{"id":"CVE-2026-31628","title":"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","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":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.16.58, < 3.17","linux_kernel >= 4.4.144, < 4.5","linux_kernel >= 4.9.102, < 4.10","linux_kernel >= 4.14.1, < 5.10.253","linux_kernel >= 5.11, < 5.15.203","linux_kernel >= 5.16, < 6.1.169","linux_kernel >= 6.2, < 6.6.135","linux_kernel >= 6.7, < 6.12.82","linux_kernel >= 6.13, < 6.18.23","linux_kernel >= 6.19, < 6.19.13","linux_kernel >= 7.0, < 7.0.1","linux_kernel = 4.14"],"patched":["linux_kernel 7.0.1"],"published":"2026-04-24","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:19:13.707","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31628","references":[{"url":"https://git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00129,"epssPercentile":0.02497,"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_kernel >= 3.16.58, < 3.17`\n- `linux_kernel >= 4.4.144, < 4.5`\n- `linux_kernel >= 4.9.102, < 4.10`\n- `linux_kernel >= 4.14.1, < 5.10.253`\n- `linux_kernel >= 5.11, < 5.15.203`\n- `linux_kernel >= 5.16, < 6.1.169`\n- `linux_kernel >= 6.2, < 6.6.135`\n- `linux_kernel >= 6.7, < 6.12.82`\n- `linux_kernel >= 6.13, < 6.18.23`\n- `linux_kernel >= 6.19, < 6.19.13`\n- `linux_kernel >= 7.0, < 7.0.1`\n- `linux_kernel = 4.14`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.1`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":221733,"id":"CVE-2026-31628","ts":1792035344275,"field":"cvss","old":null,"new":"5.5"},{"seq":221732,"id":"CVE-2026-31628","ts":1792035344275,"field":"severity","old":"none","new":"medium"}]}