{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-89621 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-89621 is a vulnerability in Linux, published on 11 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."},"fix_prompt":"Check this codebase for CVE-2026-89621 and fix it if it is affected.\n\nWhat it is: CVE-2026-89621 is a vulnerability in Linux, published on 11 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.\nExploitation: There is no known exploitation of CVE-2026-89621 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-89621/ (Markdown: https://insights.sbomify.com/CVE-2026-89621/index.md)","id":"CVE-2026-89621","markdown":"https://insights.sbomify.com/CVE-2026-89621/index.md","name":"CVE-2026-89621","record":{"aliases":["AZL-100644","BELL-CVE-2026-89621","DEBIAN-CVE-2026-89621","GHSA-55hm-qvfp-55mj","UBUNTU-CVE-2026-89621"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_read"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel driver","requires_auth":"none","summary":"A malicious USB device can trigger a buffer over-read in the MCP2221 HID driver, leaking uninitialized kernel memory to userspace.","user_interaction":"required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nHID: mcp2221: validate report size in mcp2221_raw_event()\n\nmcp2221_raw_event() never validates the size of incoming HID reports.\nIn the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3]\nas the copy length without checking that 4 + data[3] bytes actually\nexist in the received report. A malicious or misbehaving USB device can\nsend a short report with a large data[3], causing the memcpy to read\npast the valid report data in the HID transfer buffer and leak\nuninitialized kernel memory back to userspace through the I2C/SMBus\nread path.\n\nAdd a minimum size check at entry and validate that the source range\nfits within the received report before the copy.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"HID: mcp2221: validate report size in mcp2221_raw_event()","id":"CVE-2026-89621","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"information_disclosure","year":"2026"},"n_packages":0,"n_references":8,"next":{"headline":"HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes","id":"CVE-2026-89622"},"packages":[],"prev":{"headline":"HID: intel-thc-hid: intel-quickspi: validate report size before copy","id":"CVE-2026-89620"},"products":["Linux"],"published":"2026-09-11","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A malicious USB device can trigger a buffer over-read in the MCP2221 HID driver, leaking uninitialized kernel memory to userspace.","url":"https://insights.sbomify.com/CVE-2026-89621/"}