Kernel-data disclosure via uninitialized TCP header
Published Oct 21, 2024 · Updated May 12, 2026
Information disclosure in the Linux kernel allows remote attackers to read uninitialized kernel data from IPv6 TCP reset packets. The nf_reject_ip6_tcphdr_put function appends a TCP header without clearing it, causing four uninitialized reserved bits to enter each generated reset. Exposure requires an affected kernel to generate an IPv6 TCP reset through the Netfilter reject path; each response discloses only those four bits.
Summary
What happened
Information disclosure in the Linux kernel allows remote attackers to read uninitialized kernel data from IPv6 TCP reset packets. The nf_reject_ip6_tcphdr_put function appends a TCP header without clearing it, causing four uninitialized reserved bits to enter each generated reset. Exposure requires an affected kernel to generate an IPv6 TCP reset through the Netfilter reject path; each response discloses only those four bits.
The record
- CVE
- CVE-2024-47685
- Published
- Oct 21, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
- Classifications
- CWE-908, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 21, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 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=0 <V3.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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