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CVE-2026-45252— Heap overflow in FUSE_LISTXATTR

Quick assessment

Affected
FreeBSD FreeBSD
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.

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于在处理扩展属性时，内核模块未验证守护进程返回的列表是否以NUL结尾，可能导致越界读取堆分配缓冲区并越界写入第二个缓冲区，恶意守护进程可泄露最多253字节内核堆内存或注入最多250字节攻击者控制的数据到未分配内核堆空间。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.28% · P20

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p9 affected
14.4-RELEASE< p5 affected
14.3-RELEASE< p14 affected
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I. Basic Information for CVE-2026-45252

Vulnerability Information
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Vulnerability Title
Heap overflow in FUSE_LISTXATTR
Source: CVE Program / CVE List V5
Vulnerability Description
When a fusefs file system implements extended attributes, the kernel may send a FUSE_LISTXATTR message to the userspace daemon to retrieve the list of extended attributes for a given file. The FUSE protocol requires the daemon to return a packed list of NUL-terminated strings. The fusefs kernel module calls strlen() on this daemon-supplied buffer without first verifying that the entire list is NUL-terminated. If a malicious daemon sends a non-NUL-terminated list, the fusefs kernel module may read beyond the end of one heap-allocated buffer and potentially write beyond the end of a second buffer. A malicious daemon could disclose up to 253 bytes of kernel heap memory, or it could inject up to 250 attacker-controlled bytes into unallocated kernel heap space.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于在处理扩展属性时，内核模块未验证守护进程返回的列表是否以NUL结尾，可能导致越界读取堆分配缓冲区并越界写入第二个缓冲区，恶意守护进程可泄露最多253字节内核堆内存或注入最多250字节攻击者控制的数据到未分配内核堆空间。
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
FreeBSD FreeBSD 15.0-RELEASE ~ p9 -

II. Public POCs for CVE-2026-45252

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III. Intelligence Information for CVE-2026-45252

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Vendor Advisories for CVE-2026-45252 (1)

Same Patch Batch · FreeBSD · 2026-05-21 · 7 CVEs total

CVE-2026-45250 Stack buffer overflow via setcred(2)
CVE-2026-45255 Remote code execution via installer Wi-Fi access point scans
CVE-2026-45251 Kernel use-after-free via file descriptor syscalls
CVE-2026-45253 Missing validation in ptrace(PT_SC_REMOTE)
CVE-2026-45254 Incorrect libcap_net limitation list manipulation
CVE-2026-39461 select(2) file descriptor set overflow causes stack overflow

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-122

V. Comments for CVE-2026-45252

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