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CVE-2026-98251

HIGHCVSS 7.8/10EPSS 0.18%

Last modified

CVE-2026-98251 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.8/10

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

EPSS Probability
0.18%

7.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c2ac667358708d7cce64c78f58af6adf4c1e848b, < 4371d79ea74407fb992c985b1f94391e35bb8289; >= c2ac667358708d7cce64c78f58af6adf4c1e848b, < 7ff688aceada1160331a789385ea146f62fbddf7; >= c2ac667358708d7cce64c78f58af6adf4c1e848b, < 05eab8dced6bf4d3009a6eeee16ddac99047dc83; >= c2ac667358708d7cce64c78f58af6adf4c1e848b, < 579d87ec1e1e85729a6cb2c25961e58beb78640c; >= c2ac667358708d7cce64c78f58af6adf4c1e848b, < 2e6dd889c325abf23821e1459c3ffef59b7f0009; >= c2ac667358708d7cce64c78f58af6adf4c1e848b, < d16f089bd700f45d720ce989d5495e1dc3be0cf8; >= c2ac667358708d7cce64c78f58af6adf4c1e848b, < 8c9fcc6c33950d3db551af664d1fd3d998bfee56; >= c2ac667358708d7cce64c78f58af6adf4c1e848b, < 3f118c8217c109fd13ca61caa301d72c483897ef
LinuxLinux4.3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98251?
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.
How severe is CVE-2026-98251?
CVE-2026-98251 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98251?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST