CVE-2026-31628

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-04-24. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

April 24, 2026

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated Jul 19, 2026
No patch confirmed yet.
generic

SSA-019113

https://cert-portal.siemens.com/productcert/html/ssa-019113.html
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ed7a3a246309ccc807238f1b4f159ee6d37ff9c4
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e6af5286efe5a56128b34032572c9ce9ebeccda3
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e55d98e7756135f32150b9b8f75d580d0d4b2dd3
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b731aca06387b195058a9f6449a03b62efa1bd10
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ad17f07e95e6e8505e2153e5b391f0d27eacce25
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/91f02726b2203b71545713ecb7fb006e60a2d66f
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/546785c719418c6166834a47e372a88f5f7ae893
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1272cfedf4cd1019ddf583917a99b62f2d3645bb
generic

x86/CPU: Fix FPDSS on Zen1 - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0548529af20e68c6552817834b766646dd3bd7a7

Vendor Advisories for CVE-2026-31628(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 5.10.253—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (53 versions)5.10.257-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (124 versions)6.19.13-1—

Additional Vendor Advisories

(24)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 53× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 212 total refreshes for this CVE.

  1. 2026-09-04 05:06 UTCEPSS rescore
  2. 2026-09-04 03:16 UTCOSV refresh
  3. 2026-09-02 14:11 UTCEPSS rescore
  4. 2026-09-01 13:53 UTCEPSS rescore
  5. 2026-09-01 04:39 UTCEPSS rescore
  6. 2026-09-01 04:39 UTCEPSS rescore
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 01:22 UTCEPSS rescore
  9. 2026-08-28 21:41 UTCEPSS rescore
  10. 2026-08-27 14:25 UTCEPSS rescore
  11. 2026-08-26 14:46 UTCEPSS rescore
  12. 2026-08-25 13:49 UTCEPSS rescore
  13. 2026-08-24 14:17 UTCEPSS rescore
  14. 2026-08-23 00:19 UTCEPSS rescore
  15. 2026-08-21 23:49 UTCEPSS rescore
  16. 2026-08-20 22:55 UTCEPSS rescore
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-19 17:03 UTCEPSS rescore
  19. 2026-08-18 13:48 UTCEPSS rescore
  20. 2026-08-17 14:51 UTCEG score recompute
  21. 2026-08-17 14:51 UTCVendor advisory
  22. 2026-08-17 14:51 UTCGHSA enrichment
  23. 2026-08-17 13:47 UTCEPSS rescore
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 05:47 UTCEG score recompute
Show 75 more
  1. 2026-08-16 05:47 UTCVendor advisory
  2. 2026-08-16 05:47 UTCGHSA enrichment
  3. 2026-08-16 02:14 UTCEPSS rescore
  4. 2026-08-15 01:30 UTCEPSS rescore
  5. 2026-08-14 04:07 UTCEG score recompute
  6. 2026-08-14 04:07 UTCVendor advisory
  7. 2026-08-14 04:07 UTCGHSA enrichment
  8. 2026-08-13 22:00 UTCEPSS rescore
  9. 2026-08-12 17:49 UTCEG score recompute
  10. 2026-08-12 17:49 UTCVendor advisory
  11. 2026-08-12 17:49 UTCGHSA enrichment
  12. 2026-08-12 13:50 UTCEPSS rescore
  13. 2026-08-11 05:04 UTCEG score recompute
  14. 2026-08-11 05:04 UTCVendor advisory
  15. 2026-08-11 05:04 UTCGHSA enrichment
  16. 2026-08-11 00:00 UTCEPSS rescore
  17. 2026-08-10 04:11 UTCEG score recompute
  18. 2026-08-10 04:11 UTCVendor advisory
  19. 2026-08-10 04:11 UTCGHSA enrichment
  20. 2026-08-09 13:46 UTCEPSS rescore
  21. 2026-08-09 03:19 UTCEG score recompute
  22. 2026-08-09 03:19 UTCVendor advisory
  23. 2026-08-09 03:19 UTCGHSA enrichment
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-07 12:34 UTCEG score recompute
  26. 2026-08-07 12:34 UTCVendor advisory
  27. 2026-08-07 12:34 UTCGHSA enrichment
  28. 2026-08-06 13:46 UTCEPSS rescore
  29. 2026-08-05 22:56 UTCEG score recompute
  30. 2026-08-05 22:56 UTCVendor advisory
  31. 2026-08-05 22:56 UTCGHSA enrichment
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-04 15:10 UTCEPSS rescore
  34. 2026-08-04 10:38 UTCEPSS rescore
  35. 2026-08-03 21:01 UTCEG score recompute
  36. 2026-08-03 21:01 UTCVendor advisory
  37. 2026-08-03 21:01 UTCGHSA enrichment
  38. 2026-08-03 10:36 UTCEPSS rescore
  39. 2026-08-02 11:21 UTCEG score recompute
  40. 2026-08-02 11:21 UTCVendor advisory
  41. 2026-08-02 11:21 UTCGHSA enrichment
  42. 2026-08-02 02:27 UTCEPSS rescore
  43. 2026-08-01 04:16 UTCEPSS rescore
  44. 2026-07-30 16:28 UTCEPSS rescore
  45. 2026-07-30 01:30 UTCEPSS rescore
  46. 2026-07-28 15:36 UTCEPSS rescore
  47. 2026-07-26 14:54 UTCEPSS rescore
  48. 2026-07-26 14:54 UTCEPSS rescore
  49. 2026-07-25 14:18 UTCEPSS rescore
  50. 2026-07-25 14:17 UTCEPSS rescore
  51. 2026-07-24 14:17 UTCEPSS rescore
  52. 2026-07-23 14:18 UTCEPSS rescore
  53. 2026-07-23 14:18 UTCEPSS rescore
  54. 2026-07-23 03:08 UTCEG score recompute
  55. 2026-07-22 14:08 UTCEPSS rescore
  56. 2026-07-22 14:08 UTCEPSS rescore
  57. 2026-07-21 15:24 UTCEPSS rescore
  58. 2026-07-21 15:24 UTCEPSS rescore
  59. 2026-07-20 17:08 UTCEPSS rescore
  60. 2026-07-20 17:08 UTCEPSS rescore
  61. 2026-07-19 23:08 UTCOSV refresh
  62. 2026-07-19 14:31 UTCEPSS rescore
  63. 2026-07-19 14:31 UTCEPSS rescore
  64. 2026-07-19 02:29 UTCEPSS rescore
  65. 2026-07-18 10:04 UTCEPSS rescore
  66. 2026-07-18 10:04 UTCEPSS rescore
  67. 2026-07-16 17:03 UTCEPSS rescore
  68. 2026-07-16 17:03 UTCEPSS rescore
  69. 2026-07-15 16:57 UTCEPSS rescore
  70. 2026-07-15 16:57 UTCEPSS rescore
  71. 2026-07-15 02:00 UTCEPSS rescore
  72. 2026-07-15 02:00 UTCEPSS rescore
  73. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  74. 2026-07-13 22:30 UTCEPSS rescore
  75. 2026-07-13 06:13 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-31628?
CVE-2026-31628 is a medium vulnerability published on April 24, 2026. 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.
When was CVE-2026-31628 disclosed?
CVE-2026-31628 was first published in the National Vulnerability Database on April 24, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31628 actively exploited?
CVE-2026-31628 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.2% of all scored CVEs.
What is the CVSS score of CVE-2026-31628?
CVE-2026-31628 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-31628?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31628, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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