net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98491
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:00 UTC
Updated2026-10-24 14:16:44 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 37e3c878b183a115f9a114067f9ef3b408ad27fb git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 707c2dc77891a874f4e8c52c285a511079164ec8 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe de41ee24f77b0fc45397db3e277cae2adbd43dfe git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 55e5256adf3940e71802e2f749cacf81518726b0 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe e2829ae5459ddb5fce526b2e84697edf6c0c3cef git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55 git Not specified
CNA Linux Linux affected cae3a2627520c3795b54533c5328b77af3405dbe 26b2bd70d22457556e2fa01cbf1192cb1a94d619 git Not specified
CNA Linux Linux affected 4.3 Not specified
CNA Linux Linux unaffected 4.3 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/707c2dc77891a874f4e8c52c285a511079164ec8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/55e5256adf3940e71802e2f749cacf81518726b0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e2829ae5459ddb5fce526b2e84697edf6c0c3cef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/37e3c878b183a115f9a114067f9ef3b408ad27fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/26b2bd70d22457556e2fa01cbf1192cb1a94d619 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de41ee24f77b0fc45397db3e277cae2adbd43dfe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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