CVE-2026-45991

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-27. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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

udf: fix partition descriptor append bookkeeping

Mounting a crafted UDF image with repeated partition descriptors can trigger a heap out-of-bounds write in part_descs_loc[].

handle_partition_descriptor() deduplicates entries by partition number, but appended slots never record partnum. As a result duplicate Partition Descriptors are appended repeatedly and num_part_descs keeps growing.

Once the table is full, the growth path still sizes the allocation from partnum even though inserts are indexed by num_part_descs. If partnum is already aligned to PART_DESC_ALLOC_STEP, ALIGN(partnum, step) can keep the old capacity and the next append writes past the end of the table.

Store partnum in the appended slot and size growth from the next append count so deduplication and capacity tracking follow the same model.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
6.5%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 19, 2026

Advisory Details (4)

Auto-updated Jun 3, 2026
No patch confirmed yet.
generic

udf: fix partition descriptor append bookkeeping - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39a
generic

udf: fix partition descriptor append bookkeeping - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/08fa5d818e5bf53c7ca234d88ba334f32004e9b6
generic

udf: fix partition descriptor append bookkeeping - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/08841b06fa64d8edbd1a21ca6e613420c90cc4b8
generic

udf: fix partition descriptor append bookkeeping - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/058b451b1039f056d1362c4fec2229e522366ab0

Vendor Advisories for CVE-2026-45991(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 / 80× 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 189 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45991?
CVE-2026-45991 is a high vulnerability published on May 27, 2026. In the Linux kernel, the following vulnerability has been resolved: udf: fix partition descriptor append bookkeeping Mounting a crafted UDF image with repeated partition descriptors can trigger a heap out-of-bounds write in partdescsloc[]. handlepartitiondescriptor() deduplicates entries by…
When was CVE-2026-45991 disclosed?
CVE-2026-45991 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-2026-45991 actively exploited?
CVE-2026-45991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45991?
CVE-2026-45991 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-45991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45991, 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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