CVE-2026-43350

HIGHPre-NVD 7.67.6—
EchelonGraph scoreMEDIUM confidence

Score 7.6 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. the CNA's CVSS baseline 7.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
7.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.6Exploit: None knownExposed: 0

A fix is available — apply it.

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

smb: client: require a full NFS mode SID before reading mode bits

parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits.

That assumes the ACE carries three subauthorities, but compare_sids() only compares min(a, b) subauthorities. A malicious server can return an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still matches sid_unix_NFS_mode and then drives the sub_auth[2] read four bytes past the end of the ACE.

Require num_subauth >= 3 before treating the ACE as an NFS mode SID. This keeps the fix local to the special-SID mode path without changing compare_sids() semantics for the rest of cifsacl.

CVSS v3
7.6
EG Score
7.6(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity76% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

May 8, 2026

Last Modified

August 5, 2026

Advisory Details (5)

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

smb: client: require a full NFS mode SID before reading mode bits - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f8488c07bea2431ee12a6067d736578064fa46b4
generic

smb: client: require a full NFS mode SID before reading mode bits - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c8eef12af1cc73031639ea7cf16e0b10e2536b0b
generic

smb: client: require a full NFS mode SID before reading mode bits - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b53b8e98c23310294fc45fc686db5ee860311896
generic

smb: client: require a full NFS mode SID before reading mode bits - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/38a69f08ee82c450d3e4168707fff2e317dc3ff7
generic

smb: client: require a full NFS mode SID before reading mode bits - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2757ad3e4b6f9e0fed4c7739594e702abc5cab21

Vendor Advisories for CVE-2026-43350(1)

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

Patch Availability(20)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-28.28~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-27.27) @ resolute2026-08-23ubuntu
ubuntulinux-tools-raspi-realtime-7.0 (7.0.0-1014.14) @ resolute2026-08-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1013.13) @ resolute2026-08-23ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-22.04-edge (6.8.0-136.136.2~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-7.0 (7.0.0-1009.9) @ resolute2026-08-23ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-08-23ubuntu
ubuntulinux-tools-ibm-edge (6.8.0-1061.62~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-23ubuntu
linuxKernel @ 5.10.259—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

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (54 versions)5.10.259-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.174-1~deb11u1 (20 versions)6.1.176-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (53 versions)6.1.176-1—
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 ... 7.0.1-1~exp1 (132 versions)7.0.3-1—

All Vendor Advisories

(19)

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 6× in last 7d / 30× 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 215 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43350?
CVE-2026-43350 is a high vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: require a full NFS mode SID before reading mode bits parsedacl() treats an ACE SID matching sidunixNFSmode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits. That assumes the ACE carries three…
When was CVE-2026-43350 disclosed?
CVE-2026-43350 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-2026-43350 actively exploited?
CVE-2026-43350 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 86.9% of all scored CVEs.
What is the CVSS score of CVE-2026-43350?
CVE-2026-43350 has a CVSS v4.0 base score of 7.6 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-43350?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43350, 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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