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CVE-2026-93786

ksmbd: preserve VFS inherited POSIX ACL mask

HIGH
8.1
CVSS Score
Published: September 24, 2026 at 04:02 PM UTC
Updated: October 3, 2026 at 11:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.1
Exploit prediction
EPSS 0.3%

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
5.15 ≤ v < 6.12.1115.15 ≤ v < 6.18.535.15 ≤ v < 6.6.1585.15 ≤ v < 7.25.15f44158485826c076335d6860d35872271a83791d
Vendor states this is fixed in 0093909becbda22b62b39b654dbc607faed59cd0 (fixed)
Vendor states this is fixed in 4a19bb1c45667f5a5f6eff9cf6648e0f692d046f (fixed)
Vendor states this is fixed in 591acf171644de590cda245fd8595b473a1beb70 (fixed)
Vendor states this is fixed in e148e567a9252643baa125cb65d7ae9c2c6cf68a (fixed)
Vendor states this is fixed in 5.15 (unaffected)
Vendor states this is fixed in 6.12.111 (unaffected)
Vendor states this is fixed in 6.18.53 (unaffected)
Vendor states this is fixed in 6.6.158 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

Source: cverecord
https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70
Source: cverecord
https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0
Source: cverecord
https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a
Source: cverecord
https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f

CVSS

8.1HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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