During device teardown, the driver could invoke the card ISAC release callback while holding a lock and executing in atomic context. The callback can flush work and therefore sleep, resulting in a “sleeping function called from invalid context” kernel fault. The upstream fix defers the release callback until after the relevant lock has been released.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel mISDN issue in which a sleeping function may be called from an invalid execution context.
Invalid-context sleeping issue in the Linux mISDN subsystem.
Unknown
A Linux kernel mISDN/ISDN flaw involving a sleeping function being called from an invalid execution context. The issue was resolved upstream and subsequently addressed through Red Hat Enterprise Linux 8 advisories.
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.