CVE-2026-72320
netfilter: nft_lookup: fix catchall element handling with inverted lookups
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().
INFO
Published Date :
Aug. 15, 2026, 6:22 a.m.
Last Modified :
Aug. 17, 2026, 6:18 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel.
- Apply the provided netfilter patch.
- Reboot the system if necessary.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-72320.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-72320 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-72320
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-72320 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-72320 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': '0ab8880865f9678eb6174e72c1fc4712e44c745c', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': '238c612357b5a25f03eacf356f95034f8551f218', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': 'ef0c7d4b04a0e6ad175323c24bc84e11470dd79d', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': 'e6107a4c74b54cb33e3bce162a63048ae5a6b198', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nft_lookup.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nft_lookup.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': '0ab8880865f9678eb6174e72c1fc4712e44c745c', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': '238c612357b5a25f03eacf356f95034f8551f218', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': 'ef0c7d4b04a0e6ad175323c24bc84e11470dd79d', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': 'e6107a4c74b54cb33e3bce162a63048ae5a6b198', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nft_lookup.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nft_lookup.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 15, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': '0ab8880865f9678eb6174e72c1fc4712e44c745c', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': '238c612357b5a25f03eacf356f95034f8551f218', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': 'ef0c7d4b04a0e6ad175323c24bc84e11470dd79d', 'versionType': 'git'}, {'status': 'affected', 'version': 'aaa31047a6d25da0fa101da1ed544e1247949b40', 'lessThan': 'e6107a4c74b54cb33e3bce162a63048ae5a6b198', 'versionType': 'git'}], 'programFiles': ['net/netfilter/nft_lookup.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc3', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/netfilter/nft_lookup.c'], 'defaultStatus': 'affected'}] Added 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(). Added Reference https://git.kernel.org/stable/c/0ab8880865f9678eb6174e72c1fc4712e44c745c Added Reference https://git.kernel.org/stable/c/238c612357b5a25f03eacf356f95034f8551f218 Added Reference https://git.kernel.org/stable/c/e6107a4c74b54cb33e3bce162a63048ae5a6b198 Added Reference https://git.kernel.org/stable/c/ef0c7d4b04a0e6ad175323c24bc84e11470dd79d