{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2020-8834 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2020-8834 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 9 Apr 2020. 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-2020-8834 and fix it if it is affected.\n\nWhat it is: CVE-2020-8834 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 9 Apr 2020. 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-2020-8834 in the wild and no public exploit code.\n\nAffected product: Canonical Ubuntu 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-2020-8834/ (Markdown: https://insights.sbomify.com/CVE-2020-8834/index.md)","id":"CVE-2020-8834","markdown":"https://insights.sbomify.com/CVE-2020-8834/index.md","name":"CVE-2020-8834","record":{"aliases":["DEBIAN-CVE-2020-8834","GHSA-7fx7-755p-qmjj","UBUNTU-CVE-2020-8834"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel KVM","requires_auth":"low_privilege","summary":"A guest VM attacker can trigger a host kernel panic via a race condition in KVM Power8 transactional memory state handling.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"canonical","cpe":[{"product":"ubuntu_linux","vendor":"canonical"},{"product":"linux_kernel","vendor":"linux"},{"product":"leap","vendor":"opensuse"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-362","name":"Concurrent Execution using Shared Resource with Improper Synchronization"},{"id":"CWE-368","name":"Context Switching Race Condition"}],"description":"KVM in the Linux kernel on Power8 processors has a conflicting use of HSTATE_HOST_R1 to store r1 state in kvmppc_hv_entry plus in kvmppc_{save,restore}_tm, leading to a stack corruption. Because of this, an attacker with the ability run code in kernel space of a guest VM can cause the host kernel to panic. There were two commits that, according to the reporter, introduced the vulnerability: f024ee098476 (\"KVM: PPC: Book3S HV: Pull out TM state save/restore into separate procedures\") 87a11bb6a7f7 (\"KVM: PPC: Book3S HV: Work around XER[SO] bug in fake suspend mode\") The former landed in 4.8, the latter in 4.17. This was fixed without realizing the impact in 4.18 with the following three commits, though it's believed the first is the only strictly necessary commit: 6f597c6b63b6 (\"KVM: PPC: Book3S PR: Add guest MSR parameter for kvmppc_save_tm()/kvmppc_restore_tm()\") 7b0e827c6970 (\"KVM: PPC: Book3S HV: Factor fake-suspend handling out of kvmppc_save/restore_tm\") 009c872a8bc4 (\"KVM: PPC: Book3S PR: Move kvmppc_save_tm/kvmppc_restore_tm to separate file\")","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":"Linux kernel KVM Power8 conflicting use of HSTATE_HOST_R1","id":"CVE-2020-8834","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","linux:linux_kernel","opensuse:leap"],"type":"race_condition","year":"2020"},"n_packages":0,"n_references":5,"next":{"headline":"Linux kernel bpf verifier vulnerability","id":"CVE-2020-8835"},"packages":[],"prev":{"headline":"Apport race condition in crash report permissions","id":"CVE-2020-8833"},"products":["Linux kernel"],"published":"2020-04-09","related":[{"cvss_score":9.8,"headline":"SaltStack Salt Authentication Bypass","id":"CVE-2020-11651","kev_date_added":"2021-11-03","published":"2020-04-30"},{"cvss_score":9.8,"headline":"OpenSMTPD Remote Code Execution","id":"CVE-2020-7247","kev_date_added":"2022-03-25","published":"2020-01-29"},{"cvss_score":9.8,"headline":"Exim Out-of-bounds Write","id":"CVE-2019-16928","kev_date_added":"2022-03-03","published":"2019-09-27"},{"cvss_score":9.8,"headline":"Exim Buffer Overflow","id":"CVE-2018-6789","kev_date_added":"2021-11-03","published":"2018-02-08"},{"cvss_score":9.8,"headline":"Oracle Java SE and Java SE Embedded Remote Code Execution","id":"CVE-2015-2590","kev_date_added":"2022-03-03","published":"2015-07-16"},{"cvss_score":9.8,"headline":"Oracle JRE Remote Code Execution","id":"CVE-2013-0422","kev_date_added":"2022-05-25","published":"2013-01-10"},{"cvss_score":9.8,"headline":"Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution","id":"CVE-2011-3544","kev_date_added":"2022-03-03","published":"2011-10-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-16","vendors":["Linux kernel"]},"summary":"A guest VM attacker can trigger a host kernel panic via a race condition in KVM Power8 transactional memory state handling.","url":"https://insights.sbomify.com/CVE-2020-8834/"}