Answer in brief
CVE-2026-89951 records a High severity (CVSS 8.8) vulnerability in batman-adv: fix stale receive device on merged fragments. 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 8.8. 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 | >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <63d86250fa7cbe22451369bd1c0881dfc8190958 || >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <f830c2dfc1431764db9256b3d5db1695fc9a7f56 || >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <f4b4ae763b5d59319fad62a00c76676758e7dafa || >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <6df64825f8b199921120c685af2abca14b077331 || >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <a2c272da99c2077088083c14961cf2f1e4506995 || >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <e91d2cc7441d89a45bad73ad9789159c7441cb80 || >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <2dffc8c44b6e3347b3719c6419c07b4a18fea895 || >=610bfc6bc99bc83680d190ebc69359a05fc7f605 <ad46c907d7d9975a285c1e89a4adde652eaa93f5 | 63d86250fa7cbe22451369bd1c0881dfc8190958, f830c2dfc1431764db9256b3d5db1695fc9a7f56, f4b4ae763b5d59319fad62a00c76676758e7dafa, 6df64825f8b199921120c685af2abca14b077331, a2c272da99c2077088083c14961cf2f1e4506995, e91d2cc7441d89a45bad73ad9789159c7441cb80, 2dffc8c44b6e3347b3719c6419c07b4a18fea895, ad46c907d7d9975a285c1e89a4adde652eaa93f5 |
| Linux/Linuxgeneric | 3.13 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 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: fix stale receive device on merged fragments Fragment reassembly reuses the skb from the highest-numbered buffered fragment as the merged packet. When that fragment was received on a hard interface which is deleted before the chain completes, the merged skb can re-enter the receive path with a stale skb->dev and skb_iif. batadv_batman_skb_recv() passes such merged packets through the normal receive handlers again. DAT and bridge loop avoidance both derive the ARP header length from skb->dev, so they can dereference the freed net_device before the packet reaches the local mesh interface. Refresh the receive device metadata from the current receive device before running the packet handlers. This keeps internally reinjected merged fragments consistent with the normal receive path after hard interface teardown.
Quoted source text, attributed separately from HOL analysis.