CVE-2026-53236
MEDIUM severity · CVSS 5.5
5.5CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6a ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/3747de241a66ef2c7032d2cc2b826a47c5fa0f6aPatch
- https://git.kernel.org/stable/c/5d39580f68e6ddeedd15e587282207489dfb3da2Patch
- https://git.kernel.org/stable/c/82b3e7ce10c53fc12aab8904745603efc74f8c07Patch
- https://git.kernel.org/stable/c/c68517a3e18e20997808821c5559d0cba4d776c1Patch
- https://git.kernel.org/stable/c/ecfe9171b26ae3eed0cd8bab7a943e9e2c9e51baPatch
- https://git.kernel.org/stable/c/ede69b8f6670600e534591664584f810d7c385f9Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html