CVE-2025-71112

Host memory disclosure via unchecked VF VLAN ID

Published Jan 14, 2026 · Updated Jan 14, 2026

Out-of-bounds access in the Linux kernel HNS3 PF driver allows guest OS users to expose host memory via a crafted VF VLAN mailbox. The PF mailbox path uses the unvalidated VLAN identifier to access vlan_del_fail_bmap, whose allocation covers only identifiers below VLAN_N_VID. Exploitation requires control of an assigned HNS3 SR-IOV virtual function, and the resulting access occurs in the host kernel.

CVSS severity8.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux kernel HNS3 PF driver allows guest OS users to expose host memory via a crafted VF VLAN mailbox. The PF mailbox path uses the unvalidated VLAN identifier to access vlan_del_fail_bmap, whose allocation covers only identifiers below VLAN_N_VID. Exploitation requires control of an assigned HNS3 SR-IOV virtual function, and the resulting access occurs in the host kernel.

The record

CVE
CVE-2025-71112
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 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=5.3
  2. Affected versionversion=fe4144d47eef8453459c53a34e9d5940a3e6c219 <00e56a7706e10b3d00a258d81fcb85a7e96372d6
  3. Affected versionversion=fe4144d47eef8453459c53a34e9d5940a3e6c219 <6ef935e65902bfed53980ad2754b06a284ea8ac1
  4. Affected versionversion=fe4144d47eef8453459c53a34e9d5940a3e6c219 <91a51d01be5c9f82c12c2921ca5cceaa31b67128
  5. Affected versionversion=fe4144d47eef8453459c53a34e9d5940a3e6c219 <95cca255a7a5ad782639ff0298c2a486707d1046
  6. Affected versionversion=fe4144d47eef8453459c53a34e9d5940a3e6c219 <b7b4f3bf118f51b67691a55b464f04452e5dc6fc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.3; version=fe4144d47eef8453459c53a34e9d5940a3e6c219 <00e56a7706e10b3d00a258d81fcb85a7e96372d6; version=fe4144d47eef8453459c53a34e9d5940a3e6c219 <6ef935e65902bfed53980ad2754b06a284ea8ac1; version=fe4144d47eef8453459c53a34e9d5940a3e6c219 <91a51d01be5c9f82c12c2921ca5cceaa31b67128; version=fe4144d47eef8453459c53a34e9d5940a3e6c219 <95cca255a7a5ad782639ff0298c2a486707d1046; version=fe4144d47eef8453459c53a34e9d5940a3e6c219 <b7b4f3bf118f51b67691a55b464f04452e5dc6fc

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.1NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.0SUSECVSS: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

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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