CVE-2026-68098

ksmbd: bound DACL dedup walk to copied ACEs

State: Published
Severity: 8.8 High
Published: Aug 10, 2026
Updated: Oct 30, 2026
Reserved: Jul 30, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: bound DACL dedup walk to copied ACEs

set_ntacl_dacl() can stop copying ACEs before consuming the full input DACL when size accounting overflows.

When that happens, num_aces reflects only the ACEs that were actually copied into the output DACL, but set_posix_acl_entries_dacl() still receives nt_num_aces and uses it to walk the existing ACE array during dedup.

That makes the dedup walk scan past the copied ACE array and inspect buffer tail that does not contain valid ACEs.

Split the two meanings currently carried by the NT ACE count. Pass the number of copied NT ACEs to bound the dedup walk, and preserve the original "input DACL had NT ACEs" state separately for the Everyone/default ACL fallback.

This keeps the dedup walk aligned with the ACEs that are actually present in the rebuilt DACL.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
LinuxLinux	e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 05aa552bd69a96e090cbd45656e18cdc46524e20Affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 6d9d7aa4a2c99c31acfa28921c30b684110cf66cAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b057a851129c6a084e7e393b62ca3abf6c2660bcAffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before f1eba60db813ec28732bf18b5f0a67ebac9c3100Affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3Affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 58d97fcd0bf1aee694e244cc28635b9df95b543bAffected
LinuxLinux	5.15Affected before 5.15Not affected 6.1.191 through 6.1.Not affected 6.6.148 through 6.6.Not affected 6.12.101 through 6.12.Not affected 6.18.42 through 6.18.Not affected 7.1.6 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 05aa552bd69a96e090cbd45656e18cdc46524e20Affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 6d9d7aa4a2c99c31acfa28921c30b684110cf66cAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before b057a851129c6a084e7e393b62ca3abf6c2660bcAffected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before f1eba60db813ec28732bf18b5f0a67ebac9c3100Affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3Affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 to before 58d97fcd0bf1aee694e244cc28635b9df95b543bAffected

LinuxLinux

5.15Affected
before 5.15Not affected
6.1.191 through 6.1.*Not affected
6.6.148 through 6.6.*Not affected
6.12.101 through 6.12.*Not affected
6.18.42 through 6.18.*Not affected
7.1.6 through 7.1.*Not affected
7.2 and laterNot affected

References

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