Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()
CVSS score
7.8
EPSS probability
%0.2
Risk score
0.0
Published
4 mo ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-50260 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-50260 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Red Hat | Red Hat Enterprise Linux 10 | View |
| 2 | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | View |
| 3 | Red Hat | Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | View |
| 4 | Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | View |
| 5 | Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | View |
| 6 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 7 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 8 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 9 | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | View |
| 10 | Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | View |
| 11 | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | View |
| 12 | Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | View |
| 13 | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | View |
| 14 | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | View |
| 15 | Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | View |
| 16 | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | View |
| 17 | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | View |
| 18 | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | View |
| 19 | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | View |
| 20 | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | View |
| 21 | Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | View |
| 22 | Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | View |
| 23 | Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | View |
| 24 | Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | View |
| 25 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 26 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 27 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 28 | Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | View |
| 29 | Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | View |
| 30 | Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | View |
| 31 | Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | View |
| 32 | Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | View |
| 33 | Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | View |
| 34 | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | View |
| 35 | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | View |
| 36 | Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | View |
| 37 | Red Hat | Red Hat Enterprise Linux 6 | View |
| 38 | x.org | x server | View |
| 39 | x.org | xwayland | View |
| 40 | redhat | enterprise linux | View |
| 41 | redhat | enterprise linux | View |
| 42 | redhat | enterprise linux | View |
| 43 | redhat | enterprise linux | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 7.8 | CVSS V31 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD |
| 7.8 | CVSS V3_1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CVE CNA |
| 7.8 | CVSS V3_1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CVE ADP |
| 6.6 | CVSS 3.x | — | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H | Microsoft MSRC |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-50260 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-50260 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
Get this vulnerability through the API
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curl -H "x-api-key: $DAYBREACH_API_KEY" \ "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-50260"