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
Trending — 4 sources updated this week
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)
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 9× in last 7d / 75× 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 175 total refreshes for this CVE.

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

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.

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