---
id: CVE-2026-90107
title: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free pending qentry in smc_llc_flow_stop() before memset\n\nsmc_llc_flow_stop() resets a flow struct with a blind memset:\n\n\tspin_lock_bh(&lgr->llc_flow_lock);\n\tm…"
summary: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free pending qentry in smc_llc_flow_stop() before memset\n\nsmc_llc_flow_stop() resets a flow struct with a blind memset:\n\n\tspin_lock_bh(&lgr->llc_flow_lock);\n\tm…"
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    8e3deb150a5237b672c4579e69a6deb02027dbed
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    11bc373ee6630709f0c2da2e7860c23d503c9e9d
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    032aec7d03c9102616b98fea74f8f7145e7f867c
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    957dba2b8b5aebfe09caa6a6b22b958079082eab
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    f03aa5d36ae3c4068a1c3885146be99aa7fd9307
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    0879ea157acc1ac6752f6fcb755d1f91a2359238
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    5ff429dd6725fa6c1e17a4ed0be8ab675f67a98b
  - >-
    Linux >= 555da9af827d95134656fa459c8f3ece04dd867a <
    5ee0ceddc7785c6dcf4a8107fef01f0414a354f4
  - Linux 5.8
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:02.570'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90107'
references:
  - url: 'https://git.kernel.org/stable/c/032aec7d03c9102616b98fea74f8f7145e7f867c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0879ea157acc1ac6752f6fcb755d1f91a2359238'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/11bc373ee6630709f0c2da2e7860c23d503c9e9d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5ee0ceddc7785c6dcf4a8107fef01f0414a354f4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5ff429dd6725fa6c1e17a4ed0be8ab675f67a98b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8e3deb150a5237b672c4579e69a6deb02027dbed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/957dba2b8b5aebfe09caa6a6b22b958079082eab'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f03aa5d36ae3c4068a1c3885146be99aa7fd9307'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.888Z'
epss: 0.00211
epssPercentile: 0.11607
---

## Overview

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

net/smc: free pending qentry in smc_llc_flow_stop() before memset

smc_llc_flow_stop() resets a flow struct with a blind memset:

	spin_lock_bh(&lgr->llc_flow_lock);
	memset(flow, 0, sizeof(*flow));
	flow->type = SMC_LLC_FLOW_NONE;
	spin_unlock_bh(&lgr->llc_flow_lock);

If flow->qentry is non-NULL at this point the pointer is overwritten without the
allocation being freed, leaking one kmalloc object.

A late-arriving duplicate CONFIRM_LINK or ADD_LINK_CONT message can set
flow->qentry after the legitimate message has been consumed by the waiter via
smc_llc_flow_qentry_clr() (which NULLs the pointer but leaves flow->type
non-zero) but before the flow completes and smc_llc_flow_stop() runs.  In that
window the duplicate is stashed into flow->qentry, and then lost when
smc_llc_flow_stop() zeros the struct.

Call smc_llc_flow_qentry_del() inside the lock before the memset.
smc_llc_flow_qentry_del() already checks flow->qentry before freeing, so the
normal case where no entry is pending is a no-op.

## Remediation

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