CVE-2024-26822

Cross-user SMB access via inherited automount credentials

Published Apr 17, 2024 · Updated Aug 5, 2026

Credential misassignment in affected Linux kernel releases allows local users to access DFS submounts under another user’s identity. In fs/smb/client/namespace.c, automount context creation reuses a parent mount’s uid, gid, and cruid instead of setting the traversing user’s credentials. Exploitation requires a local account with access to an existing multiuser CIFS mount and permits SMB reads or writes authorized to the inherited identity.

CVSS severity8.7
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential misassignment in affected Linux kernel releases allows local users to access DFS submounts under another user’s identity. In fs/smb/client/namespace.c, automount context creation reuses a parent mount’s uid, gid, and cruid instead of setting the traversing user’s credentials. Exploitation requires a local account with access to an existing multiuser CIFS mount and permits SMB reads or writes authorized to the inherited identity.

The record

CVE
CVE-2024-26822
Published
Apr 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1078
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.15.124 <5.15.201
  2. Affected versionversion=60e3318e3e900ba1ddfead937012b3432dfccc92 <2ceba8ae1bd1f5589548cb722a5c583ca3a2dede
  3. Affected versionversion=6.1.54 <6.1.164
  4. Affected versionversion=6.2
  5. Affected versionversion=9fd29a5bae6e8f94b410374099a6fddb253d2d5f <4508ec17357094e2075f334948393ddedbb75157
  6. Affected versionversion=9fd29a5bae6e8f94b410374099a6fddb253d2d5f <7590ba9057c6d74c66f3b909a383ec47cd2f27fb
  7. Affected versionversion=9fd29a5bae6e8f94b410374099a6fddb253d2d5f <c2aa2718cda2d56b4a551cb40043e9abc9684626
  8. Affected versionversion=c8117ac42303f7ae99bbe53e4952f7d147cca1fb <4a6e4c56721a3e6e2550b72ec56aab306c4607a7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15.124 <5.15.201; version=60e3318e3e900ba1ddfead937012b3432dfccc92 <2ceba8ae1bd1f5589548cb722a5c583ca3a2dede; version=6.1.54 <6.1.164; version=6.2; version=9fd29a5bae6e8f94b410374099a6fddb253d2d5f <4508ec17357094e2075f334948393ddedbb75157; version=9fd29a5bae6e8f94b410374099a6fddb253d2d5f <7590ba9057c6d74c66f3b909a383ec47cd2f27fb; version=9fd29a5bae6e8f94b410374099a6fddb253d2d5f <c2aa2718cda2d56b4a551cb40043e9abc9684626; version=c8117ac42303f7ae99bbe53e4952f7d147cca1fb <4a6e4c56721a3e6e2550b72ec56aab306c4607a7

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
8.7LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/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.

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

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

T1078Valid Accounts

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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