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CVE-2026-31709 is an insufficient DACL validation vulnerability in the Linux kernel SMB client's cifsacl functionality. During chmod/chown security-descriptor rebuilding, build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied offset. Existing checks validate only the ACL header, leaving the body and its declared ACE count insufficiently checked. A malicious SMB server can return a truncated DACL with a valid header that claims one or more ACEs, causing replace_sids_and_copy_aces() or set_chmod_dacl() to compare or copy ACE data beyond the validated extent. The vulnerability can cause kernel memory-safety failures, with potential information disclosure or denial of service.
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An insufficient bounds-validation vulnerability in the Linux kernel SMB/CIFS client. During chmod/chown security-descriptor rebuilding, a malicious server can supply a truncated discretionary access control list (DACL) whose claimed access control entries (ACEs) cause out-of-bounds access. The fix validates the entire DACL and each ACE before parsing or rewriting. The advisory reports a CVSS v3 base score of 7.8.
A Linux kernel SMB client vulnerability in cifsacl involving validation of the whole DACL before rewriting it.
A Linux kernel SMB client cifsacl input-validation flaw where a malicious SMB server can supply a malformed DACL with inconsistent ACE counts, causing out-of-bounds read/copy and memory corruption that may lead to information disclosure or denial of service.
Linux kernel SMB client vulnerability in cifsacl related to validating the whole DACL before rewriting it.
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Cross-references every affected SKU, including bundled OEM variants.
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