Medium 5.5Published Apr 24, 2026

CVE-2026-31628x86/CPU: Fix FPDSS on Zen1

Updated under an hour ago (Oct 28, 2026, 4:30 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: x86/CPU: Fix FPDSS on Zen1 Zen1's hardware divider can leave, under certain circumstances, partial results from previous operations. Those results can be leaked by another, attacker thread. Fix that with a chicken bit.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before ed7a3a246309ccc807238f1b4f159ee6d37ff9c4; from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before 0548529af20e68c6552817834b766646dd3bd7a7; from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before 1272cfedf4cd1019ddf583917a99b62f2d3645bb; from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before 91f02726b2203b71545713ecb7fb006e60a2d66f; from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before b731aca06387b195058a9f6449a03b62efa1bd10; from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before ad17f07e95e6e8505e2153e5b391f0d27eacce25; from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before e6af5286efe5a56128b34032572c9ce9ebeccda3; from f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 before 546785c719418c6166834a47e372a88f5f7ae893; and 7 more ranges	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 3.16.58 before 3.17; from 4.4.144 before 4.5; from 4.9.102 before 4.10; from 4.14.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.169; from 6.2 before 6.6.135; from 6.7 before 6.12.82; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4	patch
https://git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7	patch
https://git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb	patch
https://git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f	patch
https://git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10	patch
https://git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25	patch
https://git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3	patch
https://git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893	patch
https://git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.