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NVD / CVE Program· CNA Linux

CVE-2026-53219: netfilter: x_tables: avoid leaking percpu counter pointers

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.12% (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 08a3e218064db11f154ad9ad5541751ea7f34ebe, 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45, 8d67e42ad3b1a95a152541015a07110e06992d6c; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.

Low priority for now. Upgrade to Linux Linux 08a3e218064db11f154ad9ad5541751ea7f34ebe, 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45, 8d67e42ad3b1a95a152541015a07110e06992d6c; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 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: x_tables: avoid leaking percpu counter pointers The native and compat get-entries paths copy the fixed rule entry header from the kernelized rule blob to userspace before overwriting the entry's counter fields with a sanitized counter snapshot. On SMP kernels, entry->counters.pcnt contains the percpu allocation address used by x_tables rule counters. A caller can provide a userspace buffer that faults during the initial fixed-header copy after pcnt has been copied but before the later sanitized counter copy runs. The syscall then returns -EFAULT while leaving the raw percpu pointer in userspace. Copy only the fixed entry prefix before counters from the kernelized rule blob, then copy the sanitized counter snapshot into the counter field. Apply this ordering to the IPv4, IPv6, and ARP native and compat get-entries implementations so a fault cannot expose the internal percpu counter pointer.

Published
Jun 25, 2026
Updated
Nov 10, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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.

Follow CVE-2026-53219

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

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

    • 4.2affected
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before b74ba3343eb44b2cbf7e9665918c287df1d52ebbaffected · git
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before 0b35dc8527ccc16b7dc34e8a3164313e68cd4e45affected · git
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before b28e2fcad3db7e8687b15bc20bced26b5b7c920eaffected · git
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before a0d16941adf3a501956d74aefd8d6e217906e79caffected · git
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before 8d67e42ad3b1a95a152541015a07110e06992d6caffected · git
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before 08a3e218064db11f154ad9ad5541751ea7f34ebeaffected · git
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before fb0521aff1e10e300d89725cc439d3ea74c828c5affected · git
    • 71ae0dff02d756e4d2ca710b79f2ff5390029a5f and later · before f7f2fbb0e893a0238dc464f8d8c0f5609bec584faffected · git
    • before 4.2not affected · semver
Affected versions · NVD (8)

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

  • linux linux kernel4.2 and later · before 5.10.259
  • linux linux kernel5.11 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 kernel7.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.13-17.0.13-1

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-2026-53217Jun 25, 2026 · net: mvpp2: sync RX data at the hardware packet offset
    34Monitor
  • ← EarlierCVE-2026-53218Jun 25, 2026 · netfilter: nft_exthdr: fix register tracking for F_PRESENT flag
    22Monitor
  • Later →CVE-2026-53220Jun 25, 2026 · netfilter: revalidate bridge ports
    22Monitor

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 Linux08a3e218064db11f154ad9ad5541751ea7f34ebeVendor (CNA)
Linux Linux0b35dc8527ccc16b7dc34e8a3164313e68cd4e45Vendor (CNA)
Linux Linux8d67e42ad3b1a95a152541015a07110e06992d6cVendor (CNA)
Linux Linuxa0d16941adf3a501956d74aefd8d6e217906e79cVendor (CNA)
Linux Linuxb28e2fcad3db7e8687b15bc20bced26b5b7c920eVendor (CNA)
Linux Linuxb74ba3343eb44b2cbf7e9665918c287df1d52ebbVendor (CNA)
Linux Linuxf7f2fbb0e893a0238dc464f8d8c0f5609bec584fVendor (CNA)
Linux Linuxfb0521aff1e10e300d89725cc439d3ea74c828c5Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

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.

References

Show all references (10 more)

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

All records