---
id: CVE-2026-74631
title: |-
  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…
summary: |-
  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…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
published: '2026-08-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74631'
references:
  - url: 'https://git.kernel.org/stable/c/07ad246529d136d5ef441d5ab4c305d132ff3090'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0b7d54cedea5cb158e21925ae0c6c2f5c87ed2a0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4515c78f4d9fd577270f012efeb062ea58b3682d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5d9686af2976741bbd79b150d1c9e60b81e7f12e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7ddc7af2ae7fc5a0c0635b245c0824c8b76de5cb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/af02c67ce654356c58db20a0bb2db33ace3b07a8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c841789e456ec6751342fa800639ce8e82ff0e6b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ca8342b5fc24c249fdb998468f6a168b457c67e5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.0019
epssPercentile: 0.08055
ingestedAt: '2026-10-14T13:30:58.521Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.