CVE-2026-84270 Gvfs: mtp: out-of-bounds read in do_read()
A malicious MTP device can trigger an out-of-bounds read in gvfs, causing a segmentation fault and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-84270?
CVE-2026-84270 is a medium-severity memory corruption vulnerability in GNOME Red Hat Enterprise Linux 10, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-84270?
How do I fix CVE-2026-84270?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-84270 being exploited?
There is no known exploitation of CVE-2026-84270 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-84270, GHSA-2rh6-86rx-p849, UBUNTU-CVE-2026-84270.