CVE-2026-43378

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 76% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

smb: server: fix use-after-free in smb2_open()

The opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is dereferenced after rcu_read_unlock(), creating a use-after-free window.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

May 8, 2026

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

smb: server: fix use-after-free in smb2_open() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1e689a56173827669a35da7cb2a3c78ed5c53680
generic

smb: server: fix use-after-free in smb2_open() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/190e5f808e8058640b408ccfed25440b441a718a
generic

smb: server: fix use-after-free in smb2_open() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8f5b1a7cb009a93c48e9e334a2f59a660f9afc07
generic

smb: server: fix use-after-free in smb2_open() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/54b48ae83de8bb06e65079d96368efe359d4909c
generic

smb: server: fix use-after-free in smb2_open() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b720c84087cb547f23ce03eab93568c1769e4556
generic

smb: server: fix use-after-free in smb2_open() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e1b21e6066615e7d3d3a7aa2677e415e563fd7cc

Vendor Advisories for CVE-2026-43378(1)

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

Patch Availability(27)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-40.40) @ questing2026-08-23ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1028.28) @ noble2026-08-23ubuntu
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1055.56~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1057.58~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04 (6.17.0-1026.26) @ noble2026-08-23ubuntu
ubuntulinux-tools-realtime-hwe-24.04-edge (6.17.0-1017.19) @ questing2026-08-23ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-08-23ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-24.04 (6.17.0-40.40~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1110.106) @ jammy2026-08-23ubuntu
ubuntulinux-tools-raspi-6.17 (6.17.0-1021.21) @ questing2026-08-23ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1021.21~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.17 (6.17.0-1018.18~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1076 (5.15.0-1076.80) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1054.56) @ jammy2026-08-23ubuntu
ubuntulinux-tools-azure-fde-edge (5.15.0.1118.127~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-gcp-lts-22.04 (5.15.0.1114.111) @ jammy2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (5.15.0.190.157) @ jammy2026-08-23ubuntu
linuxKernel @ 6.1.167—osv

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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (119 versions)6.19.10-1—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 118× 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 275 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43378?
CVE-2026-43378 is a critical vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: server: fix use-after-free in smb2_open() The opinfo pointer obtained via rcudereference(fp->fopinfo) is dereferenced after rcureadunlock(), creating a use-after-free window.
When was CVE-2026-43378 disclosed?
CVE-2026-43378 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43378 actively exploited?
CVE-2026-43378 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 76.8% of all scored CVEs.
What is the CVSS score of CVE-2026-43378?
CVE-2026-43378 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-43378?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43378, 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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