Answer in brief
CVE-2026-80838 records a Unknown severity vulnerability in vxlan: keep the last remote linked during FDB flush. 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 | >=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <2a7c2f00843225d5f037676bca649321f3d024c7 || >=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <a8820c8a7718327e96849782033e7c85a0f6bcfe || >=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c || >=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab || >=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <d5d4a7b538b52db63927773a8905fcd9f78a42e2 | 2a7c2f00843225d5f037676bca649321f3d024c7, a8820c8a7718327e96849782033e7c85a0f6bcfe, 8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c, 4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab, d5d4a7b538b52db63927773a8905fcd9f78a42e2 |
| Linux/Linuxgeneric | 6.7 | 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: vxlan: keep the last remote linked during FDB flush A non-nexthop FDB entry is expected to have at least one remote while it remains reachable through the FDB hash table. A filtered bulk flush violates this invariant when every remote matches: It unlinks the last remote in vxlan_fdb_dst_destroy() and only afterwards tells vxlan_flush() to destroy the parent FDB entry. An RCU reader can find the parent during this interval. first_remote_rcu() then applies list_entry_rcu() to the empty list head, producing an invalid remote pointer that the receive learning path can read from and write to. When a matching remote is the sole remaining remote, leave it linked and ask the caller to destroy the entire FDB entry. vxlan_fdb_destroy() keeps the remote attached while sending the deletion notification and removing the parent from the lookup structures.
Quoted source text, attributed separately from HOL analysis.