CVE-2026-72320netfilter: nft_lookup: fix catchall element handling with inverted lookups
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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().
- CVSS
- 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from aaa31047a6d25da0fa101da1ed544e1247949b40 before 0ab8880865f9678eb6174e72c1fc4712e44c745c; from aaa31047a6d25da0fa101da1ed544e1247949b40 before 238c612357b5a25f03eacf356f95034f8551f218; from aaa31047a6d25da0fa101da1ed544e1247949b40 before ef0c7d4b04a0e6ad175323c24bc84e11470dd79d; from aaa31047a6d25da0fa101da1ed544e1247949b40 before e6107a4c74b54cb33e3bce162a63048ae5a6b198 | CNA record |
References
- https://git.kernel.org/stable/c/0ab8880865f9678eb6174e72c1fc4712e44c745c
- https://git.kernel.org/stable/c/238c612357b5a25f03eacf356f95034f8551f218
- https://git.kernel.org/stable/c/ef0c7d4b04a0e6ad175323c24bc84e11470dd79d
- https://git.kernel.org/stable/c/e6107a4c74b54cb33e3bce162a63048ae5a6b198
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.