rhsa-2025:2500
Vulnerability from csaf_redhat
Published
2025-03-10 12:40
Modified
2025-03-27 04:22
Summary
Red Hat Security Advisory: tigervnc security update
Notes
Topic
An update for tigervnc is now available for Red Hat Enterprise Linux 9.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
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.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
{ document: { aggregate_severity: { namespace: "https://access.redhat.com/security/updates/classification/", text: "Important", }, category: "csaf_security_advisory", csaf_version: "2.0", distribution: { text: "Copyright © Red Hat, Inc. All rights reserved.", tlp: { label: "WHITE", url: "https://www.first.org/tlp/", }, }, lang: "en", notes: [ { category: "summary", text: "An update for tigervnc is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.", title: "Topic", }, { category: "general", text: "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.\n\nSecurity Fix(es):\n\n* X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)\n\n* xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)\n\n* xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)\n\n* xorg: xwayland: Use of uninitialized pointer in compRedirectWindow() (CVE-2025-26599)\n\n* xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient() (CVE-2025-26598)\n\n* xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)\n\n* xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)\n\n* Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)\n\nFor 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.", title: "Details", }, { category: "legal_disclaimer", text: "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", title: "Terms of Use", }, ], publisher: { category: "vendor", contact_details: "https://access.redhat.com/security/team/contact/", issuing_authority: "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", name: "Red Hat Product Security", namespace: "https://www.redhat.com", }, references: [ { category: "self", summary: "https://access.redhat.com/errata/RHSA-2025:2500", url: "https://access.redhat.com/errata/RHSA-2025:2500", }, { category: "external", summary: "https://access.redhat.com/security/updates/classification/#important", url: "https://access.redhat.com/security/updates/classification/#important", }, { category: "external", summary: "2345248", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345248", }, { category: "external", summary: "2345251", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345251", }, { category: "external", summary: "2345252", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345252", }, { category: "external", summary: "2345253", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345253", }, { category: "external", summary: "2345254", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345254", }, { category: "external", summary: "2345255", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345255", }, { category: "external", summary: "2345256", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345256", }, { category: "external", summary: "2345257", url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345257", }, { category: "self", summary: "Canonical URL", url: "https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_2500.json", }, ], title: "Red Hat Security Advisory: tigervnc security update", tracking: { current_release_date: "2025-03-27T04:22:09+00:00", generator: { date: "2025-03-27T04:22:09+00:00", engine: { name: "Red Hat SDEngine", version: "4.4.1", }, }, id: "RHSA-2025:2500", initial_release_date: "2025-03-10T12:40:38+00:00", revision_history: [ { date: "2025-03-10T12:40:38+00:00", number: "1", summary: "Initial version", }, { date: "2025-03-10T12:40:38+00:00", number: "2", summary: "Last updated version", }, { date: "2025-03-27T04:22:09+00:00", number: "3", summary: "Last generated version", }, ], status: "final", version: "3", }, }, product_tree: { branches: [ { branches: [ { branches: [ { category: "product_name", name: "Red Hat Enterprise Linux AppStream (v. 9)", product: { name: "Red Hat Enterprise Linux AppStream (v. 9)", product_id: "AppStream-9.5.0.Z.MAIN", product_identification_helper: { cpe: "cpe:/a:redhat:enterprise_linux:9::appstream", }, }, }, ], category: "product_family", name: "Red Hat Enterprise Linux", }, { branches: [ { category: "product_version", name: "tigervnc-0:1.14.1-1.el9_5.1.src", product: { name: 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[ { category: "product_version", name: "tigervnc-0:1.14.1-1.el9_5.1.s390x", product: { name: "tigervnc-0:1.14.1-1.el9_5.1.s390x", product_id: "tigervnc-0:1.14.1-1.el9_5.1.s390x", product_identification_helper: { purl: "pkg:rpm/redhat/tigervnc@1.14.1-1.el9_5.1?arch=s390x", }, }, }, { category: "product_version", name: "tigervnc-server-0:1.14.1-1.el9_5.1.s390x", product: { name: "tigervnc-server-0:1.14.1-1.el9_5.1.s390x", product_id: "tigervnc-server-0:1.14.1-1.el9_5.1.s390x", product_identification_helper: { purl: "pkg:rpm/redhat/tigervnc-server@1.14.1-1.el9_5.1?arch=s390x", }, }, }, { category: "product_version", name: "tigervnc-server-minimal-0:1.14.1-1.el9_5.1.s390x", product: { name: "tigervnc-server-minimal-0:1.14.1-1.el9_5.1.s390x", product_id: "tigervnc-server-minimal-0:1.14.1-1.el9_5.1.s390x", product_identification_helper: { purl: "pkg:rpm/redhat/tigervnc-server-minimal@1.14.1-1.el9_5.1?arch=s390x", }, }, }, { category: "product_version", name: 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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.", title: "Vulnerability description", }, { category: "summary", text: "X.Org: Xwayland: Use-after-free of the root cursor", title: "Vulnerability summary", }, { category: "other", text: "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.aarch64", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.ppc64le", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.s390x", 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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.", title: "Vulnerability description", }, { category: "summary", text: "Xorg: xwayland: Buffer overflow in XkbVModMaskText()", title: "Vulnerability summary", }, { category: "other", text: "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.aarch64", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.ppc64le", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.s390x", 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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.", title: "Vulnerability description", }, { category: "summary", text: "xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey()", title: "Vulnerability summary", }, { category: "other", text: "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.aarch64", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.ppc64le", 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name: "Out-of-bounds Write", }, discovery_date: "2025-02-12T14:15:01.664000+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "2345254", }, ], notes: [ { category: "description", text: "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.", title: "Vulnerability description", }, { category: "summary", text: "xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient()", title: "Vulnerability summary", }, { category: "other", text: "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.aarch64", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.ppc64le", 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"CWE-824", name: "Access of Uninitialized Pointer", }, discovery_date: "2025-02-12T14:15:01.808000+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "2345253", }, ], notes: [ { category: "description", text: "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.", title: "Vulnerability description", }, { category: "summary", text: "xorg: xwayland: Use of uninitialized pointer in compRedirectWindow()", title: "Vulnerability summary", }, { category: "other", text: "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.aarch64", 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"CWE-416", name: "Use After Free", }, discovery_date: "2025-02-12T14:15:01.957000+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "2345252", }, ], notes: [ { category: "description", text: "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.", title: "Vulnerability description", }, { category: "summary", text: "xorg: xwayland: Use-after-free in PlayReleasedEvents()", title: "Vulnerability summary", }, { category: "other", text: "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.aarch64", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.ppc64le", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.s390x", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.src", 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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.", title: "Vulnerability description", }, { category: "summary", text: "xorg: xwayland: Use-after-free in SyncInitTrigger()", title: "Vulnerability summary", }, { category: "other", text: "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity.", title: "Statement", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.aarch64", "AppStream-9.5.0.Z.MAIN:tigervnc-0:1.14.1-1.el9_5.1.ppc64le", 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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.