High 7.8Published Oct 18, 2026

CVE-2026-98491net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

Updated under an hour ago (Oct 26, 2026, 9:23 PM ET)

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EPSS puts the chance of exploitation in the next 30 days at 0.21%, higher than 11% of scored CVEs.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry In a case where skb with an unconfirmed ct entry gets cloned, we may end up committing both but with different sets of extensions. The series of events: 1. The first clone wants to commit and runs the helpers wiring up the extension pointer into the expectation list. 2. Then it looses the confirmation keeping the entry unconfirmed. 3. Second clone now wants to commit labels and adds the new extension for that breaking the pointer in the expectation list causing UAF on the destruction path later. While this is possible to trigger, there should be no practical network pipeline where committing both clones without modifications into the same zone is needed. So, let's just reset the entry in case for some reason we got an skb with a shared one during commit. This doesn't affect any known use cases, but avoids any potential problems with sharing and modification of the unconfirmed ct entry. The fixes tag points to the introduction of helpers, since that's the main UAF trigger for the sharing.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.21% (percentile 11)
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 24, 2026
First seen by InfoSec Signals: Oct 18, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from cae3a2627520c3795b54533c5328b77af3405dbe before e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d; from cae3a2627520c3795b54533c5328b77af3405dbe before 37e3c878b183a115f9a114067f9ef3b408ad27fb; from cae3a2627520c3795b54533c5328b77af3405dbe before 707c2dc77891a874f4e8c52c285a511079164ec8; from cae3a2627520c3795b54533c5328b77af3405dbe before de41ee24f77b0fc45397db3e277cae2adbd43dfe; from cae3a2627520c3795b54533c5328b77af3405dbe before 55e5256adf3940e71802e2f749cacf81518726b0; from cae3a2627520c3795b54533c5328b77af3405dbe before e2829ae5459ddb5fce526b2e84697edf6c0c3cef; from cae3a2627520c3795b54533c5328b77af3405dbe before 457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55; from cae3a2627520c3795b54533c5328b77af3405dbe before 26b2bd70d22457556e2fa01cbf1192cb1a94d619	CNA record

References

References

https://git.kernel.org/stable/c/e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d
https://git.kernel.org/stable/c/37e3c878b183a115f9a114067f9ef3b408ad27fb
https://git.kernel.org/stable/c/707c2dc77891a874f4e8c52c285a511079164ec8
https://git.kernel.org/stable/c/de41ee24f77b0fc45397db3e277cae2adbd43dfe
https://git.kernel.org/stable/c/55e5256adf3940e71802e2f749cacf81518726b0
https://git.kernel.org/stable/c/e2829ae5459ddb5fce526b2e84697edf6c0c3cef
https://git.kernel.org/stable/c/457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55
https://git.kernel.org/stable/c/26b2bd70d22457556e2fa01cbf1192cb1a94d619

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.