Vulnerability · CVE-2026-64397
ZDI-26-684: Linux Kernel KSMBD Query Directory Request Race Condition Remote Code Execution Vulnerability
Published Sep 14, 2026 · ZDI-26-684: Linux Kernel KSMBD
Check if you run it
No confirmed exploitation is on record for CVE-2026-64397. EPSS is 0.48%. Act only if a listed version of ZDI-26-684: Linux Kernel KSMBD is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (ZDI-26-684: Linux Kernel KSMBD).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Critical9.0
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.48%
- Remediation
- Not established
- Affected products
- See sources for product scope
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. Furthermore, only systems with KSMBD enabled are vulnerable. The ZDI has assigned a CVSS rating of 9.0. The following CVEs are assigned: CVE-2026-64397.
No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.
How to fix CVE-2026-64397
Recommended remediation
No required-action text, fix commit, or clear fixed-version range is stored yet.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-64397. EPSS is 0.48%. Act only if a listed version of ZDI-26-684: Linux Kernel KSMBD is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Sep 14, 2026 · Catalog
Detected
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. Furthermore, only systems with KSMBD enabled are vulnerable. The ZDI has assigned a CVSS rating of 9.0. The following CVEs are assigned: CVE-2026-64397.
Sources
- CVE.orgVulnerability recordCVE-2026-64397
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-64397
30-day exploitation probability 0.5%
first.org - Zero Day InitiativeCoordinated disclosureZDI-26-684
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. Furthermore, only systems with KSMBD enabled are vulnerable. The ZDI has assigned a CVSS rating of 9.0. The following CVEs are assigned: CVE-2026-64397.
zerodayinitiative.com
Freshness
Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.