Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-25. a secondary CVSS source baseline 9.8; sources differ by 0.0.
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: use opener credentials for ADS I/O
Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials.
Run ADS I/O with the credentials captured when the SMB handle was opened.
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).
July 25, 2026
August 17, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| linux | 6.1.106-1 ... 7.2~rc5-1~exp1 (338 versions) | — | — |
| linux-6.12 | — | 6.12.100-1~deb12u1 | — |
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| linux | 6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions) | 6.12.96-1 | — |
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| linux | 6.12.100-1 ... 7.1~rc7-1~exp1 (156 versions) | 7.1.4-1 | — |
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 255 total refreshes for this CVE.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-64391
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.