Answer in brief
CVE-2026-89950 records a Unknown severity vulnerability in batman-adv: mcast: linearize skbuff for packet generation. 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 | >=90039133221e33964ccb4a536dad7eb0a372fff7 <a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e || >=90039133221e33964ccb4a536dad7eb0a372fff7 <c32e5e25c41201c8c3b796a4ab2c45103187091e || >=90039133221e33964ccb4a536dad7eb0a372fff7 <2879177539e3ece483a8e5406970373698e9a6c5 || >=90039133221e33964ccb4a536dad7eb0a372fff7 <6a30a59e2660afd03c975f1b8eae6a2301161197 | a9603e0a7cb5e0cddc6b23af153cf7daafc5c55e, c32e5e25c41201c8c3b796a4ab2c45103187091e, 2879177539e3ece483a8e5406970373698e9a6c5, 6a30a59e2660afd03c975f1b8eae6a2301161197 |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: linearize skbuff for packet generation batadv_mcast_forw_packet() and batadv_mcast_forw_scrape() is not only called (indirectly) by the unsharing+linearizing batadv_recv_mcast_packet() handler. When it is called (indirectly) by batadv_mcast_forw_mcsend() then it will be unshared but not linearized. The SKB_LINEAR_ASSERT() can therefore cause a fatal BUG(). The linearization should happen during the expansion of the head because the scrape function can be hit already during the initial batadv_mcast_forw_mode() selection code: * batadv_interface_tx * batadv_mcast_forw_mode * batadv_mcast_forw_mode_by_count() * batadv_mcast_forw_push() -> calls batadv_mcast_forw_expand_head() before everything else * batadv_mcast_forw_push_tvlvs() * batadv_mcast_forw_push_dests() * batadv_mcast_forw_push_adjust_padding() * batadv_mcast_forw_scrape()
Quoted source text, attributed separately from HOL analysis.