What’s Vulnerable › Vulnerabilities

CVE-2026-93786: ksmbd: preserve VFS inherited POSIX ACL mask

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: preserve VFS inherited POSIX ACL mask The VFS initializes a child's POSIX ACL from the parent's default ACL and the requested creation mode. Do not mutate the parent ACL or overwrite the child's VFS-computed access and default ACLs afterwards. This preserves restrictive ACL_MASK entries and prevents SMB object creation from widening effective permissions.

Affected products

• Linux: 5.15 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0
• https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f
• https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70
• https://git.kernel.org/stable/c/8493da704275ca5ab67fb88c0ae7b71576e91951
• https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a

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