CVE-2024-40999Network attack vector

Kernel memory corruption via misframed RX descriptors

Published Jul 12, 2024 · Updated Aug 5, 2026

Memory corruption in the Linux ENA receive path before 6.9.7 allows remote attackers to crash the kernel via multi-buffer traffic. The ena_com_cdesc_rx_pkt_get function fails to reject a second FIRST flag within one packet, so ena_com_rx_pkt merges unrelated descriptor chains and can reuse stale pages or overrun buffer bounds. Exploitation requires an active ENA interface receiving attacker-controlled large or scattered packets and can corrupt kernel memory, disclose data, or interrupt networking.

CVSS severity9.8
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux ENA receive path before 6.9.7 allows remote attackers to crash the kernel via multi-buffer traffic. The ena_com_cdesc_rx_pkt_get function fails to reject a second FIRST flag within one packet, so ena_com_rx_pkt merges unrelated descriptor chains and can reuse stale pages or overrun buffer bounds. Exploitation requires an active ENA interface receiving attacker-controlled large or scattered packets and can corrupt kernel memory, disclose data, or interrupt networking.

The record

CVE
CVE-2024-40999
Published
Jul 12, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 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=1738cd3ed342294360d6a74d4e58800004bff854 <42146ee5286f16f1674a84f7c274dcca65c6ff2e
  2. Affected versionversion=1738cd3ed342294360d6a74d4e58800004bff854 <b37b98a3a0c1198bafe8c2d9ce0bc845b4e7a9a7
  3. Affected versionversion=4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1738cd3ed342294360d6a74d4e58800004bff854 <42146ee5286f16f1674a84f7c274dcca65c6ff2e; version=1738cd3ed342294360d6a74d4e58800004bff854 <b37b98a3a0c1198bafe8c2d9ce0bc845b4e7a9a7; version=4.9

Published CVSS scores

9.8Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

T1499Endpoint Denial of Service

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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