CVE-2026-80987
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
In the Linux kernel, the NTB ntb_transport module's ntb_process_tx() handles an oversized buffer by calling tx_handler() with a NULL data pointer and returning success. ntb_netdev therefore neither frees the skb in its completion callback nor takes its enqueue error path, leaking it. The fix rejects oversized buffers in ntb_transport_tx_enqueue() before acquiring a queue entry and returns -EMSGSIZE.
Risk Assessment
Leaking skb buffers on oversized packet transmission leads to gradual kernel memory exhaustion and may eventually cause system crashes or denial of NTB networking functionality.
Recommendation
Update the Linux kernel to a version containing the fix. Monitor memory usage on systems using NTB ntb_transport.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: NTB: ntb_transport: Reject oversized TX buffers ntb_process_tx() handles an oversized buffer by calling tx_handler() with a NULL data pointer and returning success. ntb_netdev therefore neither frees the skb in its completion callback nor takes its enqueue error path, leaking it. Reject oversized buffers in ntb_transport_tx_enqueue() before acquiring a queue entry and return -EMSGSIZE. The caller retains ownership of the buffer, and the preceding netdev patch frees the skb when enqueue returns this permanent error.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS