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

CVE-2026-98251: openvswitch: avoid reallocating confirmed conntrack labels

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 05eab8dced6bf4d3009a6eeee16ddac99047dc83, 2e6dd889c325abf23821e1459c3ffef59b7f0009, 3f118c8217c109fd13ca61caa301d72c483897ef; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 05eab8dced6bf4d3009a6eeee16ddac99047dc83, 2e6dd889c325abf23821e1459c3ffef59b7f0009, 3f118c8217c109fd13ca61caa301d72c483897ef; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: openvswitch: avoid reallocating confirmed conntrack labels ovs_ct_get_conn_labels() adds the labels extension when a conntrack entry does not have one. Confirmed conntracks can be read locklessly, so adding an extension may reallocate and free the extension block while another CPU accesses it. Only add the extension for unconfirmed conntracks. A confirmed conntrack without labels now fails the caller's label operation instead of reallocating its extension storage.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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Follow CVE-2026-98251

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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

    • 4.3affected
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before 4371d79ea74407fb992c985b1f94391e35bb8289affected · git
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before 7ff688aceada1160331a789385ea146f62fbddf7affected · git
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before 05eab8dced6bf4d3009a6eeee16ddac99047dc83affected · git
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before 579d87ec1e1e85729a6cb2c25961e58beb78640caffected · git
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before 2e6dd889c325abf23821e1459c3ffef59b7f0009affected · git
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before d16f089bd700f45d720ce989d5495e1dc3be0cf8affected · git
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before 8c9fcc6c33950d3db551af664d1fd3d998bfee56affected · git
    • c2ac667358708d7cce64c78f58af6adf4c1e848b and later · before 3f118c8217c109fd13ca61caa301d72c483897efaffected · git
    • before 4.3not 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:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

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-2026-98249Oct 6, 2026 · arm64: hibernate: pass HVC_SET_VECTORS args to the resume hvc
    0Monitor
  • ← EarlierCVE-2026-98250Oct 6, 2026 · nfsd: fix handling of NFSEXP_PNFS in the netlink codepath
    0Monitor
  • Later →CVE-2026-98252Oct 6, 2026 · RDMA/core: fix refcount bug in iwpm_get_nlmsg_request()
    28Monitor

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 Linux05eab8dced6bf4d3009a6eeee16ddac99047dc83Vendor (CNA)
Linux Linux2e6dd889c325abf23821e1459c3ffef59b7f0009Vendor (CNA)
Linux Linux3f118c8217c109fd13ca61caa301d72c483897efVendor (CNA)
Linux Linux4371d79ea74407fb992c985b1f94391e35bb8289Vendor (CNA)
Linux Linux579d87ec1e1e85729a6cb2c25961e58beb78640cVendor (CNA)
Linux Linux7ff688aceada1160331a789385ea146f62fbddf7Vendor (CNA)
Linux Linux8c9fcc6c33950d3db551af664d1fd3d998bfee56Vendor (CNA)
Linux Linuxd16f089bd700f45d720ce989d5495e1dc3be0cf8Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · 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 10, 2026+35 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.

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Bug bounty scope

No known public program.

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

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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. CVSS— → 7.8
  2. Severity— → high
  3. Exploit maturity— → none
  4. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records