CVE-2023-1076

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2023-03-27. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAP_NET_ADMIN, it may not always be the case, e.g., a non-root user only having that capability. This would make tun/tap sockets being incorrectly treated in filtering/routing decisions, possibly bypassing network filters.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
17.3%
KEV
Not listed

Published

March 27, 2023

Last Modified

February 24, 2025

References (6)

Vendor Advisories for CVE-2023-1076(1)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-oem-22.04c (6.1.0.1009.9) @ jammy2026-05-25ubuntu
ubuntulinux-image-lowlatency (5.19.0.1027.23) @ kinetic2026-05-25ubuntu
ubuntulinux-image-unsigned-5.15.0-1022-gkeop (5.15.0-1022.27) @ jammy2026-05-25ubuntu
ubuntulinux-headers-5.4.0-1024-xilinx-zynqmp (5.4.0-1024.28) @ focal2026-05-25ubuntu
ubuntulinux-tools-iot (5.4.0.1017.15) @ focal2026-05-25ubuntu
ubuntulinux-tools-oem-22.04b (6.0.0.1021.21) @ jammy2026-05-25ubuntu
ubuntulinux-ibm-cloud-tools-common (5.19.0-1024.26) @ kinetic2026-05-25ubuntu
ubuntulinux-intel-iotg-cloud-tools-5.15.0-1033 (5.15.0-1033.38) @ jammy2026-05-25ubuntu
ubuntulinux-headers-azure-fde (5.15.0.1041.48.19) @ jammy2026-05-25ubuntu
ubuntulinux-modules-5.4.0-1065-bluefield (5.4.0-1065.71) @ focal2026-05-25ubuntu
redhatkernel-0:5.14.0-362.8.1.el9_32023-11-07redhat

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(2)

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

Additional Vendor Advisories

(10)

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 13× in last 7d / 47× 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.

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

Frequently asked(5)

What is CVE-2023-1076?
CVE-2023-1076 is a medium vulnerability published on March 27, 2023. A flaw was found in the Linux Kernel. The tun/tap sockets have their socket UID hardcoded to 0 due to a type confusion in their initialization function. While it will be often correct, as tuntap devices require CAPNETADMIN, it may not always be the case, e.g., a non-root user only having that…
When was CVE-2023-1076 disclosed?
CVE-2023-1076 was first published in the National Vulnerability Database on March 27, 2023, with the most recent update on February 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-1076 actively exploited?
CVE-2023-1076 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-1076?
CVE-2023-1076 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2023-1076?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-1076, 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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