Bug 2539385 (CVE-2026-96541) - CVE-2026-96541 gnome-remote-desktop: gnome-remote-desktop: unauthenticated RDP sockets lack a handshake deadline
Summary: CVE-2026-96541 gnome-remote-desktop: gnome-remote-desktop: unauthenticated RD...
Keywords:
Status: NEW
Alias: CVE-2026-96541
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: 2539563
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 12:28 UTC by OSIDB Bzimport
Modified: 2026-11-12 01:54 UTC (History)
2 users (show)

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


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:98622 0 None None None 2026-11-11 11:41:15 UTC
Red Hat Product Errata RHSA-2026:99125 0 None None None 2026-11-11 21:20:43 UTC
Red Hat Product Errata RHSA-2026:99136 0 None None None 2026-11-12 01:54:08 UTC

Description OSIDB Bzimport 2026-09-23 12:28:11 UTC
A denial-of-service flaw was found in gnome-remote-desktop's RDP connection throttling. GrdThrottler charges an accepted TCP connection against the per-source and global connection limits before authentication, but no absolute deadline requires the peer to complete the RDP handshake. An unauthenticated remote attacker can therefore keep admitted sockets open indefinitely and retain all available slots. With the default limits, an attacker able to connect from two source IP addresses can hold five connections from each address, exhaust the ten global slots, and prevent new RDP handshakes until a holding connection closes. This is an incomplete resource-exhaustion fix for CVE-2025-5024. The issue begins with the introduction of GrdThrottler in commit 959cd39a and affects releases from 50.beta onward, including 50.0 through 50.2 and the reviewed 51 prereleases and main branch. Existing authenticated sessions were not shown to terminate, and no confidentiality, integrity, or code-execution impact is claimed. The upstream report includes a reproducer and reports no released fix at the time of filing. Reported to Red Hat through PSIRTSUPT-24484.

Comment 2 errata-xmlrpc 2026-11-11 11:41:15 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:98622 https://access.redhat.com/errata/RHSA-2026:98622

Comment 3 errata-xmlrpc 2026-11-11 21:20:42 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.2 Extended Update Support

Via RHSA-2026:99125 https://access.redhat.com/errata/RHSA-2026:99125

Comment 4 errata-xmlrpc 2026-11-12 01:54:07 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.8 Extended Update Support

Via RHSA-2026:99136 https://access.redhat.com/errata/RHSA-2026:99136


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