CVE-2026-45851

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. NVD baseline CVSS 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

efi: Fix reservation of unaccepted memory table

The reserve_unaccepted() function incorrectly calculates the size of the memblock reservation for the unaccepted memory table. It aligns the size of the table, but fails to account for cases where the table's starting physical address (efi.unaccepted) is not page-aligned.

If the table starts at an offset within a page and its end crosses into a subsequent page that the aligned size does not cover, the end of the table will not be reserved. This can lead to the table being overwritten or inaccessible, causing a kernel panic in accept_memory().

This issue was observed when starting Intel TDX VMs with specific memory sizes (e.g., > 64GB).

Fix this by calculating the end address first (including the unaligned start) and then aligning it up, ensuring the entire range is covered by the reservation.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 25, 2026

Advisory Details (5)

Auto-updated Jun 25, 2026
No patch confirmed yet.
generic

efi: Fix reservation of unaccepted memory table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e649b5916725c68f44ebf45fb396df563c5dbaf2
generic

efi: Fix reservation of unaccepted memory table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ba6b6f1502fa55621d1db23f253d54322bdbe4e0
generic

efi: Fix reservation of unaccepted memory table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b7bc182ec1846be437351e44164089d988f9d0dd
generic

efi: Fix reservation of unaccepted memory table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9b18bf59977f5c5bc3b11b210520f62500a7adf3
generic

efi: Fix reservation of unaccepted memory table - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0862438c90487e79822d5647f854977d50381505

Vendor Advisories for CVE-2026-45851(1)

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

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-09-14ubuntu
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-09-14ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-09-14ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-14ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-09-14ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-09-14ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-14ubuntu
linuxKernel @ 6.6.128—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

(2 across 2 ecosystems)
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 ... 6.18~rc7-1~exp1 (103 versions)6.18.14-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(12)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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 227 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45851?
CVE-2026-45851 is a high vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: efi: Fix reservation of unaccepted memory table The reserve_unaccepted() function incorrectly calculates the size of the memblock reservation for the unaccepted memory table. It aligns the size of the table, but fails to account…
When was CVE-2026-45851 disclosed?
CVE-2026-45851 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45851 actively exploited?
CVE-2026-45851 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 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-45851?
CVE-2026-45851 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-45851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45851, 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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