---
id: CVE-2026-74719
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in
  smc_llc_event_handler()


  The SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in

  smc_llc_event_ha…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in
  smc_llc_event_handler()


  The SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in

  smc_llc_event_ha…
severity: none
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-2026-74719'
references:
  - url: 'https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.0022
epssPercentile: 0.11527
ingestedAt: '2026-10-14T13:30:58.547Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()

The SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in
smc_llc_event_handler() stores an incoming qentry into the local LLC flow
without first checking whether a qentry is already pending. If a malicious or
buggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is
active and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the
pointer without freeing the previous allocation, leaking one kmalloc-96 object
per spurious message.

The sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry
guard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a
duplicate message when qentry is already occupied falls through to break and is
freed by the kfree(qentry) at the out: label, rather than silently leaking the
existing allocation.

The response direction (smc_llc_rx_response()) is unaffected: it already guards
with flow->qentry at the equivalent site and drops duplicate responses
correctly.

## Remediation

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