CVE-2026-64379

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-25. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

A fix is available — apply it.

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

smb: client: mask server-provided mode to 07777 in modefromsid

When modefromsid is active, parse_dacl() applies the server-provided sub_auth[2] value from the NFS mode SID to cf_mode without masking to

  • Apply the correct masking, same as in the read path.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

July 25, 2026

Last Modified

August 17, 2026

Advisory Details (8)

Auto-updated Jul 27, 2026
No patch confirmed yet.
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f80add1bfb3425100a325b14f19648e75669a954
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f511807feee7cb29b61bdfa86472c7e9e2e5df94
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ee2216dbdf0c677e89bb43e03247dba590ed00ef
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e3d9c7160d483fc8f9e225aafad8ecbbc43f3151
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c6c484a7d5bff6b929a86d7ed5130f29834c6a0d
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b84e002e0df26bbc6cbd3ca01b8212601fe0ae7d
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5f6f2241034f189c69d4d0b5f8fe24a0c25b0c14
generic

smb: client: mask server-provided mode to 07777 in modefromsid - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/08c600b7e1818539ba5efee4cdb06215c245ca78

Vendor Advisories for CVE-2026-64379(3)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-rt-0:4.18.0-553.157.1.rt7.498.el8_102026-08-20redhat
redhatkernel-0:4.18.0-553.157.1.el8_102026-08-20redhat
redhatkernel-0:5.14.0-687.41.1.el9_82026-08-20redhat
redhatkernel-0:6.12.0-211.49.1.el10_22026-08-20redhat

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

(6 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (55 versions)5.10.262-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.177-1~deb11u1 (22 versions)6.1.180-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (55 versions)6.1.180-1—
linux-6.12—6.12.100-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions)6.12.96-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (156 versions)7.1.4-1—

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 45× in last 7d / 143× 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 143 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64379?
CVE-2026-64379 is a high vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: smb: client: mask server-provided mode to 07777 in modefromsid When modefromsid is active, parse_dacl() applies the server-provided subauth[2] value from the NFS mode SID to cfmode without masking to 07777. Apply the correct…
When was CVE-2026-64379 disclosed?
CVE-2026-64379 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64379 actively exploited?
CVE-2026-64379 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 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-64379?
CVE-2026-64379 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-64379?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64379, 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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