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CVE-2025-21855 is a use-after-free vulnerability in the Linux kernel IBM Virtual Network Interface Controller (ibmvnic) driver. After transmitting a buffer to the Virtual I/O Server (VIOS), the ibmvnic_xmit transmit path reads the socket-buffer length to update transmit-byte statistics. VIOS may asynchronously trigger an interrupt that frees the socket buffer before that read occurs, resulting in a race-driven read from freed memory. The condition was observed by KASAN as a slab use-after-free and is particularly likely during Live Partition Mobility (LPM).
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No public exploit code observed for this vulnerability.
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Linux kernel IBM virtual NIC use-after-send flaw.
A Linux kernel ibmvnic network-driver use-after-free caused by dereferencing an skb after its transmit buffer has been sent to VIOS, which may asynchronously free the skb.
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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.