Answer in brief
CVE-2026-98441 records a High severity (CVSS 7.8) vulnerability in net/sched: act_ct: 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), 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), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a21b06e7319129994f339ed47f512bbe57b77f5b <2b783c562c3238ff50c34fd7a72a735c9cc73d9a || >=a21b06e7319129994f339ed47f512bbe57b77f5b <4a04ed91575819fb1859311113e95700b709bec7 || >=a21b06e7319129994f339ed47f512bbe57b77f5b <b097d9d7a5b09c8ec5c4c1a08e35ac5a66b06b44 || >=a21b06e7319129994f339ed47f512bbe57b77f5b <f85009dfcd65e5969526b0db7a49b5413746e630 | 2b783c562c3238ff50c34fd7a72a735c9cc73d9a, 4a04ed91575819fb1859311113e95700b709bec7, b097d9d7a5b09c8ec5c4c1a08e35ac5a66b06b44, f85009dfcd65e5969526b0db7a49b5413746e630 |
| Linux/Linuxgeneric | 6.2 | Not reported |
| Linux/Linuxgeneric | >=a21b06e7319129994f339ed47f512bbe57b77f5b <c812bb4aea13d385d048b5b24756aee2edf6f99e || >=a21b06e7319129994f339ed47f512bbe57b77f5b <2b783c562c3238ff50c34fd7a72a735c9cc73d9a || >=a21b06e7319129994f339ed47f512bbe57b77f5b <4a04ed91575819fb1859311113e95700b709bec7 || >=a21b06e7319129994f339ed47f512bbe57b77f5b <b097d9d7a5b09c8ec5c4c1a08e35ac5a66b06b44 || >=a21b06e7319129994f339ed47f512bbe57b77f5b <f85009dfcd65e5969526b0db7a49b5413746e630 | c812bb4aea13d385d048b5b24756aee2edf6f99e, 2b783c562c3238ff50c34fd7a72a735c9cc73d9a, 4a04ed91575819fb1859311113e95700b709bec7, b097d9d7a5b09c8ec5c4c1a08e35ac5a66b06b44, f85009dfcd65e5969526b0db7a49b5413746e630 |
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/sched: act_ct: avoid modifying shared unconfirmed ct entry In a case where skb with an unconfirmed ct entry gets cloned, we may end up processing both again 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 or run NAT 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 we need to process both clones without modifications in the same zone. So, let's just reset the entry in case for some reason we got an skb with a shared one. This doesn't affect any known use cases, but avoids any potential problems with sharing and modification of the unconfirmed ct entry. Unlike openvswitch module, act_ct allows for NAT without commit. Changing that would be a uAPI break. So, act_ct needs to reset on NAT regardless of the commit flag to avoid reallocation of the extension space. This, however, doesn't really change the picture for sensible networking cases as there should be no need to run the same packet twice (before and after the clone) through conntrack without packet header or zone changes and without commit. 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.