CVE-2026-72356

SMB I/O interruption via unreleased CIFS credits

Published Aug 15, 2026 · Updated Aug 15, 2026

Denial of service in the Linux kernel CIFS client allows local users to interrupt SMB file access by triggering failed reads. On an error path, cifs_issue_read() retries a subrequest without returning its previously acquired server credits, then overwrites the stored credit count. A local user able to trigger repeated CIFS read failures can exhaust client credits and stall further SMB I/O; no data disclosure or modification is reported.

CVSS severity5.5
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel CIFS client allows local users to interrupt SMB file access by triggering failed reads. On an error path, cifs_issue_read() retries a subrequest without returning its previously acquired server credits, then overwrites the stored credit count. A local user able to trigger repeated CIFS read failures can exhaust client credits and stall further SMB I/O; no data disclosure or modification is reported.

The record

CVE
CVE-2026-72356
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.10
  2. Affected versionversion=69c3c023af25edb5433a2db824d3e7cc328f0183 <3a303f985c6bec8787c2ad4a16b39c14c5bcd765
  3. Affected versionversion=69c3c023af25edb5433a2db824d3e7cc328f0183 <86652704a7fd41a5a8459027e08640bbd1952826
  4. Affected versionversion=69c3c023af25edb5433a2db824d3e7cc328f0183 <b9ee1f0347bf56d019ca28ddff090234bb45b05c
  5. Affected versionversion=69c3c023af25edb5433a2db824d3e7cc328f0183 <c16b8c4cfb4fe2244cc33e469a93c1ab8684146b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=69c3c023af25edb5433a2db824d3e7cc328f0183 <3a303f985c6bec8787c2ad4a16b39c14c5bcd765; version=69c3c023af25edb5433a2db824d3e7cc328f0183 <86652704a7fd41a5a8459027e08640bbd1952826; version=69c3c023af25edb5433a2db824d3e7cc328f0183 <b9ee1f0347bf56d019ca28ddff090234bb45b05c; version=69c3c023af25edb5433a2db824d3e7cc328f0183 <c16b8c4cfb4fe2244cc33e469a93c1ab8684146b

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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