Overview
About vulnerability
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().
Details
- Affected product:
- Debian 10 ELS
- Affected packages:
- linux @ 4.19.0