{"id":"CVE-2021-26318","aliases":["EUVD-2021-13124","GHSA-8rf7-vpj6-3967","UBUNTU-CVE-2021-26318","openSUSE-SU-2026:11242-1"],"status":"published","title":"Side-channels Related to the x86 PREFETCH Instruction","description":"A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.","severity":{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00327,"percentile":0.26002,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-203","CWE-208"],"published":"2021-10-13T18:29:14Z","modified":"2026-07-10T10:00:10Z","affected":[{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"spectre-meltdown-checker","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.36.0602723-1.1"}]}],"bundled":28}],"products":[{"vendor":"amd","product":"all supported processors"},{"vendor":"amd","product":"athlon_firmware"},{"vendor":"amd","product":"athlon_pro_firmware"},{"vendor":"amd","product":"epyc_firmware"},{"vendor":"amd","product":"ryzen_firmware"},{"vendor":"amd","product":"ryzen_pro_firmware"}],"references":[{"url":"https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1017","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26318"},{"url":"https://github.com/advisories/GHSA-8rf7-vpj6-3967"},{"url":"https://ubuntu.com/security/CVE-2021-26318","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-26318","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2017-5715","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-5753","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-3615","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-3620","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-3640","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-11157","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-0543","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-12965","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8694","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-26318","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-21123","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-29900","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2022-29901","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-20569","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-20588","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-23583","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-28746","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-31315","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-28956","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-36350","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-45332","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-56161","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-7881","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-20623","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-24495","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-29943","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-40300","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-54505","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2021-26318","title":"Side-channels Related to the x86 PREFETCH Instruction","description":"A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.","status":"published","published":"2021-10-13T18:29:14.977Z","modified":"2024-09-16T16:48:55.696Z","cwes":["CWE-208"],"updated_at":"2026-11-02T14:32:57.033395Z"}],"euvd":[{"id":"EUVD-2021-13124","description":"A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.","status":"published","published":"2021-10-13T18:29:14Z","modified":"2024-09-16T16:48:55Z","updated_at":"2026-11-03T00:55:47.716817Z"}],"ghsa":[{"id":"GHSA-8rf7-vpj6-3967","title":"A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD...","description":"A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.","status":"published","published":"2022-05-24T19:17:23Z","modified":"2023-01-30T05:02:48Z","cwes":["CWE-203"],"updated_at":"2026-11-02T14:46:43.162136Z"}],"nvd":[{"id":"CVE-2021-26318","description":"A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.","status":"published","published":"2021-10-13T19:15:07.36Z","modified":"2026-06-17T03:43:06.57Z","cvss":[{"version":"3.1","score":4.7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":1.9,"vector":"AV:L/AC:M/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-208","CWE-203"],"updated_at":"2026-11-02T14:06:59.689345Z"}],"osv":[{"id":"UBUNTU-CVE-2021-26318","description":"A timing and power-based side channel attack leveraging the x86 PREFETCH instructions 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