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CVE-2026-98873

netfilter: nf_conntrack_expect: zero at allocation time

CVSS score

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EPSS probability

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Risk score

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Published

3 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

DayBreach AI Explanation

Verified against sources

Linux Kernel netfilter Vulnerability

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

CVE-2026-98873 in the Linux kernel netfilter component addresses potential uninitialized data leakage to userspace via ctnetlink by zeroing memory at allocation time.

Why does it matter?

This vulnerability involves potential data leakage risks where sensitive memory contents might be exposed to userspace.

What should be done?

  • Follow vendor advisories
  • Keep affected kernel versions updated
Chain of evidence and sources2 verified claims

CVE-2026-98873, Linux çekirdeğinin netfilter bileşenini etkilemektedir.

S0 · daybreach-canonicalS1 · cvelist

Sorun, ctnetlink üzerinden kullanıcı alanına başlatılmamış veri sızması ihtimalinden kaynaklanmaktadır.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: zero at allocation time There are occasional LLM hints wrt. leaking uninitialized data to userspace via ctnetlink. Just zero at allocation time, expectations are not frequently used these days. Intentionally keeps _init as-is because we could theoretically support re-init, so add the missing exp->dir there.

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-98873 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1linuxLinux View
2linuxLinux View
Total affected vendors: 1|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
The sources have not yet published a verified CVSS metric.

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98873 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98873 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Official Sources and Advisories

https://git.kernel.org/stable/c/39cb6ff947c16a576ea68c5f272e634acdcb0085vendor-advisoryhttps://git.kernel.org/stable/c/90545aa07a183887e9d72ce573c18e08f62e2c91vendor-advisoryhttps://git.kernel.org/stable/c/9c11d7ea5ff4dbe162e79f00188814ef5483c295vendor-advisoryhttps://git.kernel.org/stable/c/b7f3ee925aee9f1f547d539bc03c35433c238958vendor-advisoryhttps://git.kernel.org/stable/c/824397af7bfe14edad374c64253dae0187ca623dvendor-advisoryhttps://git.kernel.org/stable/c/a39ecb856514274c80d0fac4d128dba6b266a8edvendor-advisoryhttps://git.kernel.org/stable/c/241ccd2fed9051db443aadce248fc0ab30f55e97vendor-advisory

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

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CVE-2026-98873 · netfilter: nf_conntrack_expect: zero at…