CVE-2024-26673

Protected-data disclosure and host crash via malformed expectations

Published Apr 2, 2024 · Updated May 11, 2026

Improper input validation in the nft_ct Netfilter component in Linux allows local users to read protected data or crash the host. nft_ct_expect_obj_init accepts unsupported layer 3 families and layer 4 protocols without ports, then passes those values into connection-tracking expectation creation. Exploitation requires local low-privileged access and a crafted custom nftables expectation; the bounded effects are confidentiality loss and host interruption.

CVSS severity7.1
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in the nft_ct Netfilter component in Linux allows local users to read protected data or crash the host. nft_ct_expect_obj_init accepts unsupported layer 3 families and layer 4 protocols without ports, then passes those values into connection-tracking expectation creation. Exploitation requires local low-privileged access and a crafted custom nftables expectation; the bounded effects are confidentiality loss and host interruption.

The record

CVE
CVE-2024-26673
Published
Apr 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 2, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.3
  2. Affected versionversion=857b46027d6f91150797295752581b7155b9d0e1 <0f501dae16b7099e69ee9b0d5c70b8f40fd30e98
  3. Affected versionversion=857b46027d6f91150797295752581b7155b9d0e1 <38cc1605338d99205a263707f4dde76408d3e0e8
  4. Affected versionversion=857b46027d6f91150797295752581b7155b9d0e1 <65ee90efc928410c6f73b3d2e0afdd762652c09d
  5. Affected versionversion=857b46027d6f91150797295752581b7155b9d0e1 <8059918a1377f2f1fff06af4f5a4ed3d5acd6bc4
  6. Affected versionversion=857b46027d6f91150797295752581b7155b9d0e1 <b775ced05489f4b77a35fe203e9aeb22f428e38f
  7. Affected versionversion=857b46027d6f91150797295752581b7155b9d0e1 <cfe3550ea5df292c9e2d608e8c4560032391847e
  8. Affected versionversion=857b46027d6f91150797295752581b7155b9d0e1 <f549f340c91f08b938d60266e792ff7748dae483

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=857b46027d6f91150797295752581b7155b9d0e1 <0f501dae16b7099e69ee9b0d5c70b8f40fd30e98; version=857b46027d6f91150797295752581b7155b9d0e1 <38cc1605338d99205a263707f4dde76408d3e0e8; version=857b46027d6f91150797295752581b7155b9d0e1 <65ee90efc928410c6f73b3d2e0afdd762652c09d; version=857b46027d6f91150797295752581b7155b9d0e1 <8059918a1377f2f1fff06af4f5a4ed3d5acd6bc4; version=857b46027d6f91150797295752581b7155b9d0e1 <b775ced05489f4b77a35fe203e9aeb22f428e38f; version=857b46027d6f91150797295752581b7155b9d0e1 <cfe3550ea5df292c9e2d608e8c4560032391847e; version=857b46027d6f91150797295752581b7155b9d0e1 <f549f340c91f08b938d60266e792ff7748dae483

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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)
Vectorlocal
Privilegesauthenticated
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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