CVE-2023-0881Public exploitNetwork attack vector

Kernel crash via inverted nftables set lookup

Published Mar 31, 2025 · Updated Mar 31, 2025

Denial of service in Canonical linux-bluefield 5.4.0-1001.2 through 5.4.0-1057.63 allows remote attackers to crash the kernel via TCP port 22. The nft_lookup_eval path updates a stateful expression during an inverted nftables set lookup, although the backported lookup change lacks the required bitmap-extension initialization and inverted-lookup guard. A reachable SSH service plus the documented nftables set syntax for TCP port 22 lets an unauthenticated packet flood crash the BlueField DPU, interrupting service.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Canonical linux-bluefield 5.4.0-1001.2 through 5.4.0-1057.63 allows remote attackers to crash the kernel via TCP port 22. The nft_lookup_eval path updates a stateful expression during an inverted nftables set lookup, although the backported lookup change lacks the required bitmap-extension initialization and inverted-lookup guard. A reachable SSH service plus the documented nftables set syntax for TCP port 22 lets an unauthenticated packet flood crash the BlueField DPU, interrupting service.

The record

CVE
CVE-2023-0881
Published
Mar 31, 2025
Updated
Mar 31, 2025
Vendor
Canonical
Product
linux-bluefield
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2025Record 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=5.4.0-1001.2 <5.4.0-1058.64

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Canonical · linux-bluefieldversion=5.4.0-1001.2 <5.4.0-1058.64

Published CVSS scores

7.5CanonicalCVSS:3.1/AV:N/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

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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