CVE-2026-72465
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk48th percentile - higher than 48% of all known CVEs
Summary
In the Linux kernel's xprtrdma subsystem, a vulnerability exists where the reply credit grant is not sanitized before use. A malicious peer can send a reply with an unknown XID and an inflated credit, causing excessive allocation and posting of Receive WRs, exceeding the re_max_requests limit.
Risk Assessment
An attacker can cause excessive memory and resource consumption, potentially leading to resource exhaustion and service disruption.
Recommendation
Apply a Linux kernel update containing the fix that moves the credit clamp immediately after parsing, ensuring all later consumers see a sanitized value.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Sanitize the reply credit grant after parsing The out_norqst exit in rpcrdma_reply_handler() branches away before the credit clamp, so a reply that matches no pending request reaches out_post carrying the raw credit value parsed from the wire. rpcrdma_post_recvs() does not bound its @needed argument: the refill loop allocates and chains Receive WRs until the count is satisfied or allocation fails. A peer that sends a well-formed reply carrying an unknown XID and an inflated credit grant therefore drives rep allocation and Receive posting past re_max_requests on every such reply. Move the clamp to immediately after the credit field is parsed, ahead of the first branch that can reach out_post, so every later consumer sees a sanitized value. The cwnd update stays on the matched-request path.