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CVE-2026-98251

openvswitch: avoid reallocating confirmed conntrack labels

No known exploitation. EPSS puts it in the 3rd percentile. Fixed versions are out.

CVSS 3.17.8HighEPSS percentile3rd0.1% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix1 product4 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

Find your product and version, then upgrade to the build on the right.

  • LinuxAffected: ≥ c2ac667358708d7cce64c78f58af6adf4c1e848b, < 4371d79ea74407fb992c985b1f94391e35bb8289Upgrade to: 4371d79ea74407fb992c985b1f94391e35bb8289Affected: ≥ c2ac667358708d7cce64c78f58af6adf4c1e848b, < 7ff688aceada1160331a789385ea146f62fbddf7Upgrade to: 7ff688aceada1160331a789385ea146f62fbddf7Affected: ≥ c2ac667358708d7cce64c78f58af6adf4c1e848b, < 05eab8dced6bf4d3009a6eeee16ddac99047dc83Upgrade to: 05eab8dced6bf4d3009a6eeee16ddac99047dc83Affected: ≥ c2ac667358708d7cce64c78f58af6adf4c1e848b, < 579d87ec1e1e85729a6cb2c25961e58beb78640cUpgrade to: 579d87ec1e1e85729a6cb2c25961e58beb78640c + 4 more branchesStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

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What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS3rd
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.1% chance of exploitation activity in the next 30 days, which ranks it in the 3rd percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

3 events over 1 day, from the signal feeds we watch.

  1. Record updated
  2. Publishedrecord updated

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 7.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Sources

References in the record

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In the news

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