rhsa-2025:2866
Vulnerability from csaf_redhat
Published
2025-03-17 01:16
Modified
2025-04-14 21:57
Summary
Red Hat Security Advisory: tigervnc security update

Notes

Topic
An update for tigervnc is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support. 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.


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   vulnerabilities: [
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         cwe: {
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         discovery_date: "2025-02-12T14:14:54.698000+00:00",
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               category: "description",
               text: "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.",
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            {
               cvss_v3: {
                  attackComplexity: "LOW",
                  attackVector: "LOCAL",
                  availabilityImpact: "HIGH",
                  baseScore: 7.8,
                  baseSeverity: "HIGH",
                  confidentialityImpact: "HIGH",
                  integrityImpact: "HIGH",
                  privilegesRequired: "LOW",
                  scope: "UNCHANGED",
                  userInteraction: "NONE",
                  vectorString: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  version: "3.1",
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         threats: [
            {
               category: "impact",
               details: "Important",
            },
         ],
         title: "xorg: xwayland: Use-after-free in PlayReleasedEvents()",
      },
      {
         cve: "CVE-2025-26601",
         cwe: {
            id: "CWE-416",
            name: "Use After Free",
         },
         discovery_date: "2025-02-12T14:18:30.820000+00:00",
         ids: [
            {
               system_name: "Red Hat Bugzilla ID",
               text: "2345251",
            },
         ],
         notes: [
            {
               category: "description",
               text: "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.",
               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 and are not affected by this bug.",
               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: {
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         },
         references: [
            {
               category: "self",
               summary: "Canonical URL",
               url: "https://access.redhat.com/security/cve/CVE-2025-26601",
            },
            {
               category: "external",
               summary: "RHBZ#2345251",
               url: "https://bugzilla.redhat.com/show_bug.cgi?id=2345251",
            },
            {
               category: "external",
               summary: "https://www.cve.org/CVERecord?id=CVE-2025-26601",
               url: "https://www.cve.org/CVERecord?id=CVE-2025-26601",
            },
            {
               category: "external",
               summary: "https://nvd.nist.gov/vuln/detail/CVE-2025-26601",
               url: "https://nvd.nist.gov/vuln/detail/CVE-2025-26601",
            },
         ],
         release_date: "2025-02-25T00:00:00+00:00",
         remediations: [
            {
               category: "vendor_fix",
               date: "2025-03-17T01:16:05+00:00",
               details: "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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               restart_required: {
                  category: "none",
               },
               url: "https://access.redhat.com/errata/RHSA-2025:2866",
            },
            {
               category: "workaround",
               details: "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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               cvss_v3: {
                  attackComplexity: "LOW",
                  attackVector: "LOCAL",
                  availabilityImpact: "HIGH",
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                  baseSeverity: "HIGH",
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                  integrityImpact: "HIGH",
                  privilegesRequired: "LOW",
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         threats: [
            {
               category: "impact",
               details: "Important",
            },
         ],
         title: "xorg: xwayland: Use-after-free in SyncInitTrigger()",
      },
   ],
}


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