{"id":"CVE-2026-98464","title":"kernel: RISC-V: KVM: Synchronize hrtimer callback during teardown (CVE-2026-98464)","summary":"A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) implementation for the RISC-V architecture. This vulnerability can lead to a Denial of Service (DoS) or host system crash due to a use-after-free memory issue during…","severity":"medium","cvss":5.6,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-825","vendor":"Red Hat","product":"Linux","affected":["Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 < 9bdbae64ae0dab93041ebc57ec4e93def793fc2d","Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 < 2af03b606aadaaeb386658ef798c79bdcdef87c1","Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 < e66aced74f0122380603c9910a71d77618b28f0e","Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 < ea91f05a55b807ead3166546a2c75f4185ca645f","Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 < 3cc6184bd5920c9685d87f4e260568feba08650d","Linux >= 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 < aaad136d56d91252517272b68cd533e5714698d5","Linux 5.16"],"published":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:27:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98464.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98464.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98464"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554828"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98464"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98464"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98464.mbox"},{"url":"https://git.kernel.org/stable/c/9bdbae64ae0dab93041ebc57ec4e93def793fc2d"},{"url":"https://git.kernel.org/stable/c/2af03b606aadaaeb386658ef798c79bdcdef87c1"},{"url":"https://git.kernel.org/stable/c/e66aced74f0122380603c9910a71d77618b28f0e"},{"url":"https://git.kernel.org/stable/c/ea91f05a55b807ead3166546a2c75f4185ca645f"},{"url":"https://git.kernel.org/stable/c/3cc6184bd5920c9685d87f4e260568feba08650d"},{"url":"https://git.kernel.org/stable/c/aaad136d56d91252517272b68cd533e5714698d5"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"epss":0.00143,"epssPercentile":0.03573,"scores":{"vendor":5.6,"cna":9.3},"ingestedAt":"2026-10-18T15:45:12.300Z","slug":"CVE-2026-98464","body":"## Overview\n\nA flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) implementation for the RISC-V architecture. This vulnerability can lead to a Denial of Service (DoS) or host system crash due to a use-after-free memory issue during virtual machine teardown. A race condition allows a timer callback to continue executing after its associated virtual central processing unit (vCPU) has already been freed. A malicious user within a guest virtual machine can exploit this by scheduling a timer and immediately requesting a system shutdown.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98464.json)\n\n**kernel: RISC-V: KVM: Synchronize hrtimer callback during teardown** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"sunlit","depthScore":31,"depthScoreParts":{"impact":30.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":229508,"id":"CVE-2026-98464","ts":1793019825350,"field":"cvss","old":"9.3","new":"5.6"},{"seq":229507,"id":"CVE-2026-98464","ts":1793019825350,"field":"severity","old":"critical","new":"medium"},{"seq":228968,"id":"CVE-2026-98464","ts":1792854124503,"field":"cvss","old":null,"new":"9.3"},{"seq":228967,"id":"CVE-2026-98464","ts":1792854124503,"field":"severity","old":"none","new":"critical"}]}