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CVE-2026-42494— buffer overruns in libfsimage iso9660 handling

Quick assessment

Affected
Xen Xen
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.

Xen是Xen组织开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上,并支持在运行时进行迁移,保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于libfsimage的iso9660驱动在目录和Rock Ridge/SUSP遍历时从攻击者控制的磁盘字段直接获取多个长度而未验证，可能导致缓冲区溢出，使用pygrub的客户机可提升权限至主机控制。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-497 unknown
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I. Basic Information for CVE-2026-42494

Vulnerability Information
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Vulnerability Title
buffer overruns in libfsimage iso9660 handling
Source: CVE Program / CVE List V5
Vulnerability Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver derives several lengths directly from attacker-controlled on-disk fields without validating them: * The directory loop itself assumes a good record length. This is CVE-2026-42494. * The calculation of the System Use area may underflow. This is CVE-2026-42495. * The Rock Ridge extension loop assumes a good (inner) record length. This is CVE-2026-62423. * The Rock Ridge NM record processing assumes a good entry length. This is CVE-2026-62424. * The Rock Ridge CE record processing assumes a good size and offset. This is CVE-2026-62425.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是Xen组织开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上,并支持在运行时进行迁移,保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于libfsimage的iso9660驱动在目录和Rock Ridge/SUSP遍历时从攻击者控制的磁盘字段直接获取多个长度而未验证，可能导致缓冲区溢出，使用pygrub的客户机可提升权限至主机控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-497 -

II. Public POCs for CVE-2026-42494

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-42494

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Vendor Advisories for CVE-2026-42494 (1)

Same Patch Batch · Xen · 2026-07-28 · 18 CVEs total

CVE-2026-62425 buffer overruns in libfsimage iso9660 handling
CVE-2026-62430 x86: Out-of-bounds read in vRTC emulation
CVE-2026-62432 evtchn: Race between FIFO expand and reset
CVE-2026-62429 vNUMA domain cleanup may race other operations
CVE-2026-62433 correct buffer checks for DM_OP hypercalls
CVE-2026-62428 grant-table: type confusion in grant-copy
CVE-2026-62431 Viridian STIMER division by zero
CVE-2026-62424 buffer overruns in libfsimage iso9660 handling
CVE-2026-62423 buffer overruns in libfsimage iso9660 handling
CVE-2026-42495 buffer overruns in libfsimage iso9660 handling
CVE-2026-62434 PoD: Don't try to reclaim special pages
CVE-2026-62426 sysctl and platform-op locks open to abuse
CVE-2026-62436 grant-table: version change racing with other operations
CVE-2026-62427 sysctl and platform-op locks open to abuse
CVE-2026-62435 grant-table: version change racing with other operations
CVE-2026-42492 vIRQ event channel binding may break Xenstore
CVE-2026-42493 x86 shadow paging is deprecated

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-42494

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