PT-2026-52331 · Linux+1 · Linux Kernel+1
CVE-2026-53236
·
Published
2026-06-08
·
Updated
2026-09-07
CVSS v2.0
6.0
Medium
| Vector | AV:L/AC:H/Au:S/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
A side-channel issue exists where an unprivileged application can attach a filter to TCP sockets to leak TCP sequence and acknowledgment numbers. This is achieved through the use of
SO ATTACH FILTER (cBPF), which allows the attachment of classic Berkeley Packet Filters to sockets.Recommendations
Restrict the use of
SO ATTACH FILTER on TCP sockets to users with CAP NET ADMIN capability.Exploit
Fix
Incorrect Privilege Assignment
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel
Ubuntu