Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_lookup: fix catchall element handling with inverted lookups
nft_lookup_eval() decides whether a lookup matched (`found`) from the direct set lookup and priv->invert before falling back to the catchall element used by interval sets (e.g. nft_set_rbtree) for the open-ended default range. Since `found` is never recomputed after `ext` is replaced by the catchall lookup, inverted lookups (NFT_LOOKUP_F_INV, "!= @set") can wrongly match or wrongly skip the catchall element, producing the wrong verdict. Fold the catchall lookup into `ext` before computing `found`, matching the order already used by nft_objref_map_eval().
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= aaa31047a6d25da0fa101da1ed544e1247949b40, < 87ff022a58788ff4a25cf2c609b9abae418c9323; >= aaa31047a6d25da0fa101da1ed544e1247949b40, < 65d35cb555f40529a9edc6bf4beaa3bee917f015; >= aaa31047a6d25da0fa101da1ed544e1247949b40, < 0ab8880865f9678eb6174e72c1fc4712e44c745c; >= aaa31047a6d25da0fa101da1ed544e1247949b40, < 238c612357b5a25f03eacf356f95034f8551f218; >= aaa31047a6d25da0fa101da1ed544e1247949b40, < ef0c7d4b04a0e6ad175323c24bc84e11470dd79d; >= aaa31047a6d25da0fa101da1ed544e1247949b40, < e6107a4c74b54cb33e3bce162a63048ae5a6b198 |
| Linux | Linux | 5.13 |
References
- https://git.kernel.org/stable/c/0ab8880865f9678eb6174e72c1fc4712e44c745c
- https://git.kernel.org/stable/c/238c612357b5a25f03eacf356f95034f8551f218
- https://git.kernel.org/stable/c/65d35cb555f40529a9edc6bf4beaa3bee917f015
- https://git.kernel.org/stable/c/87ff022a58788ff4a25cf2c609b9abae418c9323
- https://git.kernel.org/stable/c/e6107a4c74b54cb33e3bce162a63048ae5a6b198
- https://git.kernel.org/stable/c/ef0c7d4b04a0e6ad175323c24bc84e11470dd79d
Timeline
- Published
- Aug 15, 2026
- Last modified
- Oct 30, 2026
- NVD status
- Received