CVE-2026-31628: x86/CPU: Fix FPDSS on Zen1
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 0548529af20e68c6552817834b766646dd3bd7a7, 1272cfedf4cd1019ddf583917a99b62f2d3645bb, 3.17; azl3 kernel 6.6.134.1-2 on Azure Linux 3.0 6.6.137.1-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.
Low priority for now. Upgrade to Linux Linux 0548529af20e68c6552817834b766646dd3bd7a7, 1272cfedf4cd1019ddf583917a99b62f2d3645bb, 3.17; azl3 kernel 6.6.134.1-2 on Azure Linux 3.0 6.6.137.1-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Apr 24, 2026
- Updated
- Nov 11, 2026
- EPSS
- 0.1% · 2th percentile
- CWE
- —
Report tools
Action score
22
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 5abd1583e06b3963e5c9d915760367de86808b78, 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686, 5a63725cd18fcee2af6ec46ccb856b64ad3077b4, 4.14affected
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before ed7a3a246309ccc807238f1b4f159ee6d37ff9c4affected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before 0548529af20e68c6552817834b766646dd3bd7a7affected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before 1272cfedf4cd1019ddf583917a99b62f2d3645bbaffected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before 91f02726b2203b71545713ecb7fb006e60a2d66faffected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before b731aca06387b195058a9f6449a03b62efa1bd10affected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before ad17f07e95e6e8505e2153e5b391f0d27eacce25affected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before e6af5286efe5a56128b34032572c9ce9ebeccda3affected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before 546785c719418c6166834a47e372a88f5f7ae893affected · git
- f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9 and later · before e55d98e7756135f32150b9b8f75d580d0d4b2dd3affected · git
Affected versions · NVD (12)
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel3.16.58 and later · before 3.17
- linux linux kernel4.4.144 and later · before 4.5
- linux linux kernel4.9.102 and later · before 4.10
- linux linux kernel4.14.1 and later · before 5.10.253
- linux linux kernel5.11 and later · before 5.15.203
- linux linux kernel5.16 and later · before 6.1.169
- linux linux kernel6.2 and later · before 6.6.135
- linux linux kernel6.7 and later · before 6.12.82
- linux linux kernel6.13 and later · before 6.18.23
- linux linux kernel6.19 and later · before 6.19.13
- linux linux kernel7.0 and later · before 7.0.1
- linux linux kernel4.14
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.170-1 | 6.1.170-1 |
| Debian:13 | linux | before 6.12.85-1 | 6.12.85-1 |
| Debian:14 | linux | before 6.19.13-1 | 6.19.13-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.235.1 | 5.14.21-150400.24.235.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.235.1 | 5.14.21-150400.24.235.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.235.1 | 5.14.21-150400.24.235.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.235.1 | 5.14.21-150400.24.235.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.182.1 | 5.14.21-150500.55.182.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.182.1 | 5.14.21-150500.55.182.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.182.1 | 5.14.21-150500.55.182.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.182.1 | 5.14.21-150500.55.182.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kernel-default | before 4.12.14-122.323.1 | 4.12.14-122.323.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_86 | before 1-8.3.1 | 1-8.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_58 | before 1-150400.9.7.1 | 1-150400.9.7.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_44 | before 1-150500.11.5.1 | 1-150500.11.5.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.130.1 | 6.4.0-150600.23.130.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_30 | before 1-150600.13.5.1 | 1-150600.13.5.1 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_20 | before 1-150700.15.3.2 | 1-150700.15.3.2 |
| SUSE:Linux Enterprise Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_19 | before 1-150700.1.5.1 | 1-150700.1.5.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.235.1 | 5.14.21-150400.24.235.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.235.1.150400.24.118.3 | 5.14.21-150400.24.235.1.150400.24.118.3 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-rt | before 5.14.21-150400.15.181.1 | 5.14.21-150400.15.181.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source | before 5.14.21-150400.24.235.1 | 5.14.21-150400.24.235.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-source-rt | before 5.14.21-150400.15.181.1 | 5.14.21-150400.15.181.1 |
+28
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-31626Apr 24, 2026 · staging: rtl8723bs: initialize le_tmp64 in rtw_BIP_verify()28Monitor
- ← EarlierCVE-2026-31627Apr 24, 2026 · i2c: s3c24xx: check the size of the SMBUS message before using it31Monitor
- Later →CVE-2026-31629Apr 24, 2026 · nfc: llcp: add missing return after LLCP_CLOSED checks35Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 0548529af20e68c6552817834b766646dd3bd7a7 | Vendor (CNA) |
| Linux Linux | 1272cfedf4cd1019ddf583917a99b62f2d3645bb | Vendor (CNA) |
| Linux Linux | 3.17 | Vendor (CNA) |
| Linux Linux | 4.10 | Vendor (CNA) |
| Linux Linux | 4.5 | Vendor (CNA) |
| Linux Linux | 546785c719418c6166834a47e372a88f5f7ae893 | Vendor (CNA) |
| Linux Linux | 91f02726b2203b71545713ecb7fb006e60a2d66f | Vendor (CNA) |
| Linux Linux | ad17f07e95e6e8505e2153e5b391f0d27eacce25 | Vendor (CNA) |
| Linux Linux | b731aca06387b195058a9f6449a03b62efa1bd10 | Vendor (CNA) |
| Linux Linux | e55d98e7756135f32150b9b8f75d580d0d4b2dd3 | Vendor (CNA) |
| Linux Linux | e6af5286efe5a56128b34032572c9ce9ebeccda3 | Vendor (CNA) |
| Linux Linux | ed7a3a246309ccc807238f1b4f159ee6d37ff9c4 | Vendor (CNA) |
| azl3 kernel 6.6.134.1-2 on Azure Linux 3.0 | 6.6.137.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 | Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.170-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.235.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.235.1.150400.24.118.3 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_58 | 1-150400.9.7.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_44 | 1-150500.11.5.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP6_Update_30 | 1-150600.13.5.1 · SUSE:Linux Enterprise Live Patching 15 SP6 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150400.24.235.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150400.24.235.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150400.24.235.1 · SUSE:Linux Enterprise Server 15 SP4-LTSS | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP5_Update_86 | 1-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log (2)
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (11 more)Show less
- git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb
- git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893
- git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f
- git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25
- git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10
- git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3
- git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3
- git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4
- cert-portal.siemens.com/productcert/html/ssa-019113.html
- cert-portal.siemens.com/productcert/html/ssa-082556.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.