Answer in brief
CVE-2026-98491 records a High severity (CVSS 7.8) vulnerability in net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 4.3 | Not reported |
| Linux/Linuxgeneric | >=cae3a2627520c3795b54533c5328b77af3405dbe <e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d || >=cae3a2627520c3795b54533c5328b77af3405dbe <37e3c878b183a115f9a114067f9ef3b408ad27fb || >=cae3a2627520c3795b54533c5328b77af3405dbe <707c2dc77891a874f4e8c52c285a511079164ec8 || >=cae3a2627520c3795b54533c5328b77af3405dbe <de41ee24f77b0fc45397db3e277cae2adbd43dfe || >=cae3a2627520c3795b54533c5328b77af3405dbe <55e5256adf3940e71802e2f749cacf81518726b0 || >=cae3a2627520c3795b54533c5328b77af3405dbe <e2829ae5459ddb5fce526b2e84697edf6c0c3cef || >=cae3a2627520c3795b54533c5328b77af3405dbe <457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55 || >=cae3a2627520c3795b54533c5328b77af3405dbe <26b2bd70d22457556e2fa01cbf1192cb1a94d619 | e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d, 37e3c878b183a115f9a114067f9ef3b408ad27fb, 707c2dc77891a874f4e8c52c285a511079164ec8, de41ee24f77b0fc45397db3e277cae2adbd43dfe, 55e5256adf3940e71802e2f749cacf81518726b0, e2829ae5459ddb5fce526b2e84697edf6c0c3cef, 457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55, 26b2bd70d22457556e2fa01cbf1192cb1a94d619 |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
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.
Quoted source text, attributed separately from HOL analysis.