CVE-2026-89951
Description
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.
How to fix
- Linux Linux63d86250fa7cbe22451369bd1c0881dfc8190958, f830c2dfc1431764db9256b3d5db1695fc9a7f56, f4b4ae763b5d59319fad62a00c76676758e7dafa, 6df64825f8b199921120c685af2abca14b077331, a2c272da99c2077088083c14961cf2f1e4506995, e91d2cc7441d89a45bad73ad9789159c7441cb80, 2dffc8c44b6e3347b3719c6419c07b4a18fea895, ad46c907d7d9975a285c1e89a4adde652eaa93f5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < 63d86250fa7cbe22451369bd1c0881dfc8190958, 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < f830c2dfc1431764db9256b3d5db1695fc9a7f56, 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < f4b4ae763b5d59319fad62a00c76676758e7dafa, 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < 6df64825f8b199921120c685af2abca14b077331, 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < a2c272da99c2077088083c14961cf2f1e4506995, 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < e91d2cc7441d89a45bad73ad9789159c7441cb80, 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < 2dffc8c44b6e3347b3719c6419c07b4a18fea895, 610bfc6bc99bc83680d190ebc69359a05fc7f605 ≤ v < ad46c907d7d9975a285c1e89a4adde652eaa93f5, 3.13 | 63d86250fa7cbe22451369bd1c0881dfc8190958, f830c2dfc1431764db9256b3d5db1695fc9a7f56, f4b4ae763b5d59319fad62a00c76676758e7dafa, 6df64825f8b199921120c685af2abca14b077331, a2c272da99c2077088083c14961cf2f1e4506995, e91d2cc7441d89a45bad73ad9789159c7441cb80, 2dffc8c44b6e3347b3719c6419c07b4a18fea895, ad46c907d7d9975a285c1e89a4adde652eaa93f5 |
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