rhsa-2025_2502
Vulnerability from csaf_redhat
Published
2025-03-10 12:50
Modified
2025-03-21 15:57
Summary
Red Hat Security Advisory: tigervnc security update
Notes
Topic
An update for tigervnc is now available for Red Hat Enterprise Linux 8.
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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"title": "X.Org: Xwayland: Use-after-free of the root cursor"
},
{
"cve": "CVE-2025-26595",
"cwe": {
"id": "CWE-121",
"name": "Stack-based Buffer Overflow"
},
"discovery_date": "2025-02-12T14:15:00.929000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2345257"
}
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{
"category": "description",
"text": "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.",
"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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"title": "Xorg: xwayland: Buffer overflow in XkbVModMaskText()"
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{
"cve": "CVE-2025-26596",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
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{
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"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "xorg: xwayland: Heap overflow in XkbWriteKeySyms()",
"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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "xorg: xwayland: Heap overflow in XkbWriteKeySyms()"
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{
"cve": "CVE-2025-26597",
"cwe": {
"id": "CWE-119",
"name": "Improper Restriction of Operations within the Bounds of a Memory Buffer"
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{
"category": "description",
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"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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey()"
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{
"cve": "CVE-2025-26598",
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"name": "Out-of-bounds Write"
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{
"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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"title": "xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient()"
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{
"cve": "CVE-2025-26599",
"cwe": {
"id": "CWE-824",
"name": "Access of Uninitialized Pointer"
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"text": "2345253"
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{
"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\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-26599"
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"release_date": "2025-02-25T00:00:00+00:00",
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"category": "vendor_fix",
"date": "2025-03-10T12:50:48+00:00",
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"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"
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{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
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{
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"text": "xorg: xwayland: Use-after-free in SyncInitTrigger()",
"title": "Vulnerability summary"
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"title": "Statement"
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
"category": "external",
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"release_date": "2025-02-25T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2025-03-10T12:50:48+00:00",
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"url": "https://access.redhat.com/errata/RHSA-2025:2502"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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"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",
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"title": "xorg: xwayland: Use-after-free in SyncInitTrigger()"
}
]
}
Loading...
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- 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.