What’s Vulnerable › Vulnerabilities

CVE-2026-89792: ksmbd: prevent out-of-bounds reads in share config responses

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds reads in share config responses Validate IPC share configuration payload sizes before consuming variable-length fields. Bound veto list parsing and account for the separator byte when deriving the path length.

Affected products

• Linux kernel: from 5.15.157 before 5.15.222; from 6.1.85 before 6.1.189; from 6.6.26 before 6.6.158; from 6.8.5 before 6.9; 6.9 — fixed in 5.15.222, 6.1.189, 6.6.158, 6.9, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 5.15.222, 6.1.189, 6.6.158, 6.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c
• https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f
• https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8
• https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151
• https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34
• https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8
• https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263

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