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CVE-2026-93518

X.Org Server XKB ResizeKeyType Numeric Truncation

CVSS score

7.8

EPSS probability

—

Risk score

0.8

Published

1 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
A patch is available only for some products or versions

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-93518: X.Org Server and XWayland XKB ResizeKeyType Numeric Truncation Vulnerability

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

CVE-2026-93518 is a numeric truncation issue affecting the XkbResizeKeyType function in X.org X server and XWayland components [S0]. It allows authenticated X clients to trigger a heap buffer overflow, potentially leading to code execution or server crashes [S0].

Why does it matter?

This vulnerability enables authenticated local clients to execute code with high impact on the X server [S0]. Applying patches is crucial to mitigate this critical risk to system integrity [S0].

What should be done?

  • Follow vendor advisories
  • Update X.org X server and XWayland components
  • Review the provided patch references
Chain of evidence and sources2 verified claims

CVE-2026-93518, XkbResizeKeyType fonksiyonunda tamsayı kırpma sorununa dayanmaktadır [S0].

S0 · daybreach-canonical

21.1.25 öncesi X.org X server ve 24.1.14 öncesi XWayland sürümleri etkilenmektedir [S0].

S0 · daybreach-canonical
Show the technical text from the sources

An integer truncation issue in XkbResizeKeyType() that could lead to a heap buffer overflow by authenticated X clients in X.org X server before 21.1.25 and XWayland before 24.1.14 could be exploited for crashes or potential code execution in the X server.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-122

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-93518 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1x.orgxorg-x11-server View
2x.orgxwayland View
3Ubuntuxorg (xenial) View
4Ubuntuxorg (bionic) View
5Ubuntuxorg (focal) View
6Ubuntuxorg (jammy) View
7Ubuntuxorg (noble) View
8Ubuntuxorg (resolute) View
9Ubuntuxorg (stonking) View
10Ubuntuxorg (upstream) View
11Ubuntuxorg-server (trusty) View
12Ubuntuxorg-server (xenial) View
13Ubuntuxorg-server (bionic) View
14Ubuntuxorg-server (focal) View
15Ubuntuxorg-server (jammy) View
16Ubuntuxorg-server (noble) View
17Ubuntuxorg-server (resolute) View
18Ubuntuxorg-server (stonking) View
19Ubuntuxorg-server (upstream) View
20Ubuntuxwayland (jammy) View
21Ubuntuxwayland (noble) View
22Ubuntuxwayland (resolute) View
23Ubuntuxwayland (stonking) View
24Ubuntuxwayland (upstream) View
25Ubuntuxorg-server-hwe-16.04 (xenial) View
26Ubuntuxorg-server-hwe-16.04 (jammy) View
27Ubuntuxorg-server-hwe-16.04 (noble) View
28Ubuntuxorg-server-hwe-16.04 (resolute) View
29Ubuntuxorg-server-hwe-16.04 (stonking) View
30Ubuntuxorg-server-hwe-16.04 (upstream) View
31Ubuntuxorg-server-hwe-18.04 (bionic) View
32Ubuntuxorg-server-hwe-18.04 (jammy) View
33Ubuntuxorg-server-hwe-18.04 (noble) View
34Ubuntuxorg-server-hwe-18.04 (resolute) View
35Ubuntuxorg-server-hwe-18.04 (stonking) View
36Ubuntuxorg-server-hwe-18.04 (upstream) View
37Ubuntuxorg-hwe-16.04 (xenial) View
38Ubuntuxorg-hwe-16.04 (jammy) View
39Ubuntuxorg-hwe-16.04 (noble) View
40Ubuntuxorg-hwe-16.04 (resolute) View
41Ubuntuxorg-hwe-16.04 (stonking) View
42Ubuntuxorg-hwe-16.04 (upstream) View
43Ubuntuxorg-hwe-18.04 (bionic) View
44Ubuntuxorg-hwe-18.04 (jammy) View
45Ubuntuxorg-hwe-18.04 (noble) View
46Ubuntuxorg-hwe-18.04 (resolute) View
47Ubuntuxorg-hwe-18.04 (stonking) View
48Ubuntuxorg-hwe-18.04 (upstream) View
Total affected vendors: 2|Products: 48

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

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.

SCOREVERSIONSEVERITYVECTORSOURCE
7.8CVSS V31HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD
7.8CVSS V3_1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Partial patch

2 düzeltme kanıtı bulundu; en az 18 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

cvelist

CNA çözüm referansı

Open source
reference

Yama veya çözüm referansı

Open source
Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

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-2026-93518 is associated with the following CWEs:

CWE-122: Common Weakness Enumeration Entry CWE-122

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-2026-93518 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsLow
UserGerekmiyor

Official Sources and Advisories

https://gitlab.freedesktop.org/xorg/xserver/-/commit/89101a6c6618f543d7502f2077c7ef1a507af256patchhttps://www.cve.org/CVERecord?id=CVE-2026-93518vendor-advisoryhttps://lists.x.org/archives/xorg-announce/2026-October/003747.htmlvendor-advisory

CVSS Vector Radar Chart

7.8 / 10
Attack VectorLocalComplexityLowPrivilegesLowUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow privileges
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Kısmi yama

2 düzeltme kanıtı bulundu; en az 18 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

Follow the vendor

X
x.org logo
x.org
U
Ubuntu logo
Ubuntu

Weakness Type (CWE & CAPEC)

CWE-122

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CVE-2026-93518 · X.Org Server XKB ResizeKeyType Numeric…