CVE-2026-43215

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

cifs: Fix locking usage for tcon fields

We used to use the cifs_tcp_ses_lock to protect a lot of objects that are not just the server, ses or tcon lists. We later introduced srv_lock, ses_lock and tc_lock to protect fields within the corresponding structs. This was done to provide a more granular protection and avoid unnecessary serialization.

There were still a couple of uses of cifs_tcp_ses_lock to provide tcon fields. In this patch, I've replaced them with tc_lock.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

May 6, 2026

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated May 11, 2026
No patch confirmed yet.
generic

cifs: Fix locking usage for tcon fields - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/96c4af418586ee9a6aab61738644366426e05316
generic

cifs: Fix locking usage for tcon fields - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/953953abb66e52c224057ab91e404284fefeab62
generic

cifs: Fix locking usage for tcon fields - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8c59eeeeffa1524ef57e173a89a1a3ff539888d5
generic

cifs: Fix locking usage for tcon fields - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/601dd3b79769b38d30b693c40afdb2a4b7edf9d0
generic

cifs: Fix locking usage for tcon fields - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3969db6b22e3d90d8c5f22ac1a7fe0350a94c136

Patch Availability(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1055.56~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-08-23ubuntu
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-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-23ubuntu
linuxKernel @ 6.6.128—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 ... 7.2~rc7-1~exp1 (350 versions)——
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 (116 versions)6.19.6-1—

Weakness Classification(1)

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

All Vendor Advisories

(12)

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 / 28× 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 219 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43215?
CVE-2026-43215 is a high vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: cifs: Fix locking usage for tcon fields We used to use the cifstcpses_lock to protect a lot of objects that are not just the server, ses or tcon lists. We later introduced srvlock, seslock and tc_lock to protect fields within the…
When was CVE-2026-43215 disclosed?
CVE-2026-43215 was first published in the National Vulnerability Database on May 6, 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-2026-43215 actively exploited?
CVE-2026-43215 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 77.3% of all scored CVEs.
What is the CVSS score of CVE-2026-43215?
CVE-2026-43215 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-43215?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43215, 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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