CVE-2026-72381Network attack vector

Freed-memory read via durable reconnect race

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux ksmbd allows remote attackers to trigger a freed-memory read through concurrent SMB2 durable reconnects. An unlocked strcmp in ksmbd_vfs_compare_durable_owner reads fp->owner.name while ksmbd_reopen_durable_fd can free that independent buffer. Reachability requires a running ksmbd server and two overlapping durable reconnects for the same persistent identifier, exposing kernel memory to an unsafe read.

CVSS severity4.2
Medium
EPSS probability0.64%
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 Linux ksmbd allows remote attackers to trigger a freed-memory read through concurrent SMB2 durable reconnects. An unlocked strcmp in ksmbd_vfs_compare_durable_owner reads fp->owner.name while ksmbd_reopen_durable_fd can free that independent buffer. Reachability requires a running ksmbd server and two overlapping durable reconnects for the same persistent identifier, exposing kernel memory to an unsafe read.

The record

CVE
CVE-2026-72381
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, CWE-416, T1499.004
Attack vector
network
Privileges
Unavailable

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=00ce8d6789dae72d042a4522264964c72891ca37 <5a5ac2852cd326529d02f778bc1aa6184701f4d7
  2. Affected versionversion=49110a8ce654bbe56bef7c5e44cce31f4b102b8a <38637163501fd9e2f684b8cd275d0db5d79f37c6
  3. Affected versionversion=49110a8ce654bbe56bef7c5e44cce31f4b102b8a <ed98719be41389d416953b8ef9f07a07dfea6b2b
  4. Affected versionversion=6.12.92 <6.12.97
  5. Affected versionversion=6.18.25 <6.18.40
  6. Affected versionversion=6.6.142 <6.6.145
  7. Affected versionversion=7.0.2 <7.1
  8. Affected versionversion=7.1
  9. Affected versionversion=712cdf917e77a6444ce3836874829d770db20ee6 <fb978d72052704c6b06c6b0f129fcd60b77169f5
  10. Affected versionversion=c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d <93d4d46bf9d442a12ea87278049ec416962c627f
  11. Affected versionversion=c908c853f304a4969b5aa10eba0b50350cc65b80

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=00ce8d6789dae72d042a4522264964c72891ca37 <5a5ac2852cd326529d02f778bc1aa6184701f4d7; version=49110a8ce654bbe56bef7c5e44cce31f4b102b8a <38637163501fd9e2f684b8cd275d0db5d79f37c6; version=49110a8ce654bbe56bef7c5e44cce31f4b102b8a <ed98719be41389d416953b8ef9f07a07dfea6b2b; version=6.12.92 <6.12.97; version=6.18.25 <6.18.40; version=6.6.142 <6.6.145; version=7.0.2 <7.1; version=7.1; version=712cdf917e77a6444ce3836874829d770db20ee6 <fb978d72052704c6b06c6b0f129fcd60b77169f5; version=c7f0f0d01c88bdcb8b1694d7d321670013f7ed7d <93d4d46bf9d442a12ea87278049ec416962c627f; version=c908c853f304a4969b5aa10eba0b50350cc65b80

Published CVSS scores

4.2Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free
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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