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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 3747de241a66ef2c7032d2cc2b826a47c5fa0f6a
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 82b3e7ce10c53fc12aab8904745603efc74f8c07
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < ede69b8f6670600e534591664584f810d7c385f9
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < c68517a3e18e20997808821c5559d0cba4d776c1
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 5d39580f68e6ddeedd15e587282207489dfb3da2
Linux Linux affected
Version Status Constraints
2.6.12 affected —
0 unaffected < 2.6.12
6.1.176 unaffected ≤ 6.1.*
6.6.143 unaffected ≤ 6.6.*
6.12.94 unaffected ≤ 6.12.*
6.18.36 unaffected ≤ 6.18.*
7.0.13 unaffected ≤ 7.0.*
7.1 unaffected ≤ *

No data.

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a cve-icon
https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2 cve-icon
https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07 cve-icon
https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1 cve-icon
https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba cve-icon
https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9 cve-icon
History

Thu, 25 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
Description 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.
Title tcp: restrict SO_ATTACH_FILTER to priv users
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-25T08:39:33.170Z

Reserved: 2026-06-09T07:44:35.393Z

Link: CVE-2026-53236

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-25T11:30:06Z

Weaknesses

No weakness.