CVE-2026-74631

CVE-2026-74631 · net: smc: fix splice entry lifetime imbalance in smc_rx_splice

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In the Linux kernel, the following vulnerability has been resolved: net: smc: fix splice entry lifetime imbalance in smc_rx_splice smc_rx_splice() passes pages to splice_to_pipe() before taking the references that cover the lifetime of each splice entry. In the VM-backed RMB path, splice_to_pipe() may drop unqueued entries through smc_rx_spd_release(), while queued entries are released later via the pipe buffer callback. The old post-splice accounting also derives the number of queued VM pages from an offset mutated while building the descriptor, and a multi-page splice pairs one sock_hold() with multiple sock_put() calls. Take the page and socket references for every candidate entry before splice_to_pipe(), and drop the matching private state, page reference, and socket reference from smc_rx_spd_release() for entries that never get queued. This fixes a refcount imbalance that can underflow page refcounts and trigger a use-after-free.

CVSS 8.4 · Élevée · EPSS 0,1% · Correctif disponible

Publication

2026-08-22T15:32:12.334Z

Mise à jour

2026-10-16T19:06:03.774Z

Pile logicielle: system

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