CVE-2026-53236
Medium
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.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Linux Kernel
PublishedJun 25, 2026
First seenJun 25, 2026
How to fix
Update
- linux linux_kernel6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 or later
Patches
- git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a
- git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2
- git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07
- git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1
- git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51ba
- git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.12.1 ≤ v < 6.1.176, 6.2 ≤ v < 6.6.143, 6.7 ≤ v < 6.12.94, 6.13 ≤ v < 6.18.36, 6.19 ≤ v < 7.0.13, 2.6.12, 7.1 | 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.