The remote Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-a87bc329fe advisory.

    Fixes for xorg-x11-server CVEs.


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-fd490bcdcd advisory.

    CVE fix for: CVE-2025-26594, CVE-2025-26595, CVE-2025-26596, CVE-2025-26597,     CVE-2025-26598, CVE-2025-26599, CVE-2025-26600, CVE-2025-26601

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2025-7165 advisory.

    - CVE fix for: CVE-2025-26594 (RHEL-80204), CVE-2025-26595 (RHEL-80187),                    CVE-2025-26596 (RHEL-80190), CVE-2025-26597 (RHEL-80193),                    CVE-2025-26598 (RHEL-80195), CVE-2025-26599 (RHEL-80202),                    CVE-2025-26600 (RHEL-80203), CVE-2025-26601 (RHEL-80207)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of xorg-x11-server / xorg-x11-server-Xwayland installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2025-26601 advisory.

  - A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change     mask are evaluated one after the other, changing the trigger values as requested, and eventually,     SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not     adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.
    (CVE-2025-26601)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:2500 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop     environment not only on the machine where it is running, but from anywhere on the Internet and from a wide     variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)

    * xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)

    * xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)

    * xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599)

    * xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598)

    * xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)

    * xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)

    * Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:2502 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop     environment not only on the machine where it is running, but from anywhere on the Internet and from a wide     variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)

    * xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)

    * xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)

    * xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599)

    * xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598)

    * xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)

    * xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)

    * Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:2861 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop     environment not only on the machine where it is running, but from anywhere on the Internet and from a wide     variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)

    * xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)

    * xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)

    * xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599)

    * xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598)

    * xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)

    * xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)

    * Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:7163 advisory.

    X.Org is an open-source implementation of the X Window System. It provides the basic low-level     functionality that full-fledged graphical user interfaces are designed upon.

    Security Fix(es):

    * xorg-x11-server: tigervnc: heap-based buffer overflow privilege escalation vulnerability (CVE-2024-9632)

    * X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)

    * xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)

    * xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)

    * xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599)

    * xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598)

    * xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)

    * xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)

    * Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2025:2502 advisory.

    * X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)
      * xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)
      * xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)
      * xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599)
      * xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598)
      * xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)
      * xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)
      * Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the xorg-x11-server package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the     events queued for that device remain while the device is freed. Replaying the events will cause a use-     after-free.(CVE-2025-26600)

    A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change     mask are evaluated one after the other, changing the trigger values as requested, and eventually,     SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not     adding the new sync object, possibly causing a use-after-free when the alarm eventually     triggers.(CVE-2025-26601)

    A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-     sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to     check the bounds of the buffer and would copy the data regardless of the size.(CVE-2025-26595)

    An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBarrierDevice() searches for     the pointer device based on its device ID and returns the matching value, or supposedly NULL, if no match     was found. However, the code will return the last element of the list if no matching device ID is found,     which can lead to out-of-bounds memory access.
    (CVE-2025-26598)

    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.
    (CVE-2025-26599)

    A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group,     it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is     later called with a non-zero value of groups, this will cause a buffer overflow because the key actions     are of the wrong size.
    (CVE-2025-26597)

    A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server as a     global variable. If a client frees the root cursor, the internal reference points to freed memory and     causes a use-after-free.
    (CVE-2025-26594)

    A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms()     differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.
    (CVE-2025-26596)

Tenable has extracted the preceding description block directly from the EulerOS xorg-x11-server security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the xorg-x11-server package installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change     mask are evaluated one after the other, changing the trigger values as requested, and eventually,     SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not     adding the new sync object, possibly causing a use-after-free when the alarm eventually     triggers.(CVE-2025-26601)

    A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms()     differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer     overflow.(CVE-2025-26596)

    A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-     sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to     check the bounds of the buffer and would copy the data regardless of the size.(CVE-2025-26595)

    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.(CVE-2025-26599)

    A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group,     it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is     later called with a non-zero value of groups, this will cause a buffer overflow because the key actions     are of the wrong size.(CVE-2025-26597)

    A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server as a     global variable. If a client frees the root cursor, the internal reference points to freed memory and     causes a use-after-free.(CVE-2025-26594)

    A use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the     events queued for that device remain while the device is freed. Replaying the events will cause a use-     after-free.(CVE-2025-26600)

    An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBarrierDevice() searches for     the pointer device based on its device ID and returns the matching value, or supposedly NULL, if no match     was found. However, the code will return the last element of the list if no matching device ID is found,     which can lead to out-of-bounds memory access.(CVE-2025-26598)

Tenable has extracted the preceding description block directly from the EulerOS xorg-x11-server security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
232676	Fedora 40 : tigervnc (2025-a87bc329fe)	Nessus	Fedora Local Security Checks	3/13/2025	3/13/2025	high
232724	Fedora 40 : xorg-x11-server (2025-fd490bcdcd)	Nessus	Fedora Local Security Checks	3/14/2025	3/14/2025	high
237034	Oracle Linux 9 : xorg-x11-server-Xwayland (ELSA-2025-7165)	Nessus	Oracle Linux Local Security Checks	5/22/2025	5/22/2025	high
233123	Azure Linux 3.0 Security Update: xorg-x11-server / xorg-x11-server-Xwayland (CVE-2025-26601)	Nessus	Azure Linux Local Security Checks	3/20/2025	3/20/2025	high
232788	RHEL 9 : tigervnc (RHSA-2025:2500)	Nessus	Red Hat Local Security Checks	3/15/2025	6/5/2025	high
232791	RHEL 8 : tigervnc (RHSA-2025:2502)	Nessus	Red Hat Local Security Checks	3/15/2025	6/5/2025	high
233255	RHEL 7 : tigervnc (RHSA-2025:2861)	Nessus	Red Hat Local Security Checks	3/22/2025	6/5/2025	high
237332	RHEL 9 : xorg-x11-server (RHSA-2025:7163)	Nessus	Red Hat Local Security Checks	5/27/2025	6/5/2025	high
236862	AlmaLinux 8 : tigervnc (ALSA-2025:2502)	Nessus	Alma Linux Local Security Checks	5/16/2025	5/16/2025	high
238393	EulerOS 2.0 SP11 : xorg-x11-server (EulerOS-SA-2025-1681)	Nessus	Huawei Local Security Checks	6/12/2025	6/12/2025	high
241815	EulerOS 2.0 SP10 : xorg-x11-server (EulerOS-SA-2025-1813)	Nessus	Huawei Local Security Checks	7/10/2025	7/10/2025	high

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