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CVE-2026-84270— Gvfs: mtp: out-of-bounds read in do_read()

Quick assessment

Affected
GNOME gvfs
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.

GNOME GVfs是GNOME基金会开源的一个虚拟文件系统。 GNOME GVfs存在缓冲区错误漏洞，该漏洞源于MTP后端中do_read()函数信任设备返回的数据长度，未限制为客户端请求的原始大小，导致读取越界内存，可能允许插入恶意MTP设备的攻击者在读取文件时引发段错误并崩溃gvfsd-mtp进程，造成拒绝服务。

CVSS 4.3 · Medium EPSS 0.22% · P12

Affected Version Matrix 6

VendorProduct Version RangeStatus
GNOME gvfs < 1.60.2 affected
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-84270

Vulnerability Information
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Vulnerability Title
Gvfs: mtp: out-of-bounds read in do_read()
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the MTP backend in gvfs. When reading a file from a mounted MTP device, do_read() in gvfsbackendmtp.c trusts the data length returned by the device without limiting it to the original size requested by the client. If a malicious MTP device responds with more bytes than requested, this unrestricted length is passed directly to memcpy(). This causes the operation to read memory outside the intended boundaries. This allows an attacker who plugs in a malicious MTP device to cause a segmentation fault when a file is read and crash the gvfsd-mtp process, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/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
Vulnerability Title
GNOME GVfs 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNOME GVfs是GNOME基金会开源的一个虚拟文件系统。 GNOME GVfs存在缓冲区错误漏洞，该漏洞源于MTP后端中do_read()函数信任设备返回的数据长度，未限制为客户端请求的原始大小，导致读取越界内存，可能允许插入恶意MTP设备的攻击者在读取文件时引发段错误并崩溃gvfsd-mtp进程，造成拒绝服务。
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
GNOME gvfs 0 ~ 1.60.2 -
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-84270

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III. Intelligence Information for CVE-2026-84270

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Vendor Advisories for CVE-2026-84270 (1)

Other References for CVE-2026-84270 (1)

Same Patch Batch · GNOME · 2026-09-01 · 4 CVEs total

CVE-2026-84268 8.8 HIGH Gvfs: sftp: heap-based buffer overflow in read_reply()
CVE-2026-84269 6.5 MEDIUM Gvfs: afp: heap-based buffer overflow in dsi read path
CVE-2026-84267 4.3 MEDIUM Gvfs: sftp: uninitialized heap disclosure in read_string()

IV. Related Vulnerabilities

Same product: gvfs
Same vendor: GNOME
Same weakness: CWE-125

V. Comments for CVE-2026-84270

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