CVE-2026-74631

Status: UPDATED  |  Advisory ID: CVE-2026-74631

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References