CVE-2026-53236 Details
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.
A vulnerability in the Linux kernel's handling of TCP sockets has been addressed by restricting the use of SO_ATTACH_FILTER (cBPF) to users with CAP_NET_ADMIN capability. This change prevents unprivileged applications from attaching filters that could leak TCP sequence and acknowledgment numbers, thereby blocking a potential side-channel attack.
Users can update to the latest version of the Linux kernel where this vulnerability has been patched. Instructions for updating the Linux kernel can be found in the official Linux documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-019113.html | siemens-SADP | |
| https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a | kernel.org | Patch |
| https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2 | kernel.org | Patch |
| https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07 | kernel.org | Patch |
| https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba | kernel.org | Patch |
| https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.12.1, < 6.1.176 >= 6.2, < 6.6.143 >= 6.7, < 6.12.94 >= 6.13, < 6.18.36 >= 6.19, < 7.0.13 2.6.12 - 2.6.12 rc2 2.6.12 rc3 2.6.12 rc4 2.6.12 rc5 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 7.1 rc5 7.1 rc6 7.1 rc7 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 8, 2026 | CVE Modified | kernel.org |
| Sep 8, 2026 | CVE Modified | siemens-SADP |
| Jul 8, 2026 | Initial Analysis | [email protected] |
| Jun 25, 2026 | New CVE Received | kernel.org |