{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-43483 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-43483 is a medium-severity denial of service vulnerability in Linux kernel, published on 13 May 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-2026-43483 and fix it if it is affected.\n\nWhat it is: CVE-2026-43483 is a medium-severity denial of service vulnerability in Linux kernel, published on 13 May 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-2026-43483 in the wild and no public exploit code.\n\nAffected product: Linux kernel. 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-2026-43483/ (Markdown: https://insights.sbomify.com/CVE-2026-43483/index.md)","id":"CVE-2026-43483","markdown":"https://insights.sbomify.com/CVE-2026-43483/index.md","name":"CVE-2026-43483","record":{"aliases":["BELL-CVE-2026-43483","DEBIAN-CVE-2026-43483","GHSA-8rg3-3364-c6fh","ROOT-OS-DEBIAN-11-CVE-2026-43483","ROOT-OS-UBUNTU-2204-CVE-2026-43483","ROOT-OS-UBUNTU-2404-CVE-2026-43483","UBUNTU-CVE-2026-43483"],"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 flaw in Linux KVM SVM implementation causes Windows guests to crash due to TPR synchronization issues when AVIC is activated.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated\n\nExplicitly set/clear CR8 write interception when AVIC is (de)activated to\nfix a bug where KVM leaves the interception enabled after AVIC is\nactivated.  E.g. if KVM emulates INIT=\u003eWFS while AVIC is deactivated, CR8\nwill remain intercepted in perpetuity.\n\nOn its own, the dangling CR8 intercept is \"just\" a performance issue, but\ncombined with the TPR sync bug fixed by commit d02e48830e3f (\"KVM: SVM:\nSync TPR from LAPIC into VMCB::V_TPR even if AVIC is active\"), the danging\nintercept is fatal to Windows guests as the TPR seen by hardware gets\nwildly out of sync with reality.\n\nNote, VMX isn't affected by the bug as TPR_THRESHOLD is explicitly ignored\nwhen Virtual Interrupt Delivery is enabled, i.e. when APICv is active in\nKVM's world.  I.e. there's no need to trigger update_cr8_intercept(), this\nis firmly an SVM implementation flaw/detail.\n\nWARN if KVM gets a CR8 write #VMEXIT while AVIC is active, as KVM should\nnever enter the guest with AVIC enabled and CR8 writes intercepted.\n\n[Squash fix to avic_deactivate_vmcb. - Paolo]","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":"KVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated","id":"CVE-2026-43483","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"mmc: core: Avoid bitfield RMW for claim/retune flags","id":"CVE-2026-43484"},"packages":[],"prev":{"headline":"sched_ext: Disable preemption between scx_claim_exit() and kicking helper work","id":"CVE-2026-43482"},"products":["Linux"],"published":"2026-05-13","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-05-13","vendors":["Linux"]},"summary":"A flaw in Linux KVM SVM implementation causes Windows guests to crash due to TPR synchronization issues when AVIC is activated.","url":"https://insights.sbomify.com/CVE-2026-43483/"}