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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98873: netfilter: nf_conntrack_expect: zero at allocation time

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 241ccd2fed9051db443aadce248fc0ab30f55e97, 39cb6ff947c16a576ea68c5f272e634acdcb0085, 824397af7bfe14edad374c64253dae0187ca623d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 241ccd2fed9051db443aadce248fc0ab30f55e97, 39cb6ff947c16a576ea68c5f272e634acdcb0085, 824397af7bfe14edad374c64253dae0187ca623d; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Oct 23, 2026
Updated
Oct 26, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.4affected
    • 076a0ca02644657b13e4af363f487ced2942e9cb and later · before 39cb6ff947c16a576ea68c5f272e634acdcb0085affected · git
    • 076a0ca02644657b13e4af363f487ced2942e9cb and later · before 90545aa07a183887e9d72ce573c18e08f62e2c91affected · git
    • 076a0ca02644657b13e4af363f487ced2942e9cb and later · before 9c11d7ea5ff4dbe162e79f00188814ef5483c295affected · git
    • 076a0ca02644657b13e4af363f487ced2942e9cb and later · before b7f3ee925aee9f1f547d539bc03c35433c238958affected · git
    • 076a0ca02644657b13e4af363f487ced2942e9cb and later · before 824397af7bfe14edad374c64253dae0187ca623daffected · git
    • 076a0ca02644657b13e4af363f487ced2942e9cb and later · before a39ecb856514274c80d0fac4d128dba6b266a8edaffected · git
    • 076a0ca02644657b13e4af363f487ced2942e9cb and later · before 241ccd2fed9051db443aadce248fc0ab30f55e97affected · git
    • before 3.4not affected · semver
    • 5.10.271 and later · up to and including 5.10.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98871Oct 23, 2026 · crypto: ccp - Fix possible deadlock in SEV init failure path
    0Monitor
  • ← EarlierCVE-2026-98872Oct 23, 2026 · freevxfs: don't BUG() on unknown typed-extent type
    0Monitor
  • Later →CVE-2026-98874Oct 23, 2026 · wifi: iwlwifi: mld: don't WARN on WoWLAN suspend w/o netdetect
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux241ccd2fed9051db443aadce248fc0ab30f55e97Vendor (CNA)
Linux Linux39cb6ff947c16a576ea68c5f272e634acdcb0085Vendor (CNA)
Linux Linux824397af7bfe14edad374c64253dae0187ca623dVendor (CNA)
Linux Linux90545aa07a183887e9d72ce573c18e08f62e2c91Vendor (CNA)
Linux Linux9c11d7ea5ff4dbe162e79f00188814ef5483c295Vendor (CNA)
Linux Linuxa39ecb856514274c80d0fac4d128dba6b266a8edVendor (CNA)
Linux Linuxb7f3ee925aee9f1f547d539bc03c35433c238958Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 6, 2026+14 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records