CVE-2026-31628
x86/CPU: Fix FPDSS on Zen1
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.
INFO
Published Date :
April 24, 2026, 3:16 p.m.
Last Modified :
April 27, 2026, 8:40 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to the latest version.
- Apply the provided patch for Zen1 processors.
- Ensure the fix is verified in your environment.
Public PoC/Exploit Available at Github
CVE-2026-31628 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-31628.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31628 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31628
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
DSA and DLA for Debian last 14 days
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31628 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-31628 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.16.58 up to (excluding) 3.17 *cpe:2.3:o:linux:linux_kernel:4.14:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.203 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.169 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.14.1 up to (excluding) 5.10.253 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 7.0 up to (excluding) 7.0.1 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.23 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.13 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.4.144 up to (excluding) 4.5 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.9.102 up to (excluding) 4.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.135 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.82 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 27, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3 -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 24, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7 Added Reference https://git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb Added Reference https://git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893 Added Reference https://git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f Added Reference https://git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25 Added Reference https://git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10 Added Reference https://git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3 Added Reference https://git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4