Xorg: xwayland: heap overflow in xkbwritekeysyms()
Summary
| CVE | CVE-2025-26596 |
|---|---|
| State | PUBLISHED |
| Assigner | redhat |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-02-25 16:15:38 UTC |
| Updated | 2026-04-06 13:17:15 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.000210000 probability, percentile 0.057310000 (date 2026-04-07)
Problem Types: CWE-787 | CWE-787 Out-of-bounds Write
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | [email protected] | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Redhat | Enterprise Linux | 7.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 8.0 | All | All | All |
| Operating System | Redhat | Enterprise Linux | 9.0 | All | All | All |
| Application | Tigervnc | Tigervnc | - | All | All | All |
| Application | X.org | Xwayland | All | All | All | All |
| Application | X.org | X Server | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:24.1.5-3.el10_0 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | unaffected 0:1.1.0-25.el6_10 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | unaffected 0:1.8.0-36.el7_9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | unaffected 0:1.20.4-30.el7_9 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | unaffected 0:1.13.1-15.el8_10 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.2 Advanced Update Support | unaffected 0:1.9.0-15.el8_2.13 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | unaffected 0:1.11.0-8.el8_4.12 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Telecommunications Update Service | unaffected 0:1.11.0-8.el8_4.12 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.4 Update Services For SAP Solutions | unaffected 0:1.11.0-8.el8_4.12 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | unaffected 0:1.12.0-6.el8_6.13 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | unaffected 0:1.12.0-6.el8_6.13 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions | unaffected 0:1.12.0-6.el8_6.13 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | unaffected 0:1.12.0-15.el8_8.12 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:1.14.1-1.el9_5.1 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:1.20.11-28.el9_6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9 | unaffected 0:23.2.7-3.el9_6 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions | unaffected 0:1.11.0-22.el9_0.13 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support | unaffected 0:1.12.0-14.el9_2.10 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | unaffected 0:1.13.1-8.el9_4.5 * rpm | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 6 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
| CNA | Red Hat | Red Hat Enterprise Linux 8 | Not specified | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2025:2879 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:3976 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2025:7163 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2025:7165 | [email protected] | access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | [email protected] | bugzilla.redhat.com | Issue Tracking |
| access.redhat.com/errata/RHSA-2025:2502 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:2861 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:2874 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:2862 | [email protected] | access.redhat.com | Third Party Advisory |
| lists.debian.org/debian-lts-announce/2025/02/msg00036.html | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | |
| access.redhat.com/errata/RHSA-2025:2866 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:2873 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/security/cve/CVE-2025-26596 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:2865 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:2500 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:2880 | [email protected] | access.redhat.com | Third Party Advisory |
| access.redhat.com/errata/RHSA-2025:7458 | [email protected] | access.redhat.com | |
| access.redhat.com/errata/RHSA-2025:2875 | [email protected] | access.redhat.com | Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2025-02-12T14:15:01.367Z | Reported to Red Hat. |
| CNA | 2025-02-25T00:00:00.000Z | Made public. |
Workarounds
CNA: 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.
There are currently no legacy QID mappings associated with this CVE.