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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
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 gvfs 的 MTP 后端中发现了缺陷。当从已挂载的 MTP 设备读取文件时， 中的 函数直接信任设备返回的数据长度，未将其限制为客户端最初请求的大小。如果恶意的 MTP 设备返回的字节数超过请求的量，这个未受限制的长度会被直接传递给 。这会导致该操作读取预期边界之外的内存。因此，插入恶意 MTP 设备的攻击者可以在读取文件时导致 进程发生段错误（segmentation fault）并崩溃，从而造成服务拒绝（DoS）。

CVSS 4.3 · Medium
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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

Affected Products

Vendor Product Affected Versions CPE Subscribe
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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Other References for CVE-2026-84270 (3)

Same Patch Batch · Red Hat · 2026-09-01 · 10 CVEs total

CVE-2026-84268 8.8 HIGH Gvfs: sftp: heap-based buffer overflow in read_reply()
CVE-2026-84218 8.1 HIGH Org.jolokia/jolokia-core: incomplete jndi denylist in jolokia jsr-160 proxy (bypass of cve
CVE-2026-49329 7.5 HIGH Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language hea
CVE-2026-84233 7.0 HIGH Rpm: command execution via macro expansion in `rpmuncompress -x` for crafted `.gem` filena
CVE-2026-84269 6.5 MEDIUM Gvfs: afp: heap-based buffer overflow in dsi read path
CVE-2026-11873 6.5 MEDIUM Pki-core: dogtag-pki: empty request to dogtag /ca/rest/certrequests causes http 500, java
CVE-2026-84232 5.4 MEDIUM Pulpcore: python-pulpcore: stored cross-site scripting via inline rendering of uploaded ht
CVE-2026-53682 5.3 MEDIUM Pki-core: dogtag-pki: unauthenticated dogtag ca rest api exposes security domain hosts
CVE-2026-84267 4.3 MEDIUM Gvfs: sftp: uninitialized heap disclosure in read_string()

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-84270

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