CVE-2018-13405

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
59.2%
KEV
Not listed

Published

July 6, 2018

Last Modified

November 21, 2024

References (56)

Vendor Advisories for CVE-2018-13405(1)

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

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-extra-4.4.0-134-generic (4.4.0-134.160) @ xenial2026-05-28ubuntu
ubuntulinux-image-unsigned-4.15.0-33-lowlatency (4.15.0-33.36~16.04.1) @ xenial2026-05-28ubuntu
ubuntulinux-image-unsigned-4.15.0-33-lowlatency (4.15.0-33.36) @ bionic2026-05-28ubuntu
ubuntulinux-image-extra-4.4.0-134-generic (4.4.0-134.160~14.04.1) @ trusty2026-05-28ubuntu
ubuntulinux-image-unsigned-4.15.0-1022-azure (4.15.0-1022.22~16.04.1) @ xenial2026-05-28ubuntu
ubuntulinux-image-extra-3.13.0-157-generic (3.13.0-157.207) @ trusty2026-05-28ubuntu
redhatkernel-0:3.10.0-514.71.1.el72019-12-10redhat
redhatkernel-0:3.10.0-327.83.1.el72019-12-10redhat
redhatkernel-0:3.10.0-693.58.1.el72019-09-12redhat
redhatkernel-rt-1:3.10.0-693.58.1.rt56.652.el6rt2019-09-11redhat
redhatkernel-0:3.10.0-862.41.1.el72019-08-27redhat
redhatkernel-0:2.6.32-504.80.2.el62019-08-13redhat
redhatkernel-0:2.6.32-754.12.1.el62019-04-09redhat
redhatkernel-0:3.10.0-957.el72018-10-30redhat
redhatkernel-alt-0:4.14.0-115.el7a2018-10-30redhat
redhatkernel-rt-0:3.10.0-957.rt56.910.el72018-10-30redhat

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

(15)

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 8× in last 7d / 39× 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. 2026-07-16 16:59 UTCEPSS rescore
  2. 2026-07-16 16:59 UTCEPSS rescore
  3. 2026-07-15 16:55 UTCEPSS rescore
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  11. 2026-07-07 13:42 UTCEPSS rescore
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  13. 2026-07-06 16:24 UTCEPSS rescore
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  15. 2026-07-06 02:20 UTCEPSS rescore
  16. 2026-07-05 02:27 UTCEPSS rescore
  17. 2026-07-04 06:28 UTCEPSS rescore
  18. 2026-07-04 05:26 UTCOSV refresh
  19. 2026-07-02 16:54 UTCEPSS rescore
  20. 2026-07-01 15:03 UTCEPSS rescore
  21. 2026-07-01 15:03 UTCEPSS rescore
  22. 2026-06-29 14:03 UTCEPSS rescore
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  24. 2026-06-28 04:53 UTCEPSS rescore
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  1. 2026-06-27 03:06 UTCEPSS rescore
  2. 2026-06-25 13:47 UTCEPSS rescore
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  4. 2026-06-24 14:02 UTCEPSS rescore
  5. 2026-06-24 14:02 UTCEPSS rescore
  6. 2026-06-23 21:30 UTCEPSS rescore
  7. 2026-06-22 14:23 UTCEPSS rescore
  8. 2026-06-21 14:54 UTCEPSS rescore
  9. 2026-06-21 14:54 UTCEPSS rescore
  10. 2026-06-21 01:57 UTCEPSS rescore
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  12. 2026-06-19 19:23 UTCEPSS rescore
  13. 2026-06-18 17:50 UTCEPSS rescore
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  17. 2026-06-16 17:50 UTCEPSS rescore
  18. 2026-06-16 17:50 UTCEPSS rescore
  19. 2026-06-15 17:45 UTCEPSS rescore
  20. 2026-06-15 17:13 UTCOSV refresh
  21. 2026-06-14 23:14 UTCEPSS rescore
  22. 2026-06-14 23:14 UTCEPSS rescore
  23. 2026-06-13 22:58 UTCEPSS rescore
  24. 2026-06-13 22:58 UTCEPSS rescore
  25. 2026-06-12 23:09 UTCEPSS rescore
  26. 2026-06-11 13:57 UTCEPSS rescore
  27. 2026-06-10 22:16 UTCEPSS rescore
  28. 2026-06-10 13:19 UTCEPSS rescore
  29. 2026-06-08 14:14 UTCEPSS rescore
  30. 2026-06-08 14:14 UTCEPSS rescore
  31. 2026-06-07 15:22 UTCEPSS rescore
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  35. 2026-06-05 22:45 UTCEPSS rescore
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  37. 2026-06-05 06:08 UTCEPSS rescore
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  39. 2026-06-04 13:10 UTCEPSS rescore
  40. 2026-06-04 13:10 UTCEPSS rescore
  41. 2026-06-02 20:11 UTCEPSS rescore
  42. 2026-06-02 20:11 UTCEPSS rescore
  43. 2026-06-01 13:49 UTCEPSS rescore
  44. 2026-05-31 22:29 UTCEPSS rescore
  45. 2026-05-31 22:28 UTCEPSS rescore
  46. 2026-05-31 00:14 UTCEPSS rescore
  47. 2026-05-31 00:14 UTCEPSS rescore
  48. 2026-05-29 13:41 UTCEPSS rescore
  49. 2026-05-28 13:42 UTCEPSS rescore
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-28 05:53 UTCEG score recompute
  52. 2026-05-28 05:53 UTCVendor advisory
  53. 2026-05-28 05:53 UTCGHSA enrichment
  54. 2026-05-27 13:38 UTCEPSS rescore
  55. 2026-05-27 13:38 UTCEPSS rescore
  56. 2026-05-26 13:42 UTCEPSS rescore
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  58. 2026-05-26 07:17 UTCEPSS rescore
  59. 2026-05-26 07:17 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-45033✓ verified
    First seen Jul 16, 2018

    Linux (Ubuntu) - Other Users coredumps Can Be Read via setgid Directory and killpriv Bypass

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-13405?
CVE-2018-13405 is a high vulnerability published on July 6, 2018. The inodeinitowner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger…
When was CVE-2018-13405 disclosed?
CVE-2018-13405 was first published in the National Vulnerability Database on July 6, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-13405 actively exploited?
CVE-2018-13405 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-13405?
CVE-2018-13405 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2018-13405?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-13405, 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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