CVE-2026-74631
N/AIn 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.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
—EPSS not yet scored
Impact if exploited
—CVSS · not scored
- No impact metrics
Proof of concept & exploit code
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curl -s https://vulnpedia.com/cve/CVE-2026-74631/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-74631/poc.json
References
Technical & other
- https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b
- https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8
- https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5
- https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0
- https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d
- https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e