CVE-2026-81003

Data injection and service interruption via cross-device matching

Published Sep 11, 2026 · Updated Sep 11, 2026

Improper frame filtering in Linux AF_IUCV allows attackers to inject data and interrupt socket service through crafted frames. afiucv_hs_rcv() matches four plaintext transport-header names but fails to require that a socket's bound hs_dev equals the frame's ingress device. Reachability requires either a peer on the same HiperSockets segment or CAP_NET_RAW in an unprivileged user and network namespace; consequences include spoofed peers, queue exhaustion, unusable accepted sockets, injected data, and terminated connections.

CVSS severityUnavailable
Unscored
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper frame filtering in Linux AF_IUCV allows attackers to inject data and interrupt socket service through crafted frames. afiucv_hs_rcv() matches four plaintext transport-header names but fails to require that a socket's bound hs_dev equals the frame's ingress device. Reachability requires either a peer on the same HiperSockets segment or CAP_NET_RAW in an unprivileged user and network namespace; consequences include spoofed peers, queue exhaustion, unusable accepted sockets, injected data, and terminated connections.

The record

CVE
CVE-2026-81003
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=3.2
  2. Affected versionversion=3881ac441f642d56503818123446f7298442236b <80230a18c164a4b5bbc048fe2768b219ac17bc5a
  3. Affected versionversion=3881ac441f642d56503818123446f7298442236b <8e3763f1ccac3fc395f9af2b87114c023ced8a3f
  4. Affected versionversion=3881ac441f642d56503818123446f7298442236b <a7f0130a091724e69827ab58e74777a88747e892
  5. Affected versionversion=3881ac441f642d56503818123446f7298442236b <dfac2936b83be00035ae176f8252e1c1e1de9207

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=3881ac441f642d56503818123446f7298442236b <80230a18c164a4b5bbc048fe2768b219ac17bc5a; version=3881ac441f642d56503818123446f7298442236b <8e3763f1ccac3fc395f9af2b87114c023ced8a3f; version=3881ac441f642d56503818123446f7298442236b <a7f0130a091724e69827ab58e74777a88747e892; version=3881ac441f642d56503818123446f7298442236b <dfac2936b83be00035ae176f8252e1c1e1de9207

Published CVSS scores

No CVSS assessment is available in this record.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo