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

Status: published. Published: 2026-09-01. Updated: 2026-11-06.

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.

## Remediation

- workaround: To mitigate this vulnerability, do not connect untrusted or unknown MTP devices to the system. (source: CNA: redhat)

## Affected products and versions

- GNOME / gvfs (gvfs): ≥ 0; < 1.60.2 (affected, semver). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (gvfs): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (gvfs): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (gvfs): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (gvfs): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (gvfs): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-05; percentile 4.20%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-84270 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2526794 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.gnome.org/GNOME/gvfs/-/issues/864 (CNA: redhat)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-84270; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-84270; retrieved 2026-11-06; source updated Not reported

Revision: 8847bf765dc60be812a5f1e6976b7711941680819b4d69bf701cd59afb9651db

Canonical: https://y2.dev/cve/CVE-2026-84270

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.