{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-97876 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-97876 is a medium-severity vulnerability in GNU grub2, published on 2 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-97876 and fix it if it is affected.\n\nWhat it is: CVE-2026-97876 is a medium-severity vulnerability in GNU grub2, published on 2 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-97876 in the wild and no public exploit code.\n\nAffected product: GNU grub2. 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-2026-97876/ (Markdown: https://insights.sbomify.com/CVE-2026-97876/index.md)","id":"CVE-2026-97876","markdown":"https://insights.sbomify.com/CVE-2026-97876/index.md","name":"CVE-2026-97876","record":{"aliases":["BELL-CVE-2026-97876","DEBIAN-CVE-2026-97876","GHSA-v555-hf4g-q6pc","UBUNTU-CVE-2026-97876"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"GRUB bootloader","requires_auth":"high_privilege","summary":"A local attacker can bypass Secure Boot lockdown restrictions in GRUB to load unsigned modules by exploiting insufficient MMIO address validation.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"canonical","cpe":[],"cvss":{"score":6.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-822","name":"Untrusted Pointer Dereference"}],"description":"A local attacker with control over GRUB's configuration can bypass lockdown restrictions when booting with Secure Boot and load an unsigned GRUB module, while GRUB continues to report lockdown is enabled.\n\nThe vulnerability is caused by insufficient validation of the MMIO base address passed to the GRUB serial command. GRUB does not validate that the base address corresponds to a UART device, rather than being an arbitrary memory address. This allows an attacker to trick GRUB into writing non-arbitrary data at an attacker-controlled address, including resetting the grub_file_verifiers list in a way that disables the subsequent verification of loaded modules.","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":"Bypass of GRUB lockdown restriction in Secure Boot mode via serial command MMIO base address","id":"CVE-2026-97876","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"zhistaredu StarTraining JWT Token application.yml UserLoginService.createToken hard-coded password","id":"CVE-2026-97877"},"packages":[],"prev":{"headline":"DNS rebinding vulnerability in rojo serve HTTP API","id":"CVE-2026-97875"},"products":["grub2"],"published":"2026-10-02","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-02","vendors":["GNU"]},"summary":"A local attacker can bypass Secure Boot lockdown restrictions in GRUB to load unsigned modules by exploiting insufficient MMIO address validation.","url":"https://insights.sbomify.com/CVE-2026-97876/"}