CVE-2026-68098High· 8.8▾ TwilightIn 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 happ…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.4%
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.
Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 6d9d7aa4a2c99c31acfa28921c30b684110cf66cLinux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < b057a851129c6a084e7e393b62ca3abf6c2660bcLinux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < f1eba60db813ec28732bf18b5f0a67ebac9c3100Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < a0ebdaa79e10210d4e8ed9fe138e8f4d569719e3Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 58d97fcd0bf1aee694e244cc28635b9df95b543bLinux 5.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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