Answer in brief
CVE-2026-80846 records a Unknown severity vulnerability in xfrm: drop ESP-in-TCP packets with no ingress device. 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.
A CVSS score is not reported in the current record. 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 | >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <239d0f71af09dc2029fd4d730cb24b8c83aaa43a || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <f00235f9d12301183d61f75fbe4105506f3e5140 || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <6af5cdb03819a5ce6e945992635c6c5e91045367 || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <2dd1609cadff46c4b20ce53b91ab9cce1380456a || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <c296d25efbc840be24de83f56d43bc47e714ace9 || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <328e40aa774b446969c69b654c52a051a95af8a1 || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <7911e0236616487b89db6bd3ba3f408abd10eb23 || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <943d95233b8b4a88994e244fcf466f8c403d63f1 || >=e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 <e1d7c5ac1c246ce5775f604515de0a59fbf2116e | 239d0f71af09dc2029fd4d730cb24b8c83aaa43a, f00235f9d12301183d61f75fbe4105506f3e5140, 6af5cdb03819a5ce6e945992635c6c5e91045367, 2dd1609cadff46c4b20ce53b91ab9cce1380456a, c296d25efbc840be24de83f56d43bc47e714ace9, 328e40aa774b446969c69b654c52a051a95af8a1, 7911e0236616487b89db6bd3ba3f408abd10eb23, 943d95233b8b4a88994e244fcf466f8c403d63f1, e1d7c5ac1c246ce5775f604515de0a59fbf2116e |
| Linux/Linuxgeneric | 5.6 | Not reported |
Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 4, 2026
In the Linux kernel, the following vulnerability has been resolved: xfrm: drop ESP-in-TCP packets with no ingress device ESP-in-TCP receives records through the TCP strparser. handle_esp() restores skb->dev from the saved skb_iif before passing the packet into the XFRM input path. Queued TCP data can be processed after the original ingress device has been removed, for example during veth or net namespace teardown. In that case dev_get_by_index_rcu() returns NULL. The XFRM IPv4 and IPv6 input paths both expect skb->dev to be valid while building the route lookup, so queued ESP-in-TCP data can dereference a NULL device. Drop the packet if the saved ingress device can no longer be resolved. Such a packet can no longer be routed through the normal XFRM receive path, and this preserves the existing behaviour for packets whose ingress device still exists.
Quoted source text, attributed separately from HOL analysis.