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NVD / CVE Program· CNA Linux

CVE-2026-53131: netfilter: require Ethernet MAC header before using eth_hdr()

Noroxi assessment

Priority: Monitor (action score 37/100)

  • 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: 0.43% (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 063f43361e884acd7300790e90194430275d0d0c, 367abcacc13a8e2e7624408b7f593bd1e60e49d9, 4435888e1bf139d2bfe5911643d4217382136743.

Low priority for now. Upgrade to Linux Linux 063f43361e884acd7300790e90194430275d0d0c, 367abcacc13a8e2e7624408b7f593bd1e60e49d9, 4435888e1bf139d2bfe5911643d4217382136743 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: require Ethernet MAC header before using eth_hdr() `ip6t_eui64`, `xt_mac`, the `bitmap:ip,mac`, `hash:ip,mac`, and `hash:mac` ipset types, and `nf_log_syslog` access `eth_hdr(skb)` after either assuming that the skb is associated with an Ethernet device or checking only that the `ETH_HLEN` bytes at `skb_mac_header(skb)` lie between `skb->head` and `skb->data`. Make these paths first verify that the skb is associated with an Ethernet device, that the MAC header was set, and that it spans at least a full Ethernet header before accessing `eth_hdr(skb)`.

CriticalCVSS 9.4 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Oct 19, 2026
EPSS
0.4% · 37th percentile

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
37 / 40 · 9.4 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.4
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

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Follow CVE-2026-53131

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

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Affected 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.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.12.1 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.94
  • linux linux kernel6.13 and later · before 6.18.36
  • linux linux kernel6.19 and later · before 7.0.13
  • linux linux kernel2.6.12

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 4435888e1bf139d2bfe5911643d4217382136743affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 063f43361e884acd7300790e90194430275d0d0caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 726abf97566867f808fec9d8a408eb9698bd570aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 367abcacc13a8e2e7624408b7f593bd1e60e49d9affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 5d634afb8b83b49de562792fd0d047416a43bd4daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before cea435ea7e868ea6fdf039bc4f2090c1d829b556affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 62443dc21114c0bbc476fa62973db89743f2f137affected · git
    • before 2.6.12not affected · semver
    • 5.15.210 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.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.55.1.el10_26.12.0-211.55.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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 KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-53274Jun 25, 2026 · net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS
    22Monitor
  • ← EarlierCVE-2026-53276Jun 25, 2026 · Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer
    31Monitor
  • Later →CVE-2026-53132Jun 25, 2026 · vsock/virtio: fix potential unbounded skb queue
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux063f43361e884acd7300790e90194430275d0d0cVendor (CNA)
Linux Linux367abcacc13a8e2e7624408b7f593bd1e60e49d9Vendor (CNA)
Linux Linux4435888e1bf139d2bfe5911643d4217382136743Vendor (CNA)
Linux Linux5d634afb8b83b49de562792fd0d047416a43bd4dVendor (CNA)
Linux Linux62443dc21114c0bbc476fa62973db89743f2f137Vendor (CNA)
Linux Linux726abf97566867f808fec9d8a408eb9698bd570aVendor (CNA)
Linux Linuxcea435ea7e868ea6fdf039bc4f2090c1d829b556Vendor (CNA)
almalinux:kernel5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.42.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-687.42.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+28

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.

No history yet (it accumulates with the daily EPSS job).

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 researchers

Finders, 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

  • 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
low · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records