CVE-2026-72320: netfilter: nft_lookup: fix catchall element handling with inverted lookups
Noroxi assessment
Priority: Monitor (action score 36/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.56% (FIRST EPSS).
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: Linux Linux 0ab8880865f9678eb6174e72c1fc4712e44c745c, 238c612357b5a25f03eacf356f95034f8551f218, 65d35cb555f40529a9edc6bf4beaa3bee917f015; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.
Low priority for now. Upgrade to Linux Linux 0ab8880865f9678eb6174e72c1fc4712e44c745c, 238c612357b5a25f03eacf356f95034f8551f218, 65d35cb555f40529a9edc6bf4beaa3bee917f015; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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().
- Published
- Aug 15, 2026
- Updated
- Oct 30, 2026
- EPSS
- 0.5% · 47th percentile
- CWE
- —
Report tools
Action score
36
Low priority for now.
- CVSS
- 36 / 40 · 9.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 9.1
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 5.13affected
- aaa31047a6d25da0fa101da1ed544e1247949b40 and later · before 87ff022a58788ff4a25cf2c609b9abae418c9323affected · git
- aaa31047a6d25da0fa101da1ed544e1247949b40 and later · before 65d35cb555f40529a9edc6bf4beaa3bee917f015affected · git
- aaa31047a6d25da0fa101da1ed544e1247949b40 and later · before 0ab8880865f9678eb6174e72c1fc4712e44c745caffected · git
- aaa31047a6d25da0fa101da1ed544e1247949b40 and later · before 238c612357b5a25f03eacf356f95034f8551f218affected · git
- aaa31047a6d25da0fa101da1ed544e1247949b40 and later · before ef0c7d4b04a0e6ad175323c24bc84e11470dd79daffected · git
- aaa31047a6d25da0fa101da1ed544e1247949b40 and later · before e6107a4c74b54cb33e3bce162a63048ae5a6b198affected · git
- before 5.13not affected · semver
- 6.1.191 and later · up to and including 6.1.*not affected · semver
- 6.6.160 and later · up to and including 6.6.*not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:9 | kernel | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-core | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-core | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-devel | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-devel-matched | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules-core | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-debug-modules-extra | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-devel | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-devel-matched | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules-core | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-64k-modules-extra | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-abi-stablelists | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-core | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-cross-headers | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-debug | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-debug-core | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-debug-devel | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-debug-devel-matched | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-debug-modules | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
| AlmaLinux:9 | kernel-debug-modules-core | before 5.14.0-687.58.1.el9_8 | 5.14.0-687.58.1.el9_8 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-72318Aug 15, 2026 · cifs: validate DFS referral string offsets37Monitor
- ← EarlierCVE-2026-72319Aug 15, 2026 · ipvs: ensure inner headers in ICMP errors are in headroom39Monitor
- Later →CVE-2026-72321Aug 15, 2026 · ipv4: igmp: Fix potential memory leaks in igmp_mod_timer() and igmp_stop_timer()0Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 0ab8880865f9678eb6174e72c1fc4712e44c745c | Vendor (CNA) |
| Linux Linux | 238c612357b5a25f03eacf356f95034f8551f218 | Vendor (CNA) |
| Linux Linux | 65d35cb555f40529a9edc6bf4beaa3bee917f015 | Vendor (CNA) |
| Linux Linux | 87ff022a58788ff4a25cf2c609b9abae418c9323 | Vendor (CNA) |
| Linux Linux | e6107a4c74b54cb33e3bce162a63048ae5a6b198 | Vendor (CNA) |
| Linux Linux | ef0c7d4b04a0e6ad175323c24bc84e11470dd79d | Vendor (CNA) |
| azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 | Release Notes | Microsoft (MSRC) |
| azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 | Release Notes | Microsoft (MSRC) |
| azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 | 6.6.161.1-1 · Release Notes | Microsoft (MSRC) |
| almalinux:kernel | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-core | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 5.14.0-687.58.1.el9_8 · AlmaLinux:9 | Package registry (OSV) |
| debian:linux | 6.12.100-1 · Debian:13 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:5.14.0-687.58.1.el9_8 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
+5
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (2)
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- git.kernel.org/stable/c/238c612357b5a25f03eacf356f95034f8551f218
- git.kernel.org/stable/c/65d35cb555f40529a9edc6bf4beaa3bee917f015
- git.kernel.org/stable/c/87ff022a58788ff4a25cf2c609b9abae418c9323
- git.kernel.org/stable/c/e6107a4c74b54cb33e3bce162a63048ae5a6b198
- git.kernel.org/stable/c/ef0c7d4b04a0e6ad175323c24bc84e11470dd79d
Vendor advisories and official records. Exploit/PoC links are deliberately left out.