CVE-2026-90038

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: 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:

NFSD: Prevent client use-after-free during export state revocation

nfsd4_revoke_export_states() has the same use-after-free as nfsd4_revoke_states(): it drops nn->client_lock across revoke_one_stid() and the following read of clp->cl_minorversion, but the stateid reference it holds does not pin the client. A teardown racing the dropped lock can free the client while revoke_one_stid() still dereferences it.

exportfs -u drives this path through NFSD_CMD_UNLOCK_EXPORT, so an administrator removing an export can race a client expiry.

Skip a client that is already expiring and otherwise pin it with cl_rpc_users under client_lock before dropping the lock, matching nfsd4_revoke_states().

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity98% × 45%
Exploitation1% × 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
0.6%
EPSS %ILE
44th
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 total (CVSS ≥ 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 16, 2026

Last Modified

September 16, 2026

Advisory Details (2)

Auto-updated Sep 30, 2026
No patch confirmed yet.
generic

NFSD: Prevent client use-after-free during export state revocation - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c05ae58fe06ce2ac34312f649e71c3596bdde358
generic

NFSD: Prevent client use-after-free during export state revocation - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2108de53568a64936a0da3e04d85c35df98d3fb6

Vendor Advisories for CVE-2026-90038(1)

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

Data Freshness Timeline

(refreshed 60× in last 7d / 163× 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 163 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-90038?
CVE-2026-90038 is a critical vulnerability published on September 16, 2026. In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent client use-after-free during export state revocation nfsd4revokeexport_states() has the same use-after-free as nfsd4revokestates(): it drops nn->client_lock across revokeonestid() and the following read of…
When was CVE-2026-90038 disclosed?
CVE-2026-90038 was first published on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90038 actively exploited?
CVE-2026-90038 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-90038?
CVE-2026-90038 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-90038?
No fix for CVE-2026-90038 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-2026-90038 are linked in the Vendor Advisories panel on this page.

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