CVE-2026-43114Network attack vectorHinoki check available

Firewall bypass via stale AVX2 match bits

Published May 6, 2026 · Updated Aug 26, 2026

Incorrect nftables matching in affected Linux kernels allows remote attackers to bypass firewall policy via crafted packet keys. The AVX2 PIPAPO match functions return before consuming the final field, leaving stale map bits that can select an entry matching only the first field. Reachability requires an AVX2 concatenated or interval set with expired or inactive entries; false matches can admit unauthorized traffic or reject valid set updates.

CVSS severity9.4
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect nftables matching in affected Linux kernels allows remote attackers to bypass firewall policy via crafted packet keys. The AVX2 PIPAPO match functions return before consuming the final field, leaving stale map bits that can select an entry matching only the first field. Reachability requires an AVX2 concatenated or interval set with expired or inactive entries; false matches can admit unauthorized traffic or reject valid set updates.

The record

CVE
CVE-2026-43114
Published
May 6, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=5.7
  2. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <07de44424bb7f17ef9357e8535df96d9e97c40cb
  3. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <0abbc43f71d99baadeeba6fa3fe1c80b676f57ed
  4. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <1c43f0dd8691ddf8884793b481ddc7511cf593c3
  5. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <3d53f9aafd469ae1ea27051e00f5b96ca1b55d52
  6. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <c7babe2f28b507e17f28e9f753b7caec72d4857f
  7. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <d3c0037ffe1273fa1961e779ff6906234d6cf53c
  8. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <f8c39983fc9c1a978c82e6f2df7bfba8a8561587
  9. Affected versionversion=7400b063969bdca4a06cd97f1294d765c8eecbe1 <fa4f1f52528c73989d820f32bfca06bec5afeece

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <07de44424bb7f17ef9357e8535df96d9e97c40cb; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <0abbc43f71d99baadeeba6fa3fe1c80b676f57ed; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <1c43f0dd8691ddf8884793b481ddc7511cf593c3; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <3d53f9aafd469ae1ea27051e00f5b96ca1b55d52; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <c7babe2f28b507e17f28e9f753b7caec72d4857f; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <d3c0037ffe1273fa1961e779ff6906234d6cf53c; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <f8c39983fc9c1a978c82e6f2df7bfba8a8561587; version=7400b063969bdca4a06cd97f1294d765c8eecbe1 <fa4f1f52528c73989d820f32bfca06bec5afeece
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.4Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
8.1UbuntuCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
6.3UbuntuCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

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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