CVE-2026-98173

Kernel memory corruption via SMB interface refresh race

Published Oct 6, 2026 · Updated Oct 6, 2026

Use-after-free in the Linux SMB client allows context-dependent attackers to trigger a stale-pointer dereference during channel setup. In cifs_try_adding_channels(), the iterator retains an unreferenced interface-list pointer while dropping iface_lock; a concurrent refresh can free that entry before iteration resumes. The race requires channel creation and a simultaneous server-interface refresh; the published record does not establish reliable code execution or data disclosure.

CVSS severityUnavailable
Unscored
EPSS probability0.33%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux SMB client allows context-dependent attackers to trigger a stale-pointer dereference during channel setup. In cifs_try_adding_channels(), the iterator retains an unreferenced interface-list pointer while dropping iface_lock; a concurrent refresh can free that entry before iteration resumes. The race requires channel creation and a simultaneous server-interface refresh; the published record does not establish reliable code execution or data disclosure.

The record

CVE
CVE-2026-98173
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.19
  2. Affected versionversion=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <c941f1ebfd26f683de81091473f3596a218abff0
  3. Affected versionversion=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <d034e836eefd7ce75e588f7031cffbeec594f5ac
  4. Affected versionversion=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <e99040e5e9c60441e6b4725e1a7b88c3106ae903
  5. Affected versionversion=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <ec36b38e65596950e6c29bed7dfc90b98707c19c

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <c941f1ebfd26f683de81091473f3596a218abff0; version=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <d034e836eefd7ce75e588f7031cffbeec594f5ac; version=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <e99040e5e9c60441e6b4725e1a7b88c3106ae903; version=aa45dadd34e44fcd6a9df4b395bee5b5633b4cec <ec36b38e65596950e6c29bed7dfc90b98707c19c

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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