Kernel-address disclosure via uninitialized expectation ID
Published Aug 30, 2024 · Updated May 23, 2026
Information disclosure in Linux netfilter ctnetlink allows local users to read a kernel-address bit when deleting an expectation. The ctnetlink delete-expectation path returns an expectation identifier without first calling nf_expect_get_id(), leaving its low bit derived from the expectation object's address. Exploitation requires low-privileged local access and reveals only the address's least significant bit through userspace output.
Summary
What happened
Information disclosure in Linux netfilter ctnetlink allows local users to read a kernel-address bit when deleting an expectation. The ctnetlink delete-expectation path returns an expectation identifier without first calling nf_expect_get_id(), leaving its low bit derived from the expectation object's address. Exploitation requires low-privileged local access and reveals only the address's least significant bit through userspace output.
The record
- CVE
- CVE-2024-44944
- Published
- Aug 30, 2024
- Updated
- May 23, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-401
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 30, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 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?
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- Affected versionversion=V3.1.0 <V3.1.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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