CVE-2024-56656Network attack vector

Kernel memory corruption via oversized aggregation ID

Published Dec 27, 2024 · Updated Aug 5, 2026

Out-of-bounds access in Linux 6.8 through 6.12.5 allows remote attackers to corrupt kernel memory via VLAN-tagged GRO traffic. The bnxt_en driver applies a 16-bit mask to a 12-bit P7 completion-field aggregation ID, so VLAN metadata bits select entries beyond the TPA maps and supply invalid packet-header state. The path requires a 5760X-class adapter with hardware GRO and VLAN receive handling active and exposes kernel heap data, memory integrity, and host availability before authentication.

CVSS severity9.8
Critical
EPSS probability0.37%
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 Linux 6.8 through 6.12.5 allows remote attackers to corrupt kernel memory via VLAN-tagged GRO traffic. The bnxt_en driver applies a 16-bit mask to a 12-bit P7 completion-field aggregation ID, so VLAN metadata bits select entries beyond the TPA maps and supply invalid packet-header state. The path requires a 5760X-class adapter with hardware GRO and VLAN receive handling active and exposes kernel heap data, memory integrity, and host availability before authentication.

The record

CVE
CVE-2024-56656
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=13d2d3d381ee9844f89bd436ab0f44204660027e <24c6843b7393ebc80962b59d7ae71af91bf0dcc1
  2. Affected versionversion=13d2d3d381ee9844f89bd436ab0f44204660027e <fe9274027697c69c1430dc7ee568f82b331ef972
  3. Affected versionversion=6.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=13d2d3d381ee9844f89bd436ab0f44204660027e <24c6843b7393ebc80962b59d7ae71af91bf0dcc1; version=13d2d3d381ee9844f89bd436ab0f44204660027e <fe9274027697c69c1430dc7ee568f82b331ef972; version=6.8

Published CVSS scores

5.5CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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