Home/CVE/In the Linux kernel, the following vulnerability has been resolved: x86/CPU: Fix FPDSS on Zen1 Zen1's hardware divider
CVE

CVE-2026-31628

In the Linux kernel, the following vulnerability has been resolved: x86/CPU: Fix FPDSS on Zen1 Zen1's hardware divider

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.

MEDIUM · CVSS 5.5 EPSS 0.00023
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
Look this up elsewhere - one-click external pivots
NVDCVE.orgCISAVulnersExploit-DBGitHub PoCVulnCheck KEVGreyNoise
▸ How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2026-31628, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked. EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal. CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score. Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits. PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
◆

ATT&CK techniques

1

Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.

T1068 · Exploitation for Privilege Escalation
▤ Build a SIEM detection for these techniques
▤

Affected Products & Versions

12
linux kernel>= 3.16.58 and < 3.17
linux kernel>= 4.4.144 and < 4.5
linux kernel>= 4.9.102 and < 4.10
linux kernel>= 4.14.1 and < 5.10.253
linux kernel>= 5.11 and < 5.15.203
linux kernel>= 5.16 and < 6.1.169
linux kernel>= 6.2 and < 6.6.135
linux kernel>= 6.7 and < 6.12.82
📦

Fixed versions by distribution

51
The package version that resolves this CVE on each Linux distribution, from the vendor’s published security data. fixed in shows a patched version exists; open means the package is listed as affected with no fix yet.
oracle allbpftool fixed in 0:5.15.0-320.202.8.2.el8uek
oracle allkernel-uek open
oracle allkernel-uek-container fixed in 0:5.15.0-320.202.8.2.el8uek
oracle allkernel-uek-container-debug fixed in 0:5.15.0-320.202.8.2.el9uek
oracle allkernel-uek-core fixed in 0:5.15.0-320.202.8.2.el8uek
oracle allkernel-uek-debug fixed in 0:5.15.0-320.202.8.2.el9uek
oracle allkernel-uek-debug-core open
oracle allkernel-uek-debug-devel fixed in 0:5.15.0-320.202.8.2.el8uek
oracle allkernel-uek-debug-modules open
oracle allkernel-uek-debug-modules-core fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek-debug-modules-deprecated fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-debug-modules-desktop open
oracle allkernel-uek-debug-modules-extra fixed in 0:5.15.0-320.202.8.2.el9uek
oracle allkernel-uek-debug-modules-extra-netfilter open
oracle allkernel-uek-debug-modules-usb fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek-debug-modules-wireless fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-devel fixed in 0:5.15.0-320.202.8.2.el8uek
oracle allkernel-uek-modules fixed in 0:5.15.0-320.202.8.2.el8uek
oracle allkernel-uek-modules-core open
oracle allkernel-uek-modules-deprecated open
oracle allkernel-uek-modules-desktop fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-modules-extra open
oracle allkernel-uek-modules-extra-netfilter open
oracle allkernel-uek-modules-usb fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek-modules-wireless fixed in 0:6.12.0-203.76.7.1.el10uek
oracle allkernel-uek-tools open
oracle allkernel-uek64k open
oracle allkernel-uek64k-core fixed in 0:5.15.0-320.202.8.2.el9uek
oracle allkernel-uek64k-devel fixed in 0:5.15.0-320.202.8.2.el9uek
oracle allkernel-uek64k-modules open
oracle allkernel-uek64k-modules-core fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek64k-modules-deprecated open
oracle allkernel-uek64k-modules-desktop open
oracle allkernel-uek64k-modules-extra fixed in 0:5.15.0-320.202.8.2.el9uek
oracle allkernel-uek64k-modules-extra-netfilter open
oracle allkernel-uek64k-modules-usb fixed in 0:6.12.0-203.76.7.1.el9uek
oracle allkernel-uek64k-modules-wireless fixed in 0:6.12.0-203.76.7.1.el10uek
suse sle15cluster-md-kmp-default open
suse sle15dlm-kmp-default open
suse sle15gfs2-kmp-default open
suse sle15kernel-default open
suse sle15kernel-default-base open
suse sle15kernel-default-devel open
suse sle15kernel-default-livepatch open
suse sle15kernel-default-livepatch-devel open
suse sle15kernel-default-man open
suse sle15kernel-devel open
suse sle15kernel-macros open
suse sle15kernel-source open
suse sle15ocfs2-kmp-default open
suse sle15reiserfs-kmp-default open
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD24 Apr 2026 · 03:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

2
suse-csafopenSUSE-SU-2026:10703-1
msrcCVE-2026-31628
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7Patch
https://git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bbPatch
https://git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893Patch
https://git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66fPatch
https://git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25Patch
https://git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10Patch
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