netfilter: flowtable: strictly check for maximum number of actions
Noroxi assessment
Priority: Monitor (action score 31/100)
- 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: 0.19% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 504c9456699dcf4d15195ef34a0fa94a80bfc877, 5382bb03e9c33b089d60788478b922a2dca284cc, 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e.
Low priority for now. Upgrade to Linux Linux 504c9456699dcf4d15195ef34a0fa94a80bfc877, 5382bb03e9c33b089d60788478b922a2dca284cc, 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e 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: flowtable: strictly check for maximum number of actions The maximum number of flowtable hardware offload actions in IPv6 is: * ethernet mangling (4 payload actions, 2 for each ethernet address) * SNAT (4 payload actions) * DNAT (4 payload actions) * Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing) for QinQ. * Redirect (1 action) Which makes 17, while the maximum is 16. But act_ct supports for tunnels actions too. Note that payload action operates at 32-bit word level, so mangling an IPv6 address takes 4 payload actions. Update flow_action_entry_next() calls to check for the maximum number of supported actions. While at it, rise the maximum number of actions per flow from 16 to 24 so this works fine with IPv6 setups.
- ALSA-2026:23329
- ALSA-2026:26427
- ALSA-2026:26428
- ALSA-2026:30848
- RHSA-2026:23329
- RHSA-2026:26427
- RHSA-2026:26428
- RHSA-2026:27713
- RHSA-2026:30848
- RHSA-2026:33215
- RHSA-2026:33899
- RHSA-2026:33900
- RHSA-2026:34094
- RHSA-2026:34095
- RHSA-2026:35863
- RHSA-2026:35896
- RHSA-2026:55618
- RHSA-2026:55761
- RHSA-2026:55762
- RHSA-2026:55763
- Published
- May 8, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.1% · 8th percentile
- CWE
- CWE-122
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.8
- 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.
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Noroxi 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.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.5 and later · before 5.15.203
- linux linux kernel5.16 and later · before 6.1.168
- linux linux kernel6.2 and later · before 6.6.134
- linux linux kernel6.7 and later · before 6.12.81
- linux linux kernel6.13 and later · before 6.18.22
- linux linux kernel6.19 and later · before 6.19.12
- linux linux kernel7.0
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
- 5.5affected
- c29f74e0df7a02b8303bcdce93a7c0132d62577a and later · before ead66c77303f760f6c30be96e2e20d5a77cef614affected · git
- c29f74e0df7a02b8303bcdce93a7c0132d62577a and later · before fe9018d3e94329f1951b00805a8640bc06f56eadaffected · git
- c29f74e0df7a02b8303bcdce93a7c0132d62577a and later · before 5382bb03e9c33b089d60788478b922a2dca284ccaffected · git
- c29f74e0df7a02b8303bcdce93a7c0132d62577a and later · before 57c78bd2e2dd08897acd35b2bf8bcef322e36f5eaffected · git
- c29f74e0df7a02b8303bcdce93a7c0132d62577a and later · before 504c9456699dcf4d15195ef34a0fa94a80bfc877affected · git
- c29f74e0df7a02b8303bcdce93a7c0132d62577a and later · before 879959a7a2be814dd57568655eafa3d8f4d0309eaffected · git
- c29f74e0df7a02b8303bcdce93a7c0132d62577a and later · before 76522fcdbc3a02b568f5d957f7e66fc194abb893affected · git
- before 5.5not affected · semver
- 5.15.203 and later · up to and including 5.15.*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:10 | kernel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-devel-matched | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-debug-modules-extra | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-devel-matched | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-64k-modules-extra | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-abi-stablelists | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-cross-headers | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-devel-matched | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-modules | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
| AlmaLinux:10 | kernel-debug-modules-core | before 6.12.0-211.20.1.el10_2 | 6.12.0-211.20.1.el10_2 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
Published before and after this one in the same product
- ← EarlierCVE-2026-43321May 8, 2026 · bpf: Properly mark live registers for indirect jumps31Monitor
- ← EarlierCVE-2026-43325May 8, 2026 · wifi: iwlwifi: mvm: don't send a 6E related command when not supported22Monitor
- Later →CVE-2026-43332May 8, 2026 · thermal: core: Fix thermal zone device registration error path31Monitor
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 | 504c9456699dcf4d15195ef34a0fa94a80bfc877 | Vendor (CNA) |
| Linux Linux | 5382bb03e9c33b089d60788478b922a2dca284cc | Vendor (CNA) |
| Linux Linux | 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e | Vendor (CNA) |
| Linux Linux | 76522fcdbc3a02b568f5d957f7e66fc194abb893 | Vendor (CNA) |
| Linux Linux | 879959a7a2be814dd57568655eafa3d8f4d0309e | Vendor (CNA) |
| Linux Linux | ead66c77303f760f6c30be96e2e20d5a77cef614 | Vendor (CNA) |
| Linux Linux | fe9018d3e94329f1951b00805a8640bc06f56ead | Vendor (CNA) |
| almalinux:kernel | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-core | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-core | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-devel-matched | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-core | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-debug-modules-extra | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-devel | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| almalinux:kernel-64k-devel-matched | 6.12.0-211.20.1.el10_2 · AlmaLinux:10 | Package registry (OSV) |
| debian:linux | 6.1.170-1 · Debian:12 | Package registry (OSV) |
| red hat:kernel-64k-debug-debuginfo | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debug-devel-matched | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-debuginfo | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-devel | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-64k-devel-matched | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debug-debuginfo | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debug-devel | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debug-devel-matched | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
| red hat:kernel-debuginfo | 0:6.12.0-211.20.1.el10_2 · Red Hat:enterprise_linux:10.2 | Package registry (OSV) |
+3
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).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- 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
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-122 · Heap-based Buffer OverflowCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- access.redhat.com/errata/RHSA-2026:44231
- git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877
- git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc
- git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e
- git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893
- git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e
- git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614
- git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead
- access.redhat.com/errata/RHSA-2026:23329
- access.redhat.com/errata/RHSA-2026:26427
- access.redhat.com/errata/RHSA-2026:26428
- access.redhat.com/errata/RHSA-2026:27713
- access.redhat.com/errata/RHSA-2026:30848
- access.redhat.com/errata/RHSA-2026:33215
- access.redhat.com/errata/RHSA-2026:33899
- access.redhat.com/errata/RHSA-2026:33900
- access.redhat.com/errata/RHSA-2026:34094
- access.redhat.com/errata/RHSA-2026:34095
- access.redhat.com/errata/RHSA-2026:35863
Vendor advisories and official records. Exploit/PoC links are deliberately left out.