CVE-2026-93786

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-24. A secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.1Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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

ksmbd: preserve VFS inherited POSIX ACL mask

The VFS initializes a child's POSIX ACL from the parent's default ACL and the requested creation mode. Do not mutate the parent ACL or overwrite the child's VFS-computed access and default ACLs afterwards.

This preserves restrictive ACL_MASK entries and prevents SMB object creation from widening effective permissions.

CVSS v3
8.1
EG Score
8.1HIGHhigh confidence
EG Risk
41
EG Risk 41/100CISA SSVC

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
Severity81% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
25th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 24, 2026

Last Modified

October 3, 2026

Advisory Details (3)

Auto-updated Sep 25, 2026
No patch confirmed yet.
generic

ksmbd: preserve VFS inherited POSIX ACL mask - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a
generic

ksmbd: preserve VFS inherited POSIX ACL mask - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70
generic

ksmbd: preserve VFS inherited POSIX ACL mask - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0

Vendor Advisories for CVE-2026-93786(2)

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

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1, 6.12.107-1~deb12u1
  • every version up to 6.12.111-1~deb12u1: fixed in 6.12.111-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (35 versions)
  • every version up to 6.12.111-1: fixed in 6.12.111-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (179 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 44× in last 7d / 66× 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. 2026-10-05 08:03 UTCEG score recompute
  2. 2026-10-05 08:03 UTCVendor advisory
  3. 2026-10-05 08:03 UTCGHSA enrichment
  4. 2026-10-04 23:23 UTCEPSS rescore
  5. 2026-10-04 20:55 UTCVendor advisory
  6. 2026-10-04 20:55 UTCGHSA enrichment
  7. 2026-10-04 09:48 UTCVendor advisory
  8. 2026-10-04 09:48 UTCGHSA enrichment
  9. 2026-10-03 22:40 UTCEG score recompute
  10. 2026-10-03 22:40 UTCVendor advisory
  11. 2026-10-03 22:40 UTCGHSA enrichment
  12. 2026-10-03 14:26 UTCEPSS rescore
  13. 2026-10-03 11:33 UTCVendor advisory
  14. 2026-10-03 11:33 UTCGHSA enrichment
  15. 2026-10-03 00:16 UTCEG score recompute
  16. 2026-10-03 00:16 UTCVendor advisory
  17. 2026-10-03 00:16 UTCGHSA enrichment
  18. 2026-10-02 13:09 UTCVendor advisory
  19. 2026-10-02 13:08 UTCGHSA enrichment
  20. 2026-10-02 01:57 UTCEG score recompute
  21. 2026-10-02 01:57 UTCVendor advisory
  22. 2026-10-02 01:57 UTCGHSA enrichment
  23. 2026-10-01 19:51 UTCEPSS rescore
  24. 2026-10-01 14:50 UTCVendor advisory
  25. 2026-10-01 14:50 UTCGHSA enrichment
Show 41 more
  1. 2026-10-01 03:43 UTCVendor advisory
  2. 2026-10-01 03:43 UTCGHSA enrichment
  3. 2026-09-30 16:36 UTCEG score recompute
  4. 2026-09-30 16:36 UTCVendor advisory
  5. 2026-09-30 16:36 UTCGHSA enrichment
  6. 2026-09-30 15:04 UTCEPSS rescore
  7. 2026-09-30 05:22 UTCVendor advisory
  8. 2026-09-30 05:22 UTCGHSA enrichment
  9. 2026-09-29 18:15 UTCEG score recompute
  10. 2026-09-29 18:15 UTCVendor advisory
  11. 2026-09-29 18:15 UTCGHSA enrichment
  12. 2026-09-29 06:39 UTCEG score recompute
  13. 2026-09-29 06:39 UTCVendor advisory
  14. 2026-09-29 06:39 UTCGHSA enrichment
  15. 2026-09-28 19:33 UTCEG score recompute
  16. 2026-09-28 19:33 UTCVendor advisory
  17. 2026-09-28 19:32 UTCGHSA enrichment
  18. 2026-09-28 13:52 UTCEPSS rescore
  19. 2026-09-28 13:52 UTCEPSS rescore
  20. 2026-09-28 08:22 UTCVendor advisory
  21. 2026-09-28 08:22 UTCGHSA enrichment
  22. 2026-09-27 21:14 UTCEG score recompute
  23. 2026-09-27 21:14 UTCGHSA enrichment
  24. 2026-09-27 13:49 UTCEPSS rescore
  25. 2026-09-27 10:06 UTCGHSA enrichment
  26. 2026-09-26 22:59 UTCEG score recompute
  27. 2026-09-26 22:59 UTCGHSA enrichment
  28. 2026-09-26 15:59 UTCEPSS rescore
  29. 2026-09-26 11:52 UTCGHSA enrichment
  30. 2026-09-26 00:44 UTCEG score recompute
  31. 2026-09-26 00:44 UTCGHSA enrichment
  32. 2026-09-25 13:24 UTCEG score recompute
  33. 2026-09-25 13:23 UTCGHSA enrichment
  34. 2026-09-25 12:57 UTCEG score recompute
  35. 2026-09-25 12:57 UTCGHSA enrichment
  36. 2026-09-25 05:18 UTCEG score recompute▲ 8.10
  37. 2026-09-25 05:18 UTCGHSA enrichment
  38. 2026-09-25 05:16 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  39. 2026-09-24 17:33 UTCNVD update
  40. 2026-09-24 16:30 UTCEG score recompute
  41. 2026-09-24 16:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-93786?
CVE-2026-93786 is a high vulnerability published on September 24, 2026. In the Linux kernel, the following vulnerability has been resolved: ksmbd: preserve VFS inherited POSIX ACL mask The VFS initializes a child's POSIX ACL from the parent's default ACL and the requested creation mode. Do not mutate the parent ACL or overwrite the child's VFS-computed access and…
When was CVE-2026-93786 disclosed?
CVE-2026-93786 was first published on September 24, 2026, with the most recent update on October 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93786 actively exploited?
CVE-2026-93786 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-93786?
CVE-2026-93786 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-93786?
No fix for CVE-2026-93786 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-93786 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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