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CVE-2023-52623 is an improper RCU synchronization issue in the Linux kernel SUNRPC multipath transport code. The rpc_xprt_switch_has_addr() function traverses an RCU-protected transport list, but two of its callers can invoke it without holding an RCU read-side lock. This produces an RCU-list traversal outside a reader section during NFSv4 pNFS data-server connection and write activity. The upstream correction makes rpc_xprt_switch_has_addr() acquire rcu_read_lock() unconditionally; nested RCU read-side locking is supported.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel SUNRPC issue involving suspicious RCU usage.
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.
A Linux kernel SUNRPC/xprtmultipath race-condition issue involving improper RCU list traversal during pNFS/NFS operations. It can cause availability impact, including resource exhaustion, instability, or a crash. Red Hat rates it Low severity (CVSS 5.5); exploitation requires local access and low privileges.
A Linux kernel SUNRPC multipath subsystem flaw involving suspicious/unsafe RCU list traversal in net/sunrpc/xprtmultipath.c. It was observed during pNFS activity against an ONTAP server and can trigger an RCU usage warning. Fixed stable kernel releases are available.
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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.