CVE-2026-90149

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-17. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: 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:

NFSv4/flexfiles: fix NULL dereference for NFSv4.0 data servers

flexfiles accepts NFSv4.0 data servers, but two NFSv4 code paths assume the data server client has a session. Unlike NFSv4.1+, an NFSv4.0 client has no session (clp->cl_session is NULL; it uses clp->cl_slot_tbl), so I/O to a v4.0 flexfiles DS oopses:

  • nfs4_init_ds_session() dereferences clp->cl_session->session_state
while seeding the DS lease. It also only seeds cl_lease_time when NFS4_SESSION_INITING is set; without a session that never happens, so cl_lease_time stays 0 and nfs4_renew_state() busy-loops, requeuing every 5 seconds. Seed the lease whenever there is no session and return before touching session state.
  • ff_layout_async_handle_error_v4() dereferences
clp->cl_session->fc_slot_table on every DS I/O error. Fall back to the v4.0 transport slot table (clp->cl_slot_tbl) when there is no session.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
38
EG Risk 38/100CISA 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
Severity75% × 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
47th
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 17, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 18, 2026
No patch confirmed yet.
generic

NFSv4/flexfiles: fix NULL dereference for NFSv4.0 data servers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/436a214514e24103159aea455147d58b44a8a585
generic

NFSv4/flexfiles: fix NULL dereference for NFSv4.0 data servers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2b03ebbf8d5e8f6af4ecd6c65375232dd1ec32cc
generic

NFSv4/flexfiles: fix NULL dereference for NFSv4.0 data servers - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/163c16e01f53fc8eb8d0f3484ae6c382265ecbbd

Vendor Advisories for CVE-2026-90149(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (358 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (181 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (178 versions)
  • every version up to 7.2.6-1: fixed in 7.2.6-1
—

Data Freshness Timeline

(refreshed 25× in last 7d / 68× 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 03:07 UTCEG score recompute
  2. 2026-10-05 03:07 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 13:58 UTCGHSA enrichment
  5. 2026-10-04 00:55 UTCEG score recompute
  6. 2026-10-04 00:55 UTCGHSA enrichment
  7. 2026-10-03 11:52 UTCGHSA enrichment
  8. 2026-10-02 22:19 UTCEG score recompute
  9. 2026-10-02 22:19 UTCGHSA enrichment
  10. 2026-10-02 09:16 UTCGHSA enrichment
  11. 2026-10-01 20:13 UTCEG score recompute
  12. 2026-10-01 20:13 UTCGHSA enrichment
  13. 2026-10-01 19:51 UTCEPSS rescore
  14. 2026-10-01 07:08 UTCGHSA enrichment
  15. 2026-09-30 18:05 UTCEG score recompute
  16. 2026-09-30 18:05 UTCGHSA enrichment
  17. 2026-09-30 15:04 UTCEPSS rescore
  18. 2026-09-30 05:01 UTCGHSA enrichment
  19. 2026-09-29 15:57 UTCEG score recompute
  20. 2026-09-29 15:57 UTCGHSA enrichment
  21. 2026-09-29 02:54 UTCEG score recompute
  22. 2026-09-29 02:54 UTCGHSA enrichment
  23. 2026-09-28 13:52 UTCEPSS rescore
  24. 2026-09-28 13:52 UTCEPSS rescore
  25. 2026-09-28 13:51 UTCGHSA enrichment
Show 43 more
  1. 2026-09-28 00:48 UTCEG score recompute
  2. 2026-09-28 00:48 UTCGHSA enrichment
  3. 2026-09-27 13:49 UTCEPSS rescore
  4. 2026-09-27 11:44 UTCGHSA enrichment
  5. 2026-09-26 22:41 UTCEG score recompute
  6. 2026-09-26 22:41 UTCGHSA enrichment
  7. 2026-09-26 15:59 UTCEPSS rescore
  8. 2026-09-26 09:34 UTCEG score recompute
  9. 2026-09-26 09:34 UTCGHSA enrichment
  10. 2026-09-25 20:27 UTCGHSA enrichment
  11. 2026-09-25 07:11 UTCGHSA enrichment
  12. 2026-09-24 18:08 UTCEG score recompute
  13. 2026-09-24 18:08 UTCGHSA enrichment
  14. 2026-09-24 14:04 UTCEPSS rescore
  15. 2026-09-24 05:05 UTCEG score recompute
  16. 2026-09-24 05:05 UTCGHSA enrichment
  17. 2026-09-23 17:54 UTCEPSS rescore
  18. 2026-09-23 16:01 UTCGHSA enrichment
  19. 2026-09-23 02:58 UTCEG score recompute
  20. 2026-09-23 02:58 UTCGHSA enrichment
  21. 2026-09-22 16:01 UTCEPSS rescore
  22. 2026-09-22 13:54 UTCGHSA enrichment
  23. 2026-09-22 00:51 UTCEG score recompute
  24. 2026-09-22 00:51 UTCGHSA enrichment
  25. 2026-09-21 21:09 UTCEPSS rescore
  26. 2026-09-21 11:48 UTCGHSA enrichment
  27. 2026-09-20 22:44 UTCEG score recompute
  28. 2026-09-20 22:44 UTCGHSA enrichment
  29. 2026-09-20 20:16 UTCEPSS rescore
  30. 2026-09-20 09:42 UTCGHSA enrichment
  31. 2026-09-19 20:38 UTCEG score recompute
  32. 2026-09-19 20:38 UTCGHSA enrichment
  33. 2026-09-19 07:35 UTCEG score recompute
  34. 2026-09-19 07:35 UTCGHSA enrichment
  35. 2026-09-18 19:28 UTCEPSS rescore
  36. 2026-09-18 18:31 UTCEG score recompute
  37. 2026-09-18 18:31 UTCGHSA enrichment
  38. 2026-09-18 18:05 UTCEG score recompute▲ 7.50
  39. 2026-09-18 18:05 UTCGHSA enrichment
  40. 2026-09-18 17:59 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  41. 2026-09-17 17:23 UTCNVD update
  42. 2026-09-17 16:45 UTCEG score recompute
  43. 2026-09-17 16:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-90149?
CVE-2026-90149 is a high vulnerability published on September 17, 2026. In the Linux kernel, the following vulnerability has been resolved: NFSv4/flexfiles: fix NULL dereference for NFSv4.0 data servers flexfiles accepts NFSv4.0 data servers, but two NFSv4 code paths assume the data server client has a session. Unlike NFSv4.1+, an NFSv4.0 client has no session…
When was CVE-2026-90149 disclosed?
CVE-2026-90149 was first published on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90149 actively exploited?
CVE-2026-90149 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-90149?
CVE-2026-90149 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-90149?
No fix for CVE-2026-90149 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-2026-90149 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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