CVE-2026-93786

ksmbd: preserve VFS inherited POSIX ACL mask

CVE-2026-93786 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-93786, released September 24, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.1

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0034

27th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
linux · Debian 13.5 (trixie)	6.12.111-1	DEBIAN-CVE-2026-93786	Sep 24, 2026
linux · Debian 14	7.2.6-1	DEBIAN-CVE-2026-93786	Sep 24, 2026
linux-6.12 · Debian 12.15 (bookworm)	6.12.111-1~deb12u1	DEBIAN-CVE-2026-93786	Sep 24, 2026

Details

Published
September 24, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93786

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