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CVE-2023-52623 is a race-condition flaw in the Linux kernel SUNRPC subsystem. The rpc_xprt_switch_has_addr() function traverses an RCU-protected list, but two of its three callers can invoke it without first acquiring rcu_read_lock(). This produces an "RCU-list traversed in non-reader section" lockdep warning during NFSv4 pNFS activity, including transport multipathing and data-server connection operations. The upstream fix makes rpc_xprt_switch_has_addr() unconditionally acquire the RCU read lock; recursive RCU read-side locking is safe for callers that already hold it.
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6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel SUNRPC/pNFS flaw causing suspicious RCU usage during RPC transport multipath handling. It can affect system availability and is addressed by updated Google COS kernel packages.
Linux kernel SUNRPC issue involving suspicious RCU usage.
Unknown
A low-severity Linux kernel SUNRPC vulnerability involving a suspicious RCU usage warning. It was resolved in upstream/stable Linux kernel releases and subsequently addressed in Red Hat Enterprise Linux advisories.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.