{"id":"CVE-2026-31628","title":"x86/CPU: Fix FPDSS on Zen1","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU: Fix FPDSS on Zen1\n\nZen1's hardware divider can leave, under certain circumstances, partial\nresults from previous operations.  Those results can be leaked by\nan…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < ed7a3a246309ccc807238f1b4f159ee6d37ff9c4","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 0548529af20e68c6552817834b766646dd3bd7a7","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 1272cfedf4cd1019ddf583917a99b62f2d3645bb","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 91f02726b2203b71545713ecb7fb006e60a2d66f","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < b731aca06387b195058a9f6449a03b62efa1bd10","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < ad17f07e95e6e8505e2153e5b391f0d27eacce25","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < e6af5286efe5a56128b34032572c9ce9ebeccda3","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 546785c719418c6166834a47e372a88f5f7ae893","Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < e55d98e7756135f32150b9b8f75d580d0d4b2dd3","Linux 5abd1583e06b3963e5c9d915760367de86808b78","Linux 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686","Linux 5a63725cd18fcee2af6ec46ccb856b64ad3077b4","Linux >= 3.16.58 < 3.17","Linux >= 4.4.144 < 4.5","Linux >= 4.9.102 < 4.10","Linux 4.14"],"published":"2026-04-24","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:47:48.248Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31628","references":[{"url":"https://git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4"},{"url":"https://git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7"},{"url":"https://git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb"},{"url":"https://git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f"},{"url":"https://git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10"},{"url":"https://git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25"},{"url":"https://git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3"},{"url":"https://git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893"},{"url":"https://git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3"}],"tags":["cve.org"],"epss":0.00171,"epssPercentile":0.05626,"ingestedAt":"2026-09-08T15:33:26.990Z","slug":"CVE-2026-31628","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU: Fix FPDSS on Zen1\n\nZen1's hardware divider can leave, under certain circumstances, partial\nresults from previous operations.  Those results can be leaked by\nanother, attacker thread.\n\nFix that with a chicken bit.\n\n## Affected\n\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < ed7a3a246309ccc807238f1b4f159ee6d37ff9c4`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 0548529af20e68c6552817834b766646dd3bd7a7`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 1272cfedf4cd1019ddf583917a99b62f2d3645bb`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 91f02726b2203b71545713ecb7fb006e60a2d66f`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < b731aca06387b195058a9f6449a03b62efa1bd10`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < ad17f07e95e6e8505e2153e5b391f0d27eacce25`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < e6af5286efe5a56128b34032572c9ce9ebeccda3`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < 546785c719418c6166834a47e372a88f5f7ae893`\n- `Linux >= f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 < e55d98e7756135f32150b9b8f75d580d0d4b2dd3`\n- `Linux 5abd1583e06b3963e5c9d915760367de86808b78`\n- `Linux 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686`\n- `Linux 5a63725cd18fcee2af6ec46ccb856b64ad3077b4`\n- `Linux >= 3.16.58 < 3.17`\n- `Linux >= 4.4.144 < 4.5`\n- `Linux >= 4.9.102 < 4.10`\n- `Linux 4.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}