CVE-2026-50260: Use After Free in Red Hat Red Hat Enterprise Linux 10
A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.
AI Analysis
Technical Summary
This vulnerability involves a use-after-free condition in the FreeCounter() function of the X.Org X server and Xwayland, triggered when a client sets up multiple SyncCounters and awaits triggers, then destroys those counters through a second client connection. Exploitation may cause the X server to crash or allow privilege escalation if the server runs with root privileges. The issue affects Red Hat Enterprise Linux versions 8 (>=8 <8.10) and 10 (>=10 <10.2). Red Hat has issued security advisories RHSA-2026:26562 and RHSA-2026:26566 providing patches for these versions. The advisories also address multiple other security flaws in the same components. The CVSS v3.1 base score is 7.8, indicating high severity.
Potential Impact
Successful exploitation can lead to denial of service via server crashes or privilege escalation on affected Red Hat Enterprise Linux 8 and 10 systems running the vulnerable X.Org X server and Xwayland versions. The vulnerability is rated high severity with a CVSS score of 7.8, reflecting high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Red Hat has released official security updates that fix this vulnerability in xorg-x11-server and xorg-x11-server-Xwayland packages for Red Hat Enterprise Linux 8 and 10. Users should apply the updates as described in Red Hat advisories RHSA-2026:26562 and RHSA-2026:26566. Detailed update instructions are available at https://access.redhat.com/articles/11258. Applying these patches mitigates the vulnerability. No additional vendor-recommended mitigations are indicated.
CVE-2026-50260: Use After Free in Red Hat Red Hat Enterprise Linux 10
Description
A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a use-after-free condition in the FreeCounter() function of the X.Org X server and Xwayland, triggered when a client sets up multiple SyncCounters and awaits triggers, then destroys those counters through a second client connection. Exploitation may cause the X server to crash or allow privilege escalation if the server runs with root privileges. The issue affects Red Hat Enterprise Linux versions 8 (>=8 <8.10) and 10 (>=10 <10.2). Red Hat has issued security advisories RHSA-2026:26562 and RHSA-2026:26566 providing patches for these versions. The advisories also address multiple other security flaws in the same components. The CVSS v3.1 base score is 7.8, indicating high severity.
Potential Impact
Successful exploitation can lead to denial of service via server crashes or privilege escalation on affected Red Hat Enterprise Linux 8 and 10 systems running the vulnerable X.Org X server and Xwayland versions. The vulnerability is rated high severity with a CVSS score of 7.8, reflecting high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Red Hat has released official security updates that fix this vulnerability in xorg-x11-server and xorg-x11-server-Xwayland packages for Red Hat Enterprise Linux 8 and 10. Users should apply the updates as described in Red Hat advisories RHSA-2026:26562 and RHSA-2026:26566. Detailed update instructions are available at https://access.redhat.com/articles/11258. Applying these patches mitigates the vulnerability. No additional vendor-recommended mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-06-04T14:55:24.011Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-50260","vendor":"Red Hat"}]
Threat ID: 6a22b798e29bf47b506379f9
Added to database: 06/05/2026, 11:48:40 UTC
Last enriched: 07/30/2026, 01:42:21 UTC
Last updated: 07/31/2026, 21:26:48 UTC
Views: 115
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