CVE-2026-45999

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

A fix is available — apply it.

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

erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap()

Some crafted images can have illegal (!partial_decoding && m_llen < m_plen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages < inpages) properly: "outpages - inpages" wraps to a large value and the subsequent rq->out[] access reads past the decompressed_pages array.

However, such crafted cases can correctly result in a corruption report in the normal LZ4 non-inplace path.

Let's add an additional check to fix this for backporting.

Reproducible image (base64-encoded gzipped blob):

H4sIAJGR12kCA+3SPUoDQRgG4MkmkkZk8QRbRFIIi9hbpEjrHQI5ghfwCN5BLCzTGtLbBI+g dilSJo1CnIm7GEXFxhT6PDDwfrs73/ywIQD/1ePD4r7Ou6ETsrq4mu7XcWfj++Pb58nJU/9i PNtbjhan04/9GtX4qVYc814WDqt6FaX5s+ZwXXeq52lndT6IuVvlblytLMvh4Gzwaf90nsvz 2DF/21+20T/ldgp5s1jXRaN4t/8izsy/OUB6e/Qa79r+JwAAAAAAAL52vQVuGQAAAP6+my1w ywAAAAAAAADwu14ATsEYtgBQAAA=

$ mount -t erofs -o cache_strategy=disabled foo.erofs /mnt $ dd if=/mnt/data of=/dev/null bs=4096 count=1

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
3.1%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 19, 2026

Advisory Details (5)

Auto-updated Jun 11, 2026
No patch confirmed yet.
generic

erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f1374fa6e57fd836623668d782ded9244cfd2938
generic

erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c9ce18e6bb2c467ec85756dc7989b547b7584fee
generic

erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bbbbb3f0d7864238a8da2a94cd6ec013fee06a2e
generic

erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/43a878639b90e9721ffa5eb616a7e6d8454adef3
generic

erofs: fix unsigned underflow in z_erofs_lz4_handle_overlap() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/21e161de2dc660b1bb70ef5b156ab8e6e1cca3ab

Vendor Advisories for CVE-2026-45999(2)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-27.27) @ resolute2026-07-11ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1008.8) @ resolute2026-07-11ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1014.14) @ resolute2026-07-11ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1013.13) @ resolute2026-07-11ubuntu

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(4)

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 7× in last 7d / 56× 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 140 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45999?
CVE-2026-45999 is a high vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: erofs: fix unsigned underflow in zerofslz4handleoverlap() Some crafted images can have illegal (!partial_decoding && mllen < mplen) extents, and the LZ4 inplace decompression path can be wrongly hit, but it cannot handle (outpages…
When was CVE-2026-45999 disclosed?
CVE-2026-45999 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45999 actively exploited?
CVE-2026-45999 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45999?
CVE-2026-45999 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-45999?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45999, 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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