CVE-2026-93542— Out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes()
Quick assessment
Affected
x.org libXi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 libXi 1.8.4 之前的版本中，libXi 的 XI2 类解析函数 size_classes() 和 copy_classes() 存在越界读取漏洞。恶意服务器可利用此漏洞导致 X 客户端崩溃。
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I. Basic Information for CVE-2026-93542
Vulnerability Information
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Vulnerability Title
Out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes()
Source: CVE Program / CVE List V5
Vulnerability Description
An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before 1.8.4 could be used by malicous servers to crash the X client.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-93542
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-93542 (1)
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Sign in · GitLab patch
Same Patch Batch · x.org · 2026-09-24 · 6 CVEs total
| CVE-2026-93543 | 7.4 HIGH | Out-of-bounds read in libXi's XI2 class parser |
| CVE-2026-93545 | 6.5 MEDIUM | Out-of-bounds read in libXi's XListInputDevices() |
| CVE-2026-93544 | 6.5 MEDIUM | Out-of-bounds read in libXi's XI2 XIQueryDevice reply parsing |
| CVE-2026-93541 | 6.5 MEDIUM | Out-of-bounds read in libXi's XQueryDeviceState() |
| CVE-2026-94281 | 6.5 MEDIUM | Out-of-bounds read in libXi's XListInputDevices() class parsing |
IV. Related Vulnerabilities
Same product: libXi
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CVE-2026-94282
Out-of-bounds read in libXi's XI2 enter/leave/focus cookie c -
CVE-2026-94281
Out-of-bounds read in libXi's XListInputDevices() class pars -
CVE-2026-93545
Out-of-bounds read in libXi's XListInputDevices() -
CVE-2026-93544
Out-of-bounds read in libXi's XI2 XIQueryDevice reply parsin -
CVE-2026-93543
Out-of-bounds read in libXi's XI2 class parser
Same vendor: x.org
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CVE-2026-94287
Denial of service via unsigned underflow in libXpm's write p -
CVE-2026-94286
Out-of-bounds read in libXtst's RECORD reply parser -
CVE-2026-94285
Out-of-bounds read in libX11's byte-oriented codeset parser -
CVE-2026-94284
Out-of-bounds read vulnerability in libX11's XIM trigger-key -
CVE-2026-94283
Out-of-bounds read vulnerability in libX11's XIM (X Input Me
Same weakness: CWE-125
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CVE-2026-94285
Out-of-bounds read in libX11's byte-oriented codeset parser -
CVE-2026-94284
Out-of-bounds read vulnerability in libX11's XIM trigger-key -
CVE-2026-94283
Out-of-bounds read vulnerability in libX11's XIM (X Input Me -
CVE-2026-94282
Out-of-bounds read in libXi's XI2 enter/leave/focus cookie c -
CVE-2026-100505
Ghidra 11.2 through 12.1.4 Heap Out-of-Bounds Read via Strin
V. Comments for CVE-2026-93542
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