Medium [CVE-2026-84270] Gvfs: mtp: out-of-bounds read in do_read

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. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.

Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat does not currently list a fixing RHSA for this CVE.

Affected products named by the advisory: Red Hat package: gvfs-client; Red Hat package: gvfs-fuse; Red Hat package: gvfs-goa; Red Hat package: gvfs-gphoto2; and 9 more.

Affected products named by the advisory: Red Hat package: gvfs-mtp; Red Hat package: gvfs-smb; Red Hat package: gvfs.src; Red Hat package: gvfs-afc; and 5 more.