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    CVE-2026-50260

    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.

    Published:Jun 2, 2026
    Last Modified:Aug 4, 2026
    EPS:Jun 5, 2026
    EPSS Score:0.00154
    CVSS Score:7.8

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Eus
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    X.org
    Product
    X Server
    Vendor
    X.org
    Product
    Xorg-server
    Vendor
    X.org
    Product
    Xwayland

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://access.redhat.com/errata/RHSA-2026:26562
    https://access.redhat.com/errata/RHSA-2026:26566
    https://access.redhat.com/errata/RHSA-2026:26590
    https://access.redhat.com/errata/RHSA-2026:26610
    https://access.redhat.com/errata/RHSA-2026:26709
    https://access.redhat.com/errata/RHSA-2026:28923
    https://access.redhat.com/errata/RHSA-2026:29844
    https://access.redhat.com/errata/RHSA-2026:36083
    https://access.redhat.com/errata/RHSA-2026:36085
    https://access.redhat.com/errata/RHSA-2026:36086
    https://access.redhat.com/errata/RHSA-2026:36087
    https://access.redhat.com/errata/RHSA-2026:36632
    https://access.redhat.com/errata/RHSA-2026:36633
    https://access.redhat.com/errata/RHSA-2026:36634
    https://access.redhat.com/errata/RHSA-2026:36768
    https://access.redhat.com/errata/RHSA-2026:36791
    https://access.redhat.com/errata/RHSA-2026:36792
    https://access.redhat.com/errata/RHSA-2026:36798
    https://access.redhat.com/errata/RHSA-2026:38502
    https://access.redhat.com/errata/RHSA-2026:38810
    https://access.redhat.com/errata/RHSA-2026:46377
    https://access.redhat.com/errata/RHSA-2026:46382
    https://access.redhat.com/errata/RHSA-2026:46385
    https://access.redhat.com/errata/RHSA-2026:46392
    https://access.redhat.com/errata/RHSA-2026:46456
    https://access.redhat.com/errata/RHSA-2026:46460
    https://access.redhat.com/errata/RHSA-2026:46473
    https://access.redhat.com/errata/RHSA-2026:49519
    https://access.redhat.com/security/cve/CVE-2026-50260
    https://bugzilla.redhat.com/show_bug.cgi?id=2485385
    https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b
    https://lists.x.org/archives/xorg-announce/2026-June/003702.html
    https://redhat.atlassian.net/browse/PSIRTSUPT-16950
    https://access.redhat.com/errata/RHSA-2026:26562
    https://access.redhat.com/errata/RHSA-2026:26566
    https://access.redhat.com/errata/RHSA-2026:26590
    https://access.redhat.com/errata/RHSA-2026:26610
    https://access.redhat.com/errata/RHSA-2026:26709
    https://access.redhat.com/errata/RHSA-2026:28923
    https://access.redhat.com/errata/RHSA-2026:29844
    https://access.redhat.com/errata/RHSA-2026:36083
    https://access.redhat.com/errata/RHSA-2026:36085
    https://access.redhat.com/errata/RHSA-2026:36086
    https://access.redhat.com/errata/RHSA-2026:36087
    https://access.redhat.com/errata/RHSA-2026:36632
    https://access.redhat.com/errata/RHSA-2026:36633
    https://access.redhat.com/errata/RHSA-2026:36634
    https://access.redhat.com/errata/RHSA-2026:36768
    https://access.redhat.com/errata/RHSA-2026:36791
    https://access.redhat.com/errata/RHSA-2026:36792
    https://access.redhat.com/errata/RHSA-2026:36798
    https://access.redhat.com/errata/RHSA-2026:38502
    https://access.redhat.com/errata/RHSA-2026:38810
    https://access.redhat.com/errata/RHSA-2026:46377
    https://access.redhat.com/errata/RHSA-2026:46382
    https://access.redhat.com/errata/RHSA-2026:46385
    https://access.redhat.com/errata/RHSA-2026:46392
    https://access.redhat.com/errata/RHSA-2026:46456
    https://access.redhat.com/errata/RHSA-2026:46460
    https://access.redhat.com/errata/RHSA-2026:46473
    https://access.redhat.com/errata/RHSA-2026:49519
    https://access.redhat.com/security/cve/CVE-2026-50260
    https://bugzilla.redhat.com/show_bug.cgi?id=2485385
    https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50260.json

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High