HIGH CWE-416
CVE-2026-50260
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()
Red Hat·Enterprise Linux 10
7.8/ 10
CVSS 3.1
High severity
0.15%
EPSS exploit odds
Chance of exploitation in the next 30 days
Higher than 5% of all CVEs
Not listed
CISA KEV catalog
No confirmed in-the-wild exploitation on CISA's list.
Timeline
- Published
- Jun 5, 2026
- Updated
- Nov 4, 2026
- First covered
- Jul 2, 2026
- Latest story
- 4 months ago
Summary
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.
CWE-416Use After Free
Attack profile
Attack vectorLocal
ComplexityLow
PrivilegesLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
- Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 8
References
CVE.org recordcve.org
NVD entrynvd.nist.gov
RHSA-2026:26562access.redhat.com
RHSA-2026:26566access.redhat.com
RHSA-2026:26590access.redhat.com
RHSA-2026:26610access.redhat.com
RHSA-2026:26709access.redhat.com
RHSA-2026:28923access.redhat.com
RHSA-2026:29844access.redhat.com
RHSA-2026:36083access.redhat.com