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NVD / CVE Program· CNA Linux

CVE-2026-53236: tcp: restrict SO_ATTACH_FILTER to priv users

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 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a, 5d39580f68e6ddeedd15e587282207489dfb3da2, 82b3e7ce10c53fc12aab8904745603efc74f8c07; 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 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a, 5d39580f68e6ddeedd15e587282207489dfb3da2, 82b3e7ce10c53fc12aab8904745603efc74f8c07; 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: tcp: restrict SO_ATTACH_FILTER to priv users This patch restricts the use of SO_ATTACH_FILTER (cBPF) on TCP sockets to users with CAP_NET_ADMIN capability. This blocks potential side-channel attack where an unprivileged application attaches a filter to leak TCP sequence/acknowledgment numbers.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 25, 2026
Updated
Oct 15, 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%

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-2026-53236

When you'll hear from us

  • when it enters CISA KEV
  • 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 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
  • linux linux kernel7.1

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 3747de241a66ef2c7032d2cc2b826a47c5fa0f6aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51baaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 82b3e7ce10c53fc12aab8904745603efc74f8c07affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ede69b8f6670600e534591664584f810d7c385f9affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c68517a3e18e20997808821c5559d0cba4d776c1affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 5d39580f68e6ddeedd15e587282207489dfb3da2affected · git
    • before 2.6.12not affected · semver
    • 6.1.176 and later · up to and including 6.1.*not affected · semver
    • 6.6.143 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.

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.69.1.el10_26.12.0-211.69.1.el10_2

+92

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-2026-53230Jun 25, 2026 · net/mlx5: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac_list
    34Monitor
  • ← EarlierCVE-2026-53232Jun 25, 2026 · net: phy: clean the sfp upstream if phy probing fails
    35Monitor
  • Later →CVE-2026-53237Jun 25, 2026 · gpio: mvebu: fix NULL pointer dereference in suspend/resume
    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 Linux3747de241a66ef2c7032d2cc2b826a47c5fa0f6aVendor (CNA)
Linux Linux5d39580f68e6ddeedd15e587282207489dfb3da2Vendor (CNA)
Linux Linux82b3e7ce10c53fc12aab8904745603efc74f8c07Vendor (CNA)
Linux Linuxc68517a3e18e20997808821c5559d0cba4d776c1Vendor (CNA)
Linux Linuxecfe9171b26ae3eed0cd8bab7a943e9e2c9e51baVendor (CNA)
Linux Linuxede69b8f6670600e534591664584f810d7c385f9Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.178.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.178.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.178.1.rt7.519.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
rocky linux:kernel0:4.18.0-553.178.1.el8_10 · Rocky Linux:8Package registry (OSV)
rocky linux:kernel-rt0:4.18.0-553.178.1.rt7.519.el8_10 · Rocky Linux:8Package 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.

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

  • 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.

Change log

  1. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records