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    CVE-2025-26599

    An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.

    Published:Feb 25, 2025
    Last Modified:Jun 29, 2026
    EPS:Feb 25, 2025
    EPSS Score:0.0036
    CVSS Score:7.8

    Affected Products

    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Tigervnc
    Product
    Tigervnc
    Vendor
    X.org
    Product
    X Server
    Vendor
    X.org
    Product
    Xwayland

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-824 Access of Uninitialized Pointer

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    https://access.redhat.com/errata/RHSA-2025:2500
    https://access.redhat.com/errata/RHSA-2025:2502
    https://access.redhat.com/errata/RHSA-2025:2861
    https://access.redhat.com/errata/RHSA-2025:2862
    https://access.redhat.com/errata/RHSA-2025:2865
    https://access.redhat.com/errata/RHSA-2025:2866
    https://access.redhat.com/errata/RHSA-2025:2873
    https://access.redhat.com/errata/RHSA-2025:2874
    https://access.redhat.com/errata/RHSA-2025:2875
    https://access.redhat.com/errata/RHSA-2025:2879
    https://access.redhat.com/errata/RHSA-2025:2880
    https://access.redhat.com/errata/RHSA-2025:3976
    https://access.redhat.com/errata/RHSA-2025:7163
    https://access.redhat.com/errata/RHSA-2025:7165
    https://access.redhat.com/errata/RHSA-2025:7458
    https://access.redhat.com/security/cve/CVE-2025-26599
    https://bugzilla.redhat.com/show_bug.cgi?id=2345253
    https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html

    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