CVE-2026-98251
Linux: openvswitch: avoid reallocating confirmed conntrack labels
Linux LinuxOperating systemsCVSS
7.8HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.14%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in4371d79ea74407fb992c985b1f94391e35bb8289Also 7ff688aceada1160331a789385ea146f62fbddf7, 05eab8dced6bf4d3009a6eeee16ddac99047dc83 and 4 moreCVE List
What fixes it
- 4371d79ea74407fb992c985b1f94391e35bb8289LinuxCVE List
- 7ff688aceada1160331a789385ea146f62fbddf7LinuxCVE List
- 05eab8dced6bf4d3009a6eeee16ddac99047dc83LinuxCVE List
- 579d87ec1e1e85729a6cb2c25961e58beb78640cLinuxCVE List
- 2e6dd889c325abf23821e1459c3ffef59b7f0009LinuxCVE List
- 8c9fcc6c33950d3db551af664d1fd3d998bfee56LinuxCVE List
Show all 7 fixed versions
- 3f118c8217c109fd13ca61caa301d72c483897efLinuxCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 18
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before 4371d79ea74407fb992c985b1f94391e35bb8289CVE List
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before 7ff688aceada1160331a789385ea146f62fbddf7CVE List
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before 05eab8dced6bf4d3009a6eeee16ddac99047dc83CVE List
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before 579d87ec1e1e85729a6cb2c25961e58beb78640cCVE List
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before 2e6dd889c325abf23821e1459c3ffef59b7f0009CVE List
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before d16f089bd700f45d720ce989d5495e1dc3be0cf8CVE List
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before 8c9fcc6c33950d3db551af664d1fd3d998bfee56CVE List
- Linuxaffected: c2ac667358708d7cce64c78f58af6adf4c1e848b before 3f118c8217c109fd13ca61caa301d72c483897efCVE List
- Linuxaffected: 4.3CVE List
- Linuxunaffected: all versions before 4.3CVE List
- Linuxunaffected: 5.10.271 through 5.10.*CVE List
- Linuxunaffected: 5.15.222 through 5.15.*CVE List
- Linuxunaffected: 6.1.189 through 6.1.*CVE List
- Linuxunaffected: 6.6.158 through 6.6.*CVE List
- Linuxunaffected: 6.12.112 through 6.12.*CVE List
- Linuxunaffected: 6.18.54 through 6.18.*CVE List
- Linuxunaffected: 7.2.8 through 7.2.*CVE List
- Linuxunaffected: 7.3CVE List
References 8
- git.kernel.org/stable/c/4371d79ea74407fb992c985b1f94391e35bb8289Referencevia CVE List
- git.kernel.org/stable/c/7ff688aceada1160331a789385ea146f62fbddf7Referencevia CVE List
- git.kernel.org/stable/c/05eab8dced6bf4d3009a6eeee16ddac99047dc83Referencevia CVE List
- git.kernel.org/stable/c/579d87ec1e1e85729a6cb2c25961e58beb78640cReferencevia CVE List
- git.kernel.org/stable/c/2e6dd889c325abf23821e1459c3ffef59b7f0009Referencevia CVE List
- git.kernel.org/stable/c/d16f089bd700f45d720ce989d5495e1dc3be0cf8Referencevia CVE List
- git.kernel.org/stable/c/8c9fcc6c33950d3db551af664d1fd3d998bfee56Referencevia CVE List
- git.kernel.org/stable/c/3f118c8217c109fd13ca61caa301d72c483897efReferencevia CVE List