CVE-2026-74608Network attack vector

Kernel code execution via SMB interface use-after-free

Published Aug 22, 2026 · Updated Aug 25, 2026

Use-after-free in the Linux SMB client in affected Linux kernels allows remote attackers to crash or execute code via SMB3 multichannel traffic. In cifs_try_adding_channels(), a failed channel addition drops the temporary interface reference before incrementing iface->weight_fulfilled, so a concurrent list refresh can free the object before that write. An SMB3 multichannel session with an attacker-controlled or compromised server must exist; exploitation can corrupt kernel memory or panic the host.

CVSS severity9.8
Critical
EPSS probability0.48%
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 Linux SMB client in affected Linux kernels allows remote attackers to crash or execute code via SMB3 multichannel traffic. In cifs_try_adding_channels(), a failed channel addition drops the temporary interface reference before incrementing iface->weight_fulfilled, so a concurrent list refresh can free the object before that write. An SMB3 multichannel session with an attacker-controlled or compromised server must exist; exploitation can corrupt kernel memory or panic the host.

The record

CVE
CVE-2026-74608
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=22a6c5b3425f327e7f4c3606a72277dce82c7d83
  2. Affected versionversion=6.1.78 <6.1.183
  3. Affected versionversion=6.6.17 <6.6.152
  4. Affected versionversion=6.7.5 <6.8
  5. Affected versionversion=6.8
  6. Affected versionversion=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805
  7. Affected versionversion=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <1ffacbadc14530e55b8d86f7b917524f6a0fb891
  8. Affected versionversion=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <47dfac48bce7198ad4f1a388fc8c9491f878ac3b
  9. Affected versionversion=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <4986410316b1ae0e63c6ce418e4eb196723626e7
  10. Affected versionversion=cbc53148cc0946b72d62a3c53870cb22ce4ec284 <64d7584e62ac8cdc750455c5fdc6008fc2de4f06
  11. Affected versionversion=cff97d683a083b862a8bb24309e0f4d2d928128a <c292d4686f717c03e5022fc4ae7c782f39a94915

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=22a6c5b3425f327e7f4c3606a72277dce82c7d83; version=6.1.78 <6.1.183; version=6.6.17 <6.6.152; version=6.7.5 <6.8; version=6.8; version=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <1305eadc6a7d78a8d0a52eee29ddd2d9e8a27805; version=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <1ffacbadc14530e55b8d86f7b917524f6a0fb891; version=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <47dfac48bce7198ad4f1a388fc8c9491f878ac3b; version=6aac002bcfd554aff6d3ebb55e1660d078d70ab0 <4986410316b1ae0e63c6ce418e4eb196723626e7; version=cbc53148cc0946b72d62a3c53870cb22ce4ec284 <64d7584e62ac8cdc750455c5fdc6008fc2de4f06; version=cff97d683a083b862a8bb24309e0f4d2d928128a <c292d4686f717c03e5022fc4ae7c782f39a94915

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0OracleCVSS:3.1/AV:L/AC:H/PR:L/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-825Expired Pointer Dereference
T1203Exploitation for Client Execution

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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