CVE-2026-98251

openvswitch: avoid reallocating confirmed conntrack labels

State: Published
Severity: 7.8 High
Published: Oct 6, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c2ac667358708d7cce64c78f58af6adf4c1e848b to before 4371d79ea74407fb992c985b1f94391e35bb8289Affected c2ac667358708d7cce64c78f58af6adf4c1e848b to before 7ff688aceada1160331a789385ea146f62fbddf7Affected c2ac667358708d7cce64c78f58af6adf4c1e848b to before 05eab8dced6bf4d3009a6eeee16ddac99047dc83Affected c2ac667358708d7cce64c78f58af6adf4c1e848b to before 579d87ec1e1e85729a6cb2c25961e58beb78640cAffected c2ac667358708d7cce64c78f58af6adf4c1e848b to before 2e6dd889c325abf23821e1459c3ffef59b7f0009Affected c2ac667358708d7cce64c78f58af6adf4c1e848b to before d16f089bd700f45d720ce989d5495e1dc3be0cf8Affected c2ac667358708d7cce64c78f58af6adf4c1e848b to before 8c9fcc6c33950d3db551af664d1fd3d998bfee56Affected c2ac667358708d7cce64c78f58af6adf4c1e848b to before 3f118c8217c109fd13ca61caa301d72c483897efAffected
LinuxLinux	4.3Affected before 4.3Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.54 through 6.18.Not affected 7.2.8 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

c2ac667358708d7cce64c78f58af6adf4c1e848b to before 4371d79ea74407fb992c985b1f94391e35bb8289Affected
c2ac667358708d7cce64c78f58af6adf4c1e848b to before 7ff688aceada1160331a789385ea146f62fbddf7Affected
c2ac667358708d7cce64c78f58af6adf4c1e848b to before 05eab8dced6bf4d3009a6eeee16ddac99047dc83Affected
c2ac667358708d7cce64c78f58af6adf4c1e848b to before 579d87ec1e1e85729a6cb2c25961e58beb78640cAffected
c2ac667358708d7cce64c78f58af6adf4c1e848b to before 2e6dd889c325abf23821e1459c3ffef59b7f0009Affected
c2ac667358708d7cce64c78f58af6adf4c1e848b to before d16f089bd700f45d720ce989d5495e1dc3be0cf8Affected
c2ac667358708d7cce64c78f58af6adf4c1e848b to before 8c9fcc6c33950d3db551af664d1fd3d998bfee56Affected
c2ac667358708d7cce64c78f58af6adf4c1e848b to before 3f118c8217c109fd13ca61caa301d72c483897efAffected

LinuxLinux

4.3Affected
before 4.3Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.54 through 6.18.*Not affected
7.2.8 through 7.2.*Not affected
7.3 and laterNot affected

References

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