ksmbd: fix sd_ndr.data memory leak in ksmbd_vfs_set_sd_xattr (CVE-2026-93812) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93812

ksmbd: fix sd_ndr.data memory leak in ksmbd_vfs_set_sd_xattr

Answer in brief

CVE-2026-93812 records a Unknown severity vulnerability in ksmbd: fix sd_ndr.data memory leak in ksmbd_vfs_set_sd_xattr. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b4dec75498fd0a1c9eaea680aef59c9519eb16f \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c521dd78e036b5e0cfd394dd2ff2218890dd9e41 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d4d56b00c7df88cd5751e7415bdfabc9fdbc82a7 \|\| >=0 <6.12.111 \|\| >=0 <6.18.53	9b4dec75498fd0a1c9eaea680aef59c9519eb16f, c521dd78e036b5e0cfd394dd2ff2218890dd9e41, d4d56b00c7df88cd5751e7415bdfabc9fdbc82a7, 6.12.111, 6.18.53

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux.
Review the reported fix. Update Linux/Linux to 9b4dec75498fd0a1c9eaea680aef59c9519eb16f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix sd_ndr.data memory leak in ksmbd_vfs_set_sd_xattr ndr_encode_v4_ntacl() allocates sd_ndr.data via kzalloc() at entry. If any subsequent ndr_write_*() call returns error during encoding, the allocated sd_ndr.data won't be freed and causes memory leak. Move kfree(sd_ndr.data) into out label to ensure the buffer gets released on all success and error return paths.

Quoted source text, attributed separately from HOL analysis.