# CVE-2026-56297: freerdp3-shadow-x11: FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due... CVE-2026-56297 is fixed in 23 products on 1 platform, first by DEBIAN-CVE-2026-56297, released July 10, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-56297 - Priority: High - CVSS: 8.1 (Medium) - EPSS: 0.0047 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jul 8, 2026 ## Description FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | freerdp amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp sles 15.7 | 3.10.3-150700.3.17.1 | [SUSE-SU-2026:3562-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3562-1.md) | Aug 10, 2026 | | Linux | freerdp-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp-debugsource amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp-libs amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp-libs-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp-server amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp-server-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | freerdp3 Debian 14 | 3.22.0+dfsg-1 | [DEBIAN-CVE-2026-56297](https://patchblox.com/security/data/fix/linux/debian-cve-2026-56297.md) | Jul 10, 2026 | | Linux | freerdp3-shadow-x11 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [freerdp3-shadow-x11 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-freerdp3-shadow-x11-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | freerdp3-wayland Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [freerdp3-wayland 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-freerdp3-wayland-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | freerdp3-x11 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [freerdp3-x11 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-freerdp3-x11-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | libfreerdp-client3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-client3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-client3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | libfreerdp-server3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-server3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-server3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | libfreerdp-shadow-subsystem3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-shadow-subsystem3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-shadow-subsystem3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | libfreerdp-shadow3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp-shadow3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp-shadow3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | libfreerdp3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libfreerdp3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libfreerdp3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | libwinpr amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | libwinpr-debuginfo amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | libwinpr-devel amzn 2023 | 2:3.6.3-1.amzn2023.0.13 | [ALAS2023-2026-2012](https://patchblox.com/security/data/fix/linux/alas2023-2026-2012.md) | Aug 3, 2026 | | Linux | libwinpr-tools3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libwinpr-tools3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwinpr-tools3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | libwinpr3-3 Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [libwinpr3-3 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libwinpr3-3-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | | Linux | winpr3-utils Ubuntu 24.04.5 LTS (noble) | 3.30.0+dfsg-0ubuntu0.24.04.1 | [winpr3-utils 3.30.0+dfsg-0ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-winpr3-utils-3.30.0-dfsg-0ubuntu0.24.04.1.md) | Jul 23, 2026 | --- Data as of 2026-11-09T13:31:49Z UTC. 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