CVE-2026-80733Public exploitHinoki check available

Kernel warning via non-INET socket fallthrough

Published Sep 3, 2026 · Updated Sep 3, 2026

Improper socket-family handling in the Linux kernel allows local users to trigger a kernel warning through crafted raw packets. In net/core/sock.c, sk_mc_loop() falls through its AF_INET and AF_INET6 switch for an AF_PACKET socket and executes WARN_ON_ONCE(1) instead of returning loopback enabled. Reaching the path requires CAP_NET_RAW and a raw or packet socket over a virtual device such as VRF or ipvlan; the published consequence is a warning, not a documented crash.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper socket-family handling in the Linux kernel allows local users to trigger a kernel warning through crafted raw packets. In net/core/sock.c, sk_mc_loop() falls through its AF_INET and AF_INET6 switch for an AF_PACKET socket and executes WARN_ON_ONCE(1) instead of returning loopback enabled. Reaching the path requires CAP_NET_RAW and a raw or packet socket over a virtual device such as VRF or ipvlan; the published consequence is a warning, not a documented crash.

The record

CVE
CVE-2026-80733
Published
Sep 3, 2026
Updated
Sep 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 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=3.14.40 <3.15
  2. Affected versionversion=3.18.13 <3.19
  3. Affected versionversion=3.19.6 <3.20
  4. Affected versionversion=3fe207e4637a2e792c46a08666aa722f77d7f8f7
  5. Affected versionversion=4.0
  6. Affected versionversion=c8c30b2b17f2133e953850c547e3902c3a3d80e2
  7. Affected versionversion=c91f81773cd4bbebfe744e9ab30a7ce093f9b930
  8. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f
  9. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <97133c4d42654578fab95abe47359ebe784dde18
  10. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe
  11. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <ad7fa2f411cb30f63d6725f111be134064cdb718
  12. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <b8a39a09ae4eaae04309e1e38ed6a1101d967496
  13. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <c8f256dc849205ccb2bd78bd99a3497b972b44e0
  14. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <d2adc4e80b29e58b5162ae09f0f657a215806c8c
  15. Affected versionversion=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <f625c742b33dc137c209dd13d1c5f12b1c18d71c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.14.40 <3.15; version=3.18.13 <3.19; version=3.19.6 <3.20; version=3fe207e4637a2e792c46a08666aa722f77d7f8f7; version=4.0; version=c8c30b2b17f2133e953850c547e3902c3a3d80e2; version=c91f81773cd4bbebfe744e9ab30a7ce093f9b930; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <97133c4d42654578fab95abe47359ebe784dde18; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <ad7fa2f411cb30f63d6725f111be134064cdb718; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <b8a39a09ae4eaae04309e1e38ed6a1101d967496; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <c8f256dc849205ccb2bd78bd99a3497b972b44e0; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <d2adc4e80b29e58b5162ae09f0f657a215806c8c; version=f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90 <f625c742b33dc137c209dd13d1c5f12b1c18d71c

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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Technologies

Your stack

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Your stack

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