CVE-2026-53010Network attack vector

Remote memory corruption via premature durable-handle release

Published Jun 24, 2026 · Updated Jun 24, 2026

Use-after-free in the ksmbd SMB server in Linux Kernel allows remote attackers to corrupt kernel memory during durable reconnect. smb2_open calls ksmbd_put_durable_fd too early, then accesses the released file object after a later error or concurrent scavenger action. A client must reach the SMB durable-reconnect path through a valid session and tree connection, although guest or anonymous access to a shared tree can satisfy that gate; no public source confirms code execution.

CVSS severity9.8
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the ksmbd SMB server in Linux Kernel allows remote attackers to corrupt kernel memory during durable reconnect. smb2_open calls ksmbd_put_durable_fd too early, then accesses the released file object after a later error or concurrent scavenger action. A client must reach the SMB durable-reconnect path through a valid session and tree connection, although guest or anonymous access to a shared tree can satisfy that gate; no public source confirms code execution.

The record

CVE
CVE-2026-53010
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=6.6.32 <6.7
  2. Affected versionversion=6.9
  3. Affected versionversion=8df4bcdb0a4232192b2445256c39b787d58ef14d
  4. Affected versionversion=c8efcc786146a951091588e5fa7e3c754850cb3c <1baff47b81f94f9231c91236aa511420d0e266b9
  5. Affected versionversion=c8efcc786146a951091588e5fa7e3c754850cb3c <97a0cd55283b4e63fd92804da91c8d9896adcad9
  6. Affected versionversion=c8efcc786146a951091588e5fa7e3c754850cb3c <ce2e164c1c51c3f7813b80f8c926836e896bcbb3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.6.32 <6.7; version=6.9; version=8df4bcdb0a4232192b2445256c39b787d58ef14d; version=c8efcc786146a951091588e5fa7e3c754850cb3c <1baff47b81f94f9231c91236aa511420d0e266b9; version=c8efcc786146a951091588e5fa7e3c754850cb3c <97a0cd55283b4e63fd92804da91c8d9896adcad9; version=c8efcc786146a951091588e5fa7e3c754850cb3c <ce2e164c1c51c3f7813b80f8c926836e896bcbb3

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1190Exploit Public-Facing Application

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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