VulnerabilityPublished 24 Apr 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in ed7a3a246309ccc807238f1b4f159ee6d37ff9c4, e55d98e7756135f32150b9b8f75d580d0d4b2dd3, e6af5286efe5a56128b34032572c9ce9ebeccda3 +9

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected >=3.16.58 <3.17 >=4.4.144 <4.5 >=4.9.102 <4.10	Fixed in ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 e55d98e7756135f32150b9b8f75d580d0d4b2dd3 e6af5286efe5a56128b34032572c9ce9ebeccda3 b731aca06387b195058a9f6449a03b62efa1bd10 ad17f07e95e6e8505e2153e5b391f0d27eacce25 0548529af20e68c6552817834b766646dd3bd7a7 546785c719418c6166834a47e372a88f5f7ae893 1272cfedf4cd1019ddf583917a99b62f2d3645bb 91f02726b2203b71545713ecb7fb006e60a2d66f 4.10 4.5 3.17
LinuxLinux	Affected =4.14	Fixed in–

Description

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.

References

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