Bug 2492709 (CVE-2026-53236) - CVE-2026-53236 kernel: tcp: restrict SO_ATTACH_FILTER to priv users
Summary: CVE-2026-53236 kernel: tcp: restrict SO_ATTACH_FILTER to priv users
Keywords:
Status: NEW
Alias: CVE-2026-53236
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-25 10:01 UTC by OSIDB Bzimport
Modified: 2026-06-26 10:40 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-06-25 10:01:40 UTC 
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.
Comment 1 Mauro Matteo Cascella 2026-06-26 10:39:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062510-CVE-2026-53236-45bc@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.