CVE-2025-37865

VLAN deletion failure via uninitialized MST identifier

Published May 9, 2025 · Updated May 11, 2026

Use of uninitialized data in Linux allows local users to cause bridge VLAN deletion to fail on affected mv88e6xxx switches. Some vtu_getnext implementations leave vlan.sid unset, so mv88e6xxx_port_vlan_leave passes residual stack data to mv88e6xxx_mst_put as an MST identifier. The path is reached when deleting a bridge VLAN from a user port on hardware without MST support, causing ENOENT instead of completing the deletion.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of uninitialized data in Linux allows local users to cause bridge VLAN deletion to fail on affected mv88e6xxx switches. Some vtu_getnext implementations leave vlan.sid unset, so mv88e6xxx_port_vlan_leave passes residual stack data to mv88e6xxx_mst_put as an MST identifier. The path is reached when deleting a bridge VLAN from a user port on hardware without MST support, causing ENOENT instead of completing the deletion.

The record

CVE
CVE-2025-37865
Published
May 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.18
  2. Affected versionversion=acaf4d2e36b3466334af4d3ee6ac254c3316165c <35cde75c08a1fa1a5ac0467afe2709caceeef002
  3. Affected versionversion=acaf4d2e36b3466334af4d3ee6ac254c3316165c <9da4acbd60664271d34a627f7f63cd5bad8eba74
  4. Affected versionversion=acaf4d2e36b3466334af4d3ee6ac254c3316165c <9ee6d3a368ed34f2457863da3085c676e9e37a3d
  5. Affected versionversion=acaf4d2e36b3466334af4d3ee6ac254c3316165c <afae9087301471970254a9180e5a26d3d8e8af09
  6. Affected versionversion=acaf4d2e36b3466334af4d3ee6ac254c3316165c <ea08dfc35f83cfc73493c52f63ae4f2e29edfe8d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=acaf4d2e36b3466334af4d3ee6ac254c3316165c <35cde75c08a1fa1a5ac0467afe2709caceeef002; version=acaf4d2e36b3466334af4d3ee6ac254c3316165c <9da4acbd60664271d34a627f7f63cd5bad8eba74; version=acaf4d2e36b3466334af4d3ee6ac254c3316165c <9ee6d3a368ed34f2457863da3085c676e9e37a3d; version=acaf4d2e36b3466334af4d3ee6ac254c3316165c <afae9087301471970254a9180e5a26d3d8e8af09; version=acaf4d2e36b3466334af4d3ee6ac254c3316165c <ea08dfc35f83cfc73493c52f63ae4f2e29edfe8d

Published CVSS scores

5.5NIST NVDCVSS: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

CWE-908Use of Uninitialized Resource

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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