ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling (CVE-2026-93811) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93811

ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling

Answer in brief

CVE-2026-93811 records a Unknown severity vulnerability in ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling. 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 <c3836f55e0dab96314774215e12d87f63fa919f2 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e6329322ad733c5b23555c609353841560b26bc \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d708a36634bb7b6f94d0e76d587d2ec50b2b93b5 \|\| >=0 <6.12.111 \|\| >=0 <6.18.53	c3836f55e0dab96314774215e12d87f63fa919f2, 6e6329322ad733c5b23555c609353841560b26bc, d708a36634bb7b6f94d0e76d587d2ec50b2b93b5, 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 c3836f55e0dab96314774215e12d87f63fa919f2 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 acl.sd_buf memory leak and invalid sd_size error handling 1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data which only freed n.data, skipping kfree(acl.sd_buf) and leaking the buffer. Zero-initialize struct xattr_ntacl acl, reorder error labels to out_free to release acl.sd_buf on all error paths. 2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code returned success without freeing sd_buf and left stale *pntsd. Set rc = -EINVAL before jumping to out_free to return error code and free buffer.

Quoted source text, attributed separately from HOL analysis.